Removes dead links.

translations/README-ar.md

@@ -1304,7 +1304,6 @@ Supplemental:
 - [Mathematics for Topcoders](https://www.topcoder.com/community/competitive-programming/tutorials/mathematics-for-topcoders/)
 - [Dynamic Programming – From Novice to Advanced](https://www.topcoder.com/community/competitive-programming/tutorials/dynamic-programming-from-novice-to-advanced/)
 - [MIT Interview Materials](https://web.archive.org/web/20160906124824/http://courses.csail.mit.edu/iap/interview/materials.php)
-- [Exercises for getting better at a given language](http://exercism.io/languages)
 
 **Read and Do Programming Problems (in this order):**
 

translations/README-bn.md

@@ -593,12 +593,8 @@
    -  বিবরণ:
        -[অ্যারে (ভিডিও)] (https://www.coursera.org/learn/data-structures/ নির্বাচন //sBSF/arrays)
        -[ইউসি বার্কলে সিএস 61 বি-লিনিয়ার এবং মাল্টি-ডিম অ্যারে (ভিডিও)] (https://archive.org/details/ucberkeley_webcast_Wp8oiO_CZZE) (15m 32s থেকে দেখা শুরু করুন)
-       -[বেসিক অ্যারে (ভিডিও)] (https://archive.org/details/0102WhatYouShouldKnow/02_04-basicArrays.mp4)
-       -[একাধিক ম্লান (ভিডিও)] (https://archive.org/details/0102What youShouldKnow/02_05-মাল্টিডিমাইশনাল অ্যারাই.এমপি 4)
        -[ডাইনামিক অ্যারে (ভিডিও)] (https://www.coursera.org/learn/data-structures/lecture/EwbnV/dynamic-arrays)
        -[জেগড অ্যারে (ভিডিও)] (https://www.youtube.com/watch?v=1jtrQqYpt7g)
-       -[জেগড অ্যারে (ভিডিও)] (https://archive.org/details/0102WhatYouShouldKnow/02_06-জ্যাজডআরাই.আরএম 4)
-       -[পুনরায় আকার দেওয়ার অ্যারে (ভিডিও)] (https://archive.org/details/0102WhatYouShouldKnow/03_01-resizableArrays.mp4)
    -  একটি ভেক্টর প্রয়োগ করুন (স্বয়ংক্রিয় আকার পুনরায় আকারের সাথে পরিবর্তনীয় অ্যারে):
        -  অ্যারে এবং পয়েন্টার ব্যবহার করে কোডিং অনুশীলন করুন, এবং সূচক ব্যবহারের পরিবর্তে সূচীতে ঝাঁপ দেওয়ার জন্য পয়েন্টার ম্যাথ th
        -  বরাদ্দ মেমরি সহ নতুন কাঁচা ডেটা অ্যারে
@@ -661,14 +657,11 @@
  
 -###স্ট্যাক
    -  [স্ট্যাকস (ভিডিও)] (https://www.coursera.org/learn/data-structures/lecture/UdKzQ/stacks)
-   -  [সর্বশেষে প্রথম-আউট স্ট্যাকগুলি ব্যবহার করে (ভিডিও)] (https://archive.org/details/0102WhatYouShouldKnow/05_01-Stacks forLast-inFirst-out.mp4)
    - ] বাস্তবায়ন করবে না। অ্যারের সাথে প্রয়োগ করা তুচ্ছ।
  
 -###কিউ
-   -  [প্রথম সারিতে প্রথম সারিতে ক্যু ব্যবহার করে (ভিডিও)] (https://archive.org/details/0102WhatYouShouldKnow/05_03-usingQueuesForFirst-inFirst-out.mp4)
    -  [সারি (ভিডিও)] (https://www.coursera.org/lecture/data-structures/queues-EShpq)
    -  [বিজ্ঞপ্তি বাফার / ফিফো] (https://en.wikedia.org/wiki/Circular_buffer)
-   -  [অগ্রাধিকারের সারি (ভিডিও)] (https://archive.org/details/0102WhatYouShouldKnav/05_04-priorityQueuesAndDeques.mp4)
    -  লেজ পয়েন্টার সহ লিঙ্কযুক্ত-তালিকা ব্যবহার করে প্রয়োগ করুন:
        -এনকুই (মান)-লেজের স্থানে মান যোগ করে
        -ডেকিউ ()-মান ফেরত দেয় এবং সর্বশেষে যুক্ত হওয়া উপাদান (সামনে) সরিয়ে দেয়
@@ -695,10 +688,6 @@
        -  [(উন্নত) পারফেক্ট হ্যাশিং (ভিডিও)] (https://www.youtube.com/watch?v=N0COwN14gt0&list=PL2B4EEWKD-NbwZ4ezj7gyc_3yNrojKM9&index=4)
  
    -  অনলাইন কোর্স:
-       -  [হ্যাশ ফাংশনগুলি বোঝার (ভিডিও)] (https://archive.org/details/0102WhatYouShouldKnow/06_02-বোঝা হ্যাশফুনেশন.এমপি 4)
-       -  [হ্যাশ টেবিলগুলি (ভিডিও) ব্যবহার করে] (https://archive.org/details/0102WhatYouShouldKnow/06_03-USHashTables.mp4)
-       -  [হ্যাশিং (ভিডিও) সমর্থন করে] (https://archive.org/details/0102WhatYouShouldKnow/06_04-SupportingHashing.mp4)
-       -  [ভাষা সমর্থন হ্যাশ টেবিলগুলি (ভিডিও)] (https://archive.org/details/0102WhatYouShouldKnow/06_05-languageSupportForHashTables.mp4)
        -  [কোর হ্যাশ টেবিল (ভিডিও)] (https://www.coursera.org/learn/data-structures-optimizing-performance/lecture/m7UuP/core-hash-tables)
        -  [ডেটা স্ট্রাকচার (ভিডিও)] (https://www.coursera.org/learn/data-structures/home/week/3)
        -  [ফোন বুক সমস্যা (ভিডিও)] (https://www.coursera.org/learn/data-structures/ নির্বাচন / NYZZP/ iPhone-book-সমস্যা)
@@ -1429,8 +1418,7 @@
 -[টপকোডারদের জন্য গণিত] (https://www.topcoder.com / সম্প্রদায় / কমপিটিটিভ-প্রোগ্রামিং / টিউটোরিয়ালস / ম্যাথেমেটিক্সের জন্য-ট্যাপকোডার /)
 -[ডায়নামিক প্রোগ্রামিং-নোভাইস থেকে অ্যাডভান্সড] (https://www.topcoder.com/commune/competitive-pogramming/tutorials/dynamic-programming-from-novice-to-advanced/
 -[এমআইটি সাক্ষাত্কার উপকরণ] (https://web.archive.org/web/20160906124824/http://courses.csail.mit.edu/iap/interview/matorys.php)
--[প্রদত্ত ভাষায় আরও ভাল হওয়ার জন্য অনুশীলন] (http://exercism.io/languages)
- 
+
 ** প্রোগ্রামিং সমস্যাগুলি পড়ুন এবং করুন (এই ক্রমে): **
  
 -  [প্রোগ্রামিং সাক্ষাত্কার উন্মোচিত: আপনার পরবর্তী কাজ ল্যান্ডিংয়ের গোপনীয়তা, ২ য় সংস্করণ] (http://www.wiley.com/WileyCDA/WileyTitle/productCd-047012167X.html)

translations/README-cn.md

@@ -479,12 +479,8 @@
     - [ ] 介绍：
         - [数组（视频）](https://www.coursera.org/learn/data-structures/lecture/OsBSF/arrays)
         - [UC Berkeley CS61B - 线性数组和多维数组（视频）](https://archive.org/details/ucberkeley_webcast_Wp8oiO_CZZE)（从15分32秒开始）
-        - [数组的基础知识（视频）](https://archive.org/details/0102WhatYouShouldKnow/02_04-basicArrays.mp4)
-        - [多维数组（视频）](https://archive.org/details/0102WhatYouShouldKnow/02_05-multidimensionalArrays.mp4)
         - [动态数组（视频）](https://www.coursera.org/learn/data-structures/lecture/EwbnV/dynamic-arrays)
         - [不规则数组（视频）](https://www.youtube.com/watch?v=1jtrQqYpt7g)
-        - [不规则数组（视频）](https://archive.org/details/0102WhatYouShouldKnow/02_06-jaggedArrays.mp4)
-        - [调整数组的大小（视频）](https://archive.org/details/0102WhatYouShouldKnow/03_01-resizableArrays.mp4)
     - [ ] 实现一个动态数组（可自动调整大小的可变数组）：
         - [ ] 练习使用数组和指针去编码，并且指针是通过计算去跳转而不是使用索引
         - [ ] 通过分配内存来新建一个原生数据型数组
@@ -544,14 +540,11 @@
 
 - ### 堆栈（Stack）
     - [ ] [堆栈（视频）](https://www.coursera.org/learn/data-structures/lecture/UdKzQ/stacks)
-    - [ ] [使用堆栈 —— 后进先出（视频）](https://archive.org/details/0102WhatYouShouldKnow/05_01-usingStacksForLast-inFirst-out.mp4)
     - [ ] 可以不实现，因为使用数组来实现并不重要
 
 - ### 队列（Queue）
-    - [ ] [使用队列 —— 先进先出（视频）](https://archive.org/details/0102WhatYouShouldKnow/05_03-usingQueuesForFirst-inFirst-out.mp4)
     - [ ] [队列（视频）](https://www.coursera.org/learn/data-structures/lecture/EShpq/queue)
     - [ ] [原型队列/先进先出（FIFO）](https://en.wikipedia.org/wiki/Circular_buffer)
-    - [ ] [优先级队列（视频）](https://archive.org/details/0102WhatYouShouldKnow/05_04-priorityQueuesAndDeques.mp4)
     - [ ] 使用含有尾部指针的链表来实现:
         - enqueue(value) —— 在尾部添加值
         - dequeue() —— 删除最早添加的元素并返回其值（首部元素）
@@ -577,10 +570,6 @@
         - [ ] [（进阶）完美哈希（Perfect hashing）（视频）](https://www.youtube.com/watch?v=N0COwN14gt0&list=PL2B4EEwhKD-NbwZ4ezj7gyc_3yNrojKM9&index=4)
 
     - [ ] 在线课程：
-        - [ ] [理解哈希函数（视频）](https://archive.org/details/0102WhatYouShouldKnow/06_02-understandingHashFunctions.mp4)
-        - [ ] [使用哈希表（视频）](https://archive.org/details/0102WhatYouShouldKnow/06_03-usingHashTables.mp4)
-        - [ ] [支持哈希（视频）](https://archive.org/details/0102WhatYouShouldKnow/06_04-supportingHashing.mp4)
-        - [ ] [哈希表的语言支持（视频）](https://archive.org/details/0102WhatYouShouldKnow/06_05-languageSupportForHashTables.mp4)
         - [ ] [基本哈希表（视频）](https://www.coursera.org/learn/data-structures-optimizing-performance/lecture/m7UuP/core-hash-tables)
         - [ ] [数据结构（视频）](https://www.coursera.org/learn/data-structures/home/week/3)
         - [ ] [电话薄问题（Phone Book Problem）（视频）](https://www.coursera.org/learn/data-structures/lecture/NYZZP/phone-book-problem)
@@ -1235,7 +1224,6 @@
 - [Topcoder的数学](https://www.topcoder.com/community/competitive-programming/tutorials/mathematics-for-topcoders/)
 - [动态编程──从新手到高级](https://www.topcoder.com/community/competitive-programming/tutorials/dynamic-programming-from-novice-to-advanced/)
 - [MIT 面试材料](https://web.archive.org/web/20160906124824/http://courses.csail.mit.edu/iap/interview/materials.php)
-- [练习以掌握特定语言](http://exercism.io/languages)
 
 **阅读并练习编程问题（按此顺序）**：
 

translations/README-de.md

@@ -593,12 +593,8 @@ Schreib Code auf einer Tafel oder auf Papier, aber nicht am Computer. Teste mit
     - [ ] Beschreibung:
         - [Arrays (video)](https://www.coursera.org/learn/data-structures/lecture/OsBSF/arrays)
         - [UC Berkeley CS61B - Linear and Multi-Dim Arrays (video)](https://archive.org/details/ucberkeley_webcast_Wp8oiO_CZZE) (Start watching from 15m 32s)
-        - [Basic Arrays (video)](https://archive.org/details/0102WhatYouShouldKnow/02_04-basicArrays.mp4)
-        - [Multi-dim (video)](https://archive.org/details/0102WhatYouShouldKnow/02_05-multidimensionalArrays.mp4)
         - [Dynamic Arrays (video)](https://www.coursera.org/learn/data-structures/lecture/EwbnV/dynamic-arrays)
         - [Jagged Arrays (video)](https://www.youtube.com/watch?v=1jtrQqYpt7g)
-        - [Jagged Arrays (video)](https://archive.org/details/0102WhatYouShouldKnow/02_06-jaggedArrays.mp4)
-        - [Resizing arrays (video)](https://archive.org/details/0102WhatYouShouldKnow/03_01-resizableArrays.mp4)
     - [ ] Implementiere ein Vektor (veränderbares Array, das automatisch seine Größe verändert):
         - [ ] Übe Arrays und Pointer (Zeiger) zu coden, und benutze Pointerberechnung, um ein Element aus einem Array auszuwählen statt den Index zu benutzen.
         - [ ] neues Rohdaten-Array mit allokierten Speicher
@@ -661,14 +657,11 @@ Schreib Code auf einer Tafel oder auf Papier, aber nicht am Computer. Teste mit
 
 - ### Stack (Stapel)
     - [ ] [Stacks (video)](https://www.coursera.org/learn/data-structures/lecture/UdKzQ/stacks)
-    - [ ] [Using Stacks Last-In First-Out (video)](https://archive.org/details/0102WhatYouShouldKnow/05_01-usingStacksForLast-inFirst-out.mp4)
     - [ ] Werde ich nicht implementieren. Implementierung mittels Array ist trivial.
 
 - ### Queue (Warteschlangen)
-    - [ ] [Using Queues First-In First-Out(video)](https://archive.org/details/0102WhatYouShouldKnow/05_03-usingQueuesForFirst-inFirst-out.mp4)
     - [ ] [Queue (video)](https://www.coursera.org/lecture/data-structures/queues-EShpq)
     - [ ] [Circular buffer/FIFO](https://en.wikipedia.org/wiki/Circular_buffer)
-    - [ ] [Priority Queues (video)](https://archive.org/details/0102WhatYouShouldKnow/05_04-priorityQueuesAndDeques.mp4)
     - [ ] Implementierung mittels verketteten Listen, mit Tail-Pointer:
         - enqueue(value) - fügt Wert am Ende ein
         - dequeue() - gibt das älteste Element (am Anfang der Liste) zurück und löscht es
@@ -695,10 +688,6 @@ Schreib Code auf einer Tafel oder auf Papier, aber nicht am Computer. Teste mit
         - [ ] [(Advanced) Perfect hashing (video)](https://www.youtube.com/watch?v=N0COwN14gt0&list=PL2B4EEwhKD-NbwZ4ezj7gyc_3yNrojKM9&index=4)
 
     - [ ] Online Kurse:
-        - [ ] [Understanding Hash Functions (video)](https://archive.org/details/0102WhatYouShouldKnow/06_02-understandingHashFunctions.mp4)
-        - [ ] [Using Hash Tables (video)](https://archive.org/details/0102WhatYouShouldKnow/06_03-usingHashTables.mp4)
-        - [ ] [Supporting Hashing (video)](https://archive.org/details/0102WhatYouShouldKnow/06_04-supportingHashing.mp4)
-        - [ ] [Language Support Hash Tables (video)](https://archive.org/details/0102WhatYouShouldKnow/06_05-languageSupportForHashTables.mp4)
         - [ ] [Core Hash Tables (video)](https://www.coursera.org/learn/data-structures-optimizing-performance/lecture/m7UuP/core-hash-tables)
         - [ ] [Data Structures (video)](https://www.coursera.org/learn/data-structures/home/week/3)
         - [ ] [Phone Book Problem (video)](https://www.coursera.org/learn/data-structures/lecture/NYZZP/phone-book-problem)
@@ -1430,7 +1419,6 @@ Zusatz:
 - [Mathematics for Topcoders](https://www.topcoder.com/community/competitive-programming/tutorials/mathematics-for-topcoders/)
 - [Dynamic Programming – From Novice to Advanced](https://www.topcoder.com/community/competitive-programming/tutorials/dynamic-programming-from-novice-to-advanced/)
 - [MIT Interview Materials](https://web.archive.org/web/20160906124824/http://courses.csail.mit.edu/iap/interview/materials.php)
-- [Exercises for getting better at a given language](http://exercism.io/languages)
 
 **Lese und löse Programmieraufgaben (in dieser Reihenfolge):**
 

translations/README-es.md

@@ -209,7 +209,6 @@ Si desea ser un Ingeniero de Escalabilidad/Seguridad o un Ingeniero de Sistemas,
     - [Árboles k-D](#árboles-k-d)
     - [Lista por saltos](#listas-por-saltos)
     - [Flujos de red](#flujos-de-red)
-    - [Conjuntos disjuntos & Encontrar unión](#conjuntos-disjuntos-encontrar-unión)
     - [Matemáticas para procesamiento rápido](#matemáticas-para-procesamiento-rápido)
     - [Treap](#treap)
     - [Programación Lineal](#programación-lineal)
@@ -562,12 +561,8 @@ Escriba código en un pizarrón o en papel, pero no en la computadora. Pruebe co
     - [ ] Descripción:
         - [Arrays (video)](https://www.coursera.org/learn/data-structures/lecture/OsBSF/arrays)
         - [UCBerkley CS61B - Linear and Multi-Dim Arrays (video)](https://youtu.be/Wp8oiO_CZZE?t=15m32s)
-        - [Basic Arrays (video)](https://archive.org/details/0102WhatYouShouldKnow/02_04-basicArrays.mp4)
-        - [Multi-dim (video)](https://archive.org/details/0102WhatYouShouldKnow/02_05-multidimensionalArrays.mp4)
         - [Dynamic Arrays (video)](https://www.coursera.org/learn/data-structures/lecture/EwbnV/dynamic-arrays)
         - [Jagged Arrays (video)](https://www.youtube.com/watch?v=1jtrQqYpt7g)
-        - [Jagged Arrays (video)](https://archive.org/details/0102WhatYouShouldKnow/02_06-jaggedArrays.mp4)
-        - [Resizing arrays (video)](https://archive.org/details/0102WhatYouShouldKnow/03_01-resizableArrays.mp4)
     - [ ] Implemente un vector (Arreglo mutable con redimensionamiento automático):
         - [ ] Practique codificar usando arreglos y apuntadores, y un apuntador matemático para saltar a un índice en lugar de utilizar la indexación.
         - [ ] Nuevo arreglo de información primaria con memoria asignada.
@@ -628,14 +623,11 @@ Escriba código en un pizarrón o en papel, pero no en la computadora. Pruebe co
         - No es necesario.
 - ### Pila:
     - [ ] [Stacks (video)](https://www.coursera.org/learn/data-structures/lecture/UdKzQ/stacks)
-    - [ ] [Using Stacks Last-In First-Out (video)](https://archive.org/details/0102WhatYouShouldKnow/05_01-usingStacksForLast-inFirst-out.mp4)
     - [ ] No implementaré. Implementando con arreglos es trivial.
 
 - ### Cola o fila
-    - [ ] [Using Queues First-In First-Out(video)](https://archive.org/details/0102WhatYouShouldKnow/05_03-usingQueuesForFirst-inFirst-out.mp4)
     - [ ] [Queue (video)](https://www.coursera.org/learn/data-structures/lecture/EShpq/queue)
     - [ ] [Circular buffer/FIFO](https://en.wikipedia.org/wiki/Circular_buffer)
-    - [ ] [Priority Queues (video)](https://archive.org/details/0102WhatYouShouldKnow/05_04-priorityQueuesAndDeques.mp4)
     - [ ] Implementar usando listas enlazadas, con el puntero de la cola:
         - enqueue(value) – Añade el valor en la posición de la cola.
         - dequeue() – Regresa el valor y elimina el valor más recientemente añadido(frontal)
@@ -661,10 +653,6 @@ Escriba código en un pizarrón o en papel, pero no en la computadora. Pruebe co
         - [ ] [(Advanced) Perfect hashing (video)](https://www.youtube.com/watch?v=N0COwN14gt0&list=PL2B4EEwhKD-NbwZ4ezj7gyc_3yNrojKM9&index=4)
 
     - [ ] Cursos en línea:
-        - [ ] [Understanding Hash Functions (video)](https://archive.org/details/0102WhatYouShouldKnow/06_02-understandingHashFunctions.mp4)
-        - [ ] [Using Hash Tables (video)](https://archive.org/details/0102WhatYouShouldKnow/06_03-usingHashTables.mp4)
-        - [ ] [Supporting Hashing (video)](https://archive.org/details/0102WhatYouShouldKnow/06_04-supportingHashing.mp4)
-        - [ ] [Language Support Hash Tables (video)](https://archive.org/details/0102WhatYouShouldKnow/06_05-languageSupportForHashTables.mp4)
         - [ ] [Core Hash Tables (video)](https://www.coursera.org/learn/data-structures-optimizing-performance/lecture/m7UuP/core-hash-tables)
         - [ ] [Data Structures (video)](https://www.coursera.org/learn/data-structures/home/week/3)
         - [ ] [Phone Book Problem (video)](https://www.coursera.org/learn/data-structures/lecture/NYZZP/phone-book-problem)
@@ -811,25 +799,6 @@ Escriba código en un pizarrón o en papel, pero no en la computadora. Pruebe co
 
 - Para ordenamientos por montículos, vea la estructura de datos de Colas o filas arriba. El ordenamiento por montículos es estupendo, pero inestable.
 
-- [ ] [Sedgewick - Mergesort (5 videos)](https://www.youtube.com/watch?v=4nKwesx_c8E&list=PLe-ggMe31CTeunC6GZHFBmQx7EKtjbGf9)
-    - [ ] [1. Mergesort](https://www.youtube.com/watch?v=4nKwesx_c8E&list=PLe-ggMe31CTeunC6GZHFBmQx7EKtjbGf9&index=1)
-    - [ ] [2. Bottom up Mergesort](https://www.youtube.com/watch?v=HGOIGUYjeyk&list=PLe-ggMe31CTeunC6GZHFBmQx7EKtjbGf9&index=2)
-    - [ ] [3. Sorting Complexity](https://www.youtube.com/watch?v=WvU_mIWo0Ac&index=3&list=PLe-ggMe31CTeunC6GZHFBmQx7EKtjbGf9)
-    - [ ] [4. Comparators](https://www.youtube.com/watch?v=7MvC1kmBza0&index=4&list=PLe-ggMe31CTeunC6GZHFBmQx7EKtjbGf9)
-    - [ ] [5. Stability](https://www.youtube.com/watch?v=XD_5iINB5GI&index=5&list=PLe-ggMe31CTeunC6GZHFBmQx7EKtjbGf9)
-
-- [ ] [Sedgewick - Quicksort (4 videos)](https://www.youtube.com/playlist?list=PLe-ggMe31CTeE3x2-nF1-toca1QpuXwE1)
-    - [ ] [1. Quicksort](https://www.youtube.com/watch?v=5M5A7qPWk84&index=1&list=PLe-ggMe31CTeE3x2-nF1-toca1QpuXwE1)
-    - [ ] [2. Selection](https://www.youtube.com/watch?v=CgVYfSyct_M&index=2&list=PLe-ggMe31CTeE3x2-nF1-toca1QpuXwE1)
-    - [ ] [3. Duplicate Keys](https://www.youtube.com/watch?v=WBFzOYJ5ybM&index=3&list=PLe-ggMe31CTeE3x2-nF1-toca1QpuXwE1)
-    - [ ] [4. System Sorts](https://www.youtube.com/watch?v=rejpZ2htBjE&index=4&list=PLe-ggMe31CTeE3x2-nF1-toca1QpuXwE1)
-
-- [ ] UC Berkeley:
-    - [ ] [CS 61B Lecture 29: Sorting I (video)](https://www.youtube.com/watch?v=EiUvYS2DT6I&list=PL4BBB74C7D2A1049C&index=29)
-    - [ ] [CS 61B Lecture 30: Sorting II (video)](https://www.youtube.com/watch?v=2hTY3t80Qsk&list=PL4BBB74C7D2A1049C&index=30)
-    - [ ] [CS 61B Lecture 32: Sorting III (video)](https://www.youtube.com/watch?v=Y6LOLpxg6Dc&index=32&list=PL4BBB74C7D2A1049C)
-    - [ ] [CS 61B Lecture 33: Sorting V (video)](https://www.youtube.com/watch?v=qNMQ4ly43p4&index=33&list=PL4BBB74C7D2A1049C)
-
 - [ ] [Bubble Sort (video)](https://www.youtube.com/watch?v=P00xJgWzz2c&index=1&list=PL89B61F78B552C1AB)
 - [ ] [Analyzing Bubble Sort (video)](https://www.youtube.com/watch?v=ni_zk257Nqo&index=7&list=PL89B61F78B552C1AB)
 - [ ] [Insertion Sort, Merge Sort (video)](https://www.youtube.com/watch?v=Kg4bqzAqRBM&index=3&list=PLUl4u3cNGP61Oq3tWYp6V_F-5jb5L2iHb)
@@ -1345,32 +1314,6 @@ Es bueno si quieres repasar frecuentemente.
     - [Videos](https://www.youtube.com/watch?v=r4r1DZcx1cM&list=PLmVb1OknmNJuC5POdcDv5oCS7_OUkDgpj&index=22)
 - [ ] Series de videos cortos sobre temas de 2-5 minutos - Michael Sambol (18 videos):
     - [Videos](https://www.youtube.com/channel/UCzDJwLWoYCUQowF_nG3m5OQ)
-- [ ] [Sedgewick Videos - Algorithms I](https://www.youtube.com/user/algorithmscourses/playlists?shelf_id=2&view=50&sort=dd)
-    - [ ] [01. Union-Find](https://www.youtube.com/watch?v=8mYfZeHtdNc&list=PLe-ggMe31CTexoNYnMhbHaWhQ0dvcy43t)
-    - [ ] [02. Analysis of Algorithms](https://www.youtube.com/watch?v=ZN-nFW0mEpg&list=PLe-ggMe31CTf0_bkOhh7sa5uqeppp3Sr0)
-    - [ ] [03. Stacks and Queues](https://www.youtube.com/watch?v=TIC1gappbP8&list=PLe-ggMe31CTe-9jhnj3P_3mmrCh0A7iHh)
-    - [ ] [04. Elementary Sorts](https://www.youtube.com/watch?v=CD2AL6VO0ak&list=PLe-ggMe31CTe_5WhGV0F--7CK8MoRUqBd)
-    - [ ] [05. Mergesort](https://www.youtube.com/watch?v=4nKwesx_c8E&list=PLe-ggMe31CTeunC6GZHFBmQx7EKtjbGf9)
-    - [ ] [06. Quicksort](https://www.youtube.com/watch?v=5M5A7qPWk84&list=PLe-ggMe31CTeE3x2-nF1-toca1QpuXwE1)
-    - [ ] [07. Priority Queues](https://www.youtube.com/watch?v=G9TMe0KC0w0&list=PLe-ggMe31CTducy9LDiGVkdSv0NfiRwn5)
-    - [ ] [08. Elementary Symbol Tables](https://www.youtube.com/watch?v=up_nlilw3ac&list=PLe-ggMe31CTc3a8nKRDxFZZrWrBvkc9SG)
-    - [ ] [09. Balanced Search Trees](https://www.youtube.com/watch?v=qC1BLLPK_5w&list=PLe-ggMe31CTf7jHH_mFT50kayjCEA6Rhu)
-    - [ ] [10. Geometric Applications of BST](https://www.youtube.com/watch?v=Wl30aGAp6TY&list=PLe-ggMe31CTdBsRIw0hXln0hilRs-DqAx)
-    - [ ] [11. Hash Tables](https://www.youtube.com/watch?v=QA8fJGO-i9o&list=PLe-ggMe31CTcKxIRGqqThMts2eHtSrf11)
-- [ ] [Sedgewick Videos - Algorithms II](https://www.youtube.com/user/algorithmscourses/playlists?flow=list&shelf_id=3&view=50)
-    - [ ] [01. Undirected Graphs](https://www.youtube.com/watch?v=GmVhD-mmMBg&list=PLe-ggMe31CTc0zDzANxl4I2MhMoRVlbRM)
-    - [ ] [02. Directed Graphs](https://www.youtube.com/watch?v=_z-JsVaUS40&list=PLe-ggMe31CTcEwaU8a1P1Gd95A77HV85K)
-    - [ ] [03. Minimum Spanning Trees](https://www.youtube.com/watch?v=t8fNk9tfVYY&list=PLe-ggMe31CTceUZxDesGfHGLE7kcSafqj)
-    - [ ] [04. Shortest Paths](https://www.youtube.com/watch?v=HoGSiB7tSeI&list=PLe-ggMe31CTePpG3jbeOTsnGUGZDKxgZD)
-    - [ ] [05. Maximum Flow](https://www.youtube.com/watch?v=rYIKlFstBqE&list=PLe-ggMe31CTduQ68XQ-sVj32wYJIspTma)
-    - [ ] [06. Radix Sorts](https://www.youtube.com/watch?v=HKPrVm5FWvg&list=PLe-ggMe31CTcNvUX9E3tQeM6ntrdR8e53)
-    - [ ] [07. Tries](https://www.youtube.com/watch?v=00YaFPcC65g&list=PLe-ggMe31CTe9IyG9MB8vt5xUJeYgOYRQ)
-    - [ ] [08. Substring Search](https://www.youtube.com/watch?v=QzI0p6zDjK4&list=PLe-ggMe31CTdAdjXB3lIuf2maubzo9t66)
-    - [ ] [09. Regular Expressions](https://www.youtube.com/watch?v=TQWNQsJSPnk&list=PLe-ggMe31CTetTlJWouM42fyttyKPgSDh)
-    - [ ] [10. Data Compression](https://www.youtube.com/watch?v=at9tjpxcBh8&list=PLe-ggMe31CTciifRRo6yY0Yt0mzgIXXVZ)
-    - [ ] [11. Reductions](https://www.youtube.com/watch?v=Ow5x-ooMGv8&list=PLe-ggMe31CTe_yliW5vc3yO-dj1LSSDyF)
-    - [ ] [12. Linear Programming](https://www.youtube.com/watch?v=rWhcLyiLZLA&list=PLe-ggMe31CTdy6dKzMgkWFuTTN1H8B-E1)
-    - [ ] [13. Intractability](https://www.youtube.com/watch?v=6qcaaDp4cdQ&list=PLe-ggMe31CTcZCjluBHw53e_ek2k9Kn-S)
 
 ---
 
@@ -1398,7 +1341,6 @@ Complementarios:
 - [Mathematics for Topcoders](https://www.topcoder.com/community/data-science/data-science-tutorials/mathematics-for-topcoders/)
 - [Dynamic Programming – From Novice to Advanced](https://www.topcoder.com/community/data-science/data-science-tutorials/dynamic-programming-from-novice-to-advanced/)
 - [MIT Interview Materials](https://web.archive.org/web/20160906124824/http://courses.csail.mit.edu/iap/interview/materials.php)
-- [Exercises for getting better at a given language](http://exercism.io/languages)
 
 **Lea y haga problemas de programación (en ese orden):**
 
@@ -1763,10 +1705,6 @@ Es probable que estos temas no aparezcan en una entrevista, pero los añadí par
     - [ ] [Ford-Fulkerson Algorithm (video)](https://www.youtube.com/watch?v=v1VgJmkEJW0)
     - [ ] [Network Flows (video)](https://www.youtube.com/watch?v=2vhN4Ice5jI)
 
-- ### Conjuntos disjuntos & Encontrar unión
-    - [ ] [UCB 61B - Disjoint Sets; Sorting & selection (video)](https://www.youtube.com/watch?v=MAEGXTwmUsI&list=PL-XXv-cvA_iAlnI-BQr9hjqADPBtujFJd&index=21)
-    - [ ] [Sedgewick Algorithms - Union-Find (6 videos)](https://www.youtube.com/watch?v=8mYfZeHtdNc&list=PLe-ggMe31CTexoNYnMhbHaWhQ0dvcy43t)
-
 - ### Matemáticas para procesamiento rápido
     - [ ] [Integer Arithmetic, Karatsuba Multiplication (video)](https://www.youtube.com/watch?v=eCaXlAaN2uE&index=11&list=PLUl4u3cNGP61Oq3tWYp6V_F-5jb5L2iHb)
     - [ ] [The Chinese Remainder Theorem (used in cryptography) (video)](https://www.youtube.com/watch?v=ru7mWZJlRQg)

translations/README-fr.md

@@ -170,7 +170,6 @@ Si vous souhaitez devenir ingénieur de fiabilité, ou ingénieur systèmes, sui
     - [k-D Trees](#k-d-trees)
     - [Skip lists](#skip-lists)
     - [Network Flows](#network-flows)
-    - [Disjoint Sets & Union Find](#disjoint-sets--union-find)
     - [Math for Fast Processing](#math-for-fast-processing)
     - [Treap](#treap)
     - [Linear Programming](#linear-programming)
@@ -599,12 +598,8 @@ Write code on a whiteboard or paper, not a computer. Test with some sample input
     - [ ] Description:
         - [Arrays (video)](https://www.coursera.org/learn/data-structures/lecture/OsBSF/arrays)
         - [UCBerkley CS61B - Linear and Multi-Dim Arrays (video)](https://youtu.be/Wp8oiO_CZZE?t=15m32s)
-        - [Basic Arrays (video)](https://archive.org/details/0102WhatYouShouldKnow/02_04-basicArrays.mp4)
-        - [Multi-dim (video)](https://archive.org/details/0102WhatYouShouldKnow/02_05-multidimensionalArrays.mp4)
         - [Dynamic Arrays (video)](https://www.coursera.org/learn/data-structures/lecture/EwbnV/dynamic-arrays)
         - [Jagged Arrays (video)](https://www.youtube.com/watch?v=1jtrQqYpt7g)
-        - [Jagged Arrays (video)](https://archive.org/details/0102WhatYouShouldKnow/02_06-jaggedArrays.mp4)
-        - [Resizing arrays (video)](https://archive.org/details/0102WhatYouShouldKnow/03_01-resizableArrays.mp4)
     - [ ] Implement a vector (mutable array with automatic resizing):
         - [ ] Practice coding using arrays and pointers, and pointer math to jump to an index instead of using indexing.
         - [ ] new raw data array with allocated memory
@@ -666,14 +661,11 @@ Write code on a whiteboard or paper, not a computer. Test with some sample input
 
 - ### Stack
     - [ ] [Stacks (video)](https://www.coursera.org/learn/data-structures/lecture/UdKzQ/stacks)
-    - [ ] [Using Stacks Last-In First-Out (video)](https://archive.org/details/0102WhatYouShouldKnow/05_01-usingStacksForLast-inFirst-out.mp4)
     - [ ] Will not implement. Implementing with array is trivial.
 
 - ### Queue
-    - [ ] [Using Queues First-In First-Out(video)](https://archive.org/details/0102WhatYouShouldKnow/05_03-usingQueuesForFirst-inFirst-out.mp4)
     - [ ] [Queue (video)](https://www.coursera.org/learn/data-structures/lecture/EShpq/queue)
     - [ ] [Circular buffer/FIFO](https://en.wikipedia.org/wiki/Circular_buffer)
-    - [ ] [Priority Queues (video)](https://archive.org/details/0102WhatYouShouldKnow/05_04-priorityQueuesAndDeques.mp4)
     - [ ] Implement using linked-list, with tail pointer:
         - enqueue(value) - adds value at position at tail
         - dequeue() - returns value and removes least recently added element (front)
@@ -700,10 +692,6 @@ Write code on a whiteboard or paper, not a computer. Test with some sample input
         - [ ] [(Advanced) Perfect hashing (video)](https://www.youtube.com/watch?v=N0COwN14gt0&list=PL2B4EEwhKD-NbwZ4ezj7gyc_3yNrojKM9&index=4)
 
     - [ ] Online Courses:
-        - [ ] [Understanding Hash Functions (video)](https://archive.org/details/0102WhatYouShouldKnow/06_02-understandingHashFunctions.mp4)
-        - [ ] [Using Hash Tables (video)](https://archive.org/details/0102WhatYouShouldKnow/06_03-usingHashTables.mp4)
-        - [ ] [Supporting Hashing (video)](https://archive.org/details/0102WhatYouShouldKnow/06_04-supportingHashing.mp4)
-        - [ ] [Language Support Hash Tables (video)](https://archive.org/details/0102WhatYouShouldKnow/06_05-languageSupportForHashTables.mp4)
         - [ ] [Core Hash Tables (video)](https://www.coursera.org/learn/data-structures-optimizing-performance/lecture/m7UuP/core-hash-tables)
         - [ ] [Data Structures (video)](https://www.coursera.org/learn/data-structures/home/week/3)
         - [ ] [Phone Book Problem (video)](https://www.coursera.org/learn/data-structures/lecture/NYZZP/phone-book-problem)
@@ -853,25 +841,6 @@ Write code on a whiteboard or paper, not a computer. Test with some sample input
 
 - For heapsort, see Heap data structure above. Heap sort is great, but not stable.
 
-- [ ] [Sedgewick - Mergesort (5 videos)](https://www.youtube.com/watch?v=4nKwesx_c8E&list=PLe-ggMe31CTeunC6GZHFBmQx7EKtjbGf9)
-    - [ ] [1. Mergesort](https://www.youtube.com/watch?v=4nKwesx_c8E&list=PLe-ggMe31CTeunC6GZHFBmQx7EKtjbGf9&index=1)
-    - [ ] [2. Bottom up Mergesort](https://www.youtube.com/watch?v=HGOIGUYjeyk&list=PLe-ggMe31CTeunC6GZHFBmQx7EKtjbGf9&index=2)
-    - [ ] [3. Sorting Complexity](https://www.youtube.com/watch?v=WvU_mIWo0Ac&index=3&list=PLe-ggMe31CTeunC6GZHFBmQx7EKtjbGf9)
-    - [ ] [4. Comparators](https://www.youtube.com/watch?v=7MvC1kmBza0&index=4&list=PLe-ggMe31CTeunC6GZHFBmQx7EKtjbGf9)
-    - [ ] [5. Stability](https://www.youtube.com/watch?v=XD_5iINB5GI&index=5&list=PLe-ggMe31CTeunC6GZHFBmQx7EKtjbGf9)
-
-- [ ] [Sedgewick - Quicksort (4 videos)](https://www.youtube.com/playlist?list=PLe-ggMe31CTeE3x2-nF1-toca1QpuXwE1)
-    - [ ] [1. Quicksort](https://www.youtube.com/watch?v=5M5A7qPWk84&index=1&list=PLe-ggMe31CTeE3x2-nF1-toca1QpuXwE1)
-    - [ ] [2. Selection](https://www.youtube.com/watch?v=CgVYfSyct_M&index=2&list=PLe-ggMe31CTeE3x2-nF1-toca1QpuXwE1)
-    - [ ] [3. Duplicate Keys](https://www.youtube.com/watch?v=WBFzOYJ5ybM&index=3&list=PLe-ggMe31CTeE3x2-nF1-toca1QpuXwE1)
-    - [ ] [4. System Sorts](https://www.youtube.com/watch?v=rejpZ2htBjE&index=4&list=PLe-ggMe31CTeE3x2-nF1-toca1QpuXwE1)
-
-- [ ] UC Berkeley:
-    - [ ] [CS 61B Lecture 29: Sorting I (video)](https://www.youtube.com/watch?v=EiUvYS2DT6I&list=PL4BBB74C7D2A1049C&index=29)
-    - [ ] [CS 61B Lecture 30: Sorting II (video)](https://www.youtube.com/watch?v=2hTY3t80Qsk&list=PL4BBB74C7D2A1049C&index=30)
-    - [ ] [CS 61B Lecture 32: Sorting III (video)](https://www.youtube.com/watch?v=Y6LOLpxg6Dc&index=32&list=PL4BBB74C7D2A1049C)
-    - [ ] [CS 61B Lecture 33: Sorting V (video)](https://www.youtube.com/watch?v=qNMQ4ly43p4&index=33&list=PL4BBB74C7D2A1049C)
-
 - [ ] [Bubble Sort (video)](https://www.youtube.com/watch?v=P00xJgWzz2c&index=1&list=PL89B61F78B552C1AB)
 - [ ] [Analyzing Bubble Sort (video)](https://www.youtube.com/watch?v=ni_zk257Nqo&index=7&list=PL89B61F78B552C1AB)
 - [ ] [Insertion Sort, Merge Sort (video)](https://www.youtube.com/watch?v=Kg4bqzAqRBM&index=3&list=PLUl4u3cNGP61Oq3tWYp6V_F-5jb5L2iHb)
@@ -1315,32 +1284,6 @@ You'll get more graph practice in Skiena's book (see Books section below) and th
     - [Videos](https://www.youtube.com/watch?v=r4r1DZcx1cM&list=PLmVb1OknmNJuC5POdcDv5oCS7_OUkDgpj&index=22)
 - [ ] Series of 2-5 minutes short subject videos - Michael Sambol (18 videos):
     - [Videos](https://www.youtube.com/channel/UCzDJwLWoYCUQowF_nG3m5OQ)
-- [ ] [Sedgewick Videos - Algorithms I](https://www.youtube.com/user/algorithmscourses/playlists?shelf_id=2&view=50&sort=dd)
-    - [ ] [01. Union-Find](https://www.youtube.com/watch?v=8mYfZeHtdNc&list=PLe-ggMe31CTexoNYnMhbHaWhQ0dvcy43t)
-    - [ ] [02. Analysis of Algorithms](https://www.youtube.com/watch?v=ZN-nFW0mEpg&list=PLe-ggMe31CTf0_bkOhh7sa5uqeppp3Sr0)
-    - [ ] [03. Stacks and Queues](https://www.youtube.com/watch?v=TIC1gappbP8&list=PLe-ggMe31CTe-9jhnj3P_3mmrCh0A7iHh)
-    - [ ] [04. Elementary Sorts](https://www.youtube.com/watch?v=CD2AL6VO0ak&list=PLe-ggMe31CTe_5WhGV0F--7CK8MoRUqBd)
-    - [ ] [05. Mergesort](https://www.youtube.com/watch?v=4nKwesx_c8E&list=PLe-ggMe31CTeunC6GZHFBmQx7EKtjbGf9)
-    - [ ] [06. Quicksort](https://www.youtube.com/watch?v=5M5A7qPWk84&list=PLe-ggMe31CTeE3x2-nF1-toca1QpuXwE1)
-    - [ ] [07. Priority Queues](https://www.youtube.com/watch?v=G9TMe0KC0w0&list=PLe-ggMe31CTducy9LDiGVkdSv0NfiRwn5)
-    - [ ] [08. Elementary Symbol Tables](https://www.youtube.com/watch?v=up_nlilw3ac&list=PLe-ggMe31CTc3a8nKRDxFZZrWrBvkc9SG)
-    - [ ] [09. Balanced Search Trees](https://www.youtube.com/watch?v=qC1BLLPK_5w&list=PLe-ggMe31CTf7jHH_mFT50kayjCEA6Rhu)
-    - [ ] [10. Geometric Applications of BST](https://www.youtube.com/watch?v=Wl30aGAp6TY&list=PLe-ggMe31CTdBsRIw0hXln0hilRs-DqAx)
-    - [ ] [11. Hash Tables](https://www.youtube.com/watch?v=QA8fJGO-i9o&list=PLe-ggMe31CTcKxIRGqqThMts2eHtSrf11)
-- [ ] [Sedgewick Videos - Algorithms II](https://www.youtube.com/user/algorithmscourses/playlists?flow=list&shelf_id=3&view=50)
-    - [ ] [01. Undirected Graphs](https://www.youtube.com/watch?v=GmVhD-mmMBg&list=PLe-ggMe31CTc0zDzANxl4I2MhMoRVlbRM)
-    - [ ] [02. Directed Graphs](https://www.youtube.com/watch?v=_z-JsVaUS40&list=PLe-ggMe31CTcEwaU8a1P1Gd95A77HV85K)
-    - [ ] [03. Minimum Spanning Trees](https://www.youtube.com/watch?v=t8fNk9tfVYY&list=PLe-ggMe31CTceUZxDesGfHGLE7kcSafqj)
-    - [ ] [04. Shortest Paths](https://www.youtube.com/watch?v=HoGSiB7tSeI&list=PLe-ggMe31CTePpG3jbeOTsnGUGZDKxgZD)
-    - [ ] [05. Maximum Flow](https://www.youtube.com/watch?v=rYIKlFstBqE&list=PLe-ggMe31CTduQ68XQ-sVj32wYJIspTma)
-    - [ ] [06. Radix Sorts](https://www.youtube.com/watch?v=HKPrVm5FWvg&list=PLe-ggMe31CTcNvUX9E3tQeM6ntrdR8e53)
-    - [ ] [07. Tries](https://www.youtube.com/watch?v=00YaFPcC65g&list=PLe-ggMe31CTe9IyG9MB8vt5xUJeYgOYRQ)
-    - [ ] [08. Substring Search](https://www.youtube.com/watch?v=QzI0p6zDjK4&list=PLe-ggMe31CTdAdjXB3lIuf2maubzo9t66)
-    - [ ] [09. Regular Expressions](https://www.youtube.com/watch?v=TQWNQsJSPnk&list=PLe-ggMe31CTetTlJWouM42fyttyKPgSDh)
-    - [ ] [10. Data Compression](https://www.youtube.com/watch?v=at9tjpxcBh8&list=PLe-ggMe31CTciifRRo6yY0Yt0mzgIXXVZ)
-    - [ ] [11. Reductions](https://www.youtube.com/watch?v=Ow5x-ooMGv8&list=PLe-ggMe31CTe_yliW5vc3yO-dj1LSSDyF)
-    - [ ] [12. Linear Programming](https://www.youtube.com/watch?v=rWhcLyiLZLA&list=PLe-ggMe31CTdy6dKzMgkWFuTTN1H8B-E1)
-    - [ ] [13. Intractability](https://www.youtube.com/watch?v=6qcaaDp4cdQ&list=PLe-ggMe31CTcZCjluBHw53e_ek2k9Kn-S)
 
 ---
 
@@ -1375,7 +1318,6 @@ Supplemental:
 - [Mathematics for Topcoders](https://www.topcoder.com/community/data-science/data-science-tutorials/mathematics-for-topcoders/)
 - [Dynamic Programming – From Novice to Advanced](https://www.topcoder.com/community/data-science/data-science-tutorials/dynamic-programming-from-novice-to-advanced/)
 - [MIT Interview Materials](https://web.archive.org/web/20160906124824/http://courses.csail.mit.edu/iap/interview/materials.php)
-- [Exercises for getting better at a given language](http://exercism.io/languages)
 
 **Read and Do Programming Problems (in this order):**
 
@@ -1830,10 +1772,6 @@ You're never really done.
     - [ ] [Ford-Fulkerson Algorithm (video)](https://www.youtube.com/watch?v=v1VgJmkEJW0)
     - [ ] [Network Flows (video)](https://www.youtube.com/watch?v=2vhN4Ice5jI)
 
-- ### Disjoint Sets & Union Find
-    - [ ] [UCB 61B - Disjoint Sets; Sorting & selection (video)](https://www.youtube.com/watch?v=MAEGXTwmUsI&list=PL-XXv-cvA_iAlnI-BQr9hjqADPBtujFJd&index=21)
-    - [ ] [Sedgewick Algorithms - Union-Find (6 videos)](https://www.youtube.com/watch?v=8mYfZeHtdNc&list=PLe-ggMe31CTexoNYnMhbHaWhQ0dvcy43t)
-
 - ### Math for Fast Processing
     - [ ] [Integer Arithmetic, Karatsuba Multiplication (video)](https://www.youtube.com/watch?v=eCaXlAaN2uE&index=11&list=PLUl4u3cNGP61Oq3tWYp6V_F-5jb5L2iHb)
     - [ ] [The Chinese Remainder Theorem (used in cryptography) (video)](https://www.youtube.com/watch?v=ru7mWZJlRQg)

translations/README-he.md

@@ -172,7 +172,6 @@
     - [k-D Trees](#k-d-trees)
     - [Skip lists](#skip-lists)
     - [Network Flows](#network-flows)
-    - [Disjoint Sets & Union Find](#disjoint-sets--union-find)
     - [Math for Fast Processing](#math-for-fast-processing)
     - [Treap](#treap)
     - [Linear Programming](#linear-programming)
@@ -613,13 +612,8 @@ Write code on a whiteboard or paper, not a computer. Test with some sample input
     - Implement an automatically resizing vector.
     - [ ] Description:
         - [Arrays (video)](https://www.coursera.org/learn/data-structures/lecture/OsBSF/arrays)
-        - [UCBerkley CS61B - Linear and Multi-Dim Arrays (video)](https://youtu.be/Wp8oiO_CZZE?t=15m32s)
-        - [Basic Arrays (video)](https://archive.org/details/0102WhatYouShouldKnow/02_04-basicArrays.mp4)
-        - [Multi-dim (video)](https://archive.org/details/0102WhatYouShouldKnow/02_05-multidimensionalArrays.mp4)
         - [Dynamic Arrays (video)](https://www.coursera.org/learn/data-structures/lecture/EwbnV/dynamic-arrays)
         - [Jagged Arrays (video)](https://www.youtube.com/watch?v=1jtrQqYpt7g)
-        - [Jagged Arrays (video)](https://archive.org/details/0102WhatYouShouldKnow/02_06-jaggedArrays.mp4)
-        - [Resizing arrays (video)](https://archive.org/details/0102WhatYouShouldKnow/03_01-resizableArrays.mp4)
     - [ ] Implement a vector (mutable array with automatic resizing):
         - [ ] Practice coding using arrays and pointers, and pointer math to jump to an index instead of using indexing.
         - [ ] new raw data array with allocated memory
@@ -681,14 +675,11 @@ Write code on a whiteboard or paper, not a computer. Test with some sample input
 
 - ### Stack
     - [ ] [Stacks (video)](https://www.coursera.org/learn/data-structures/lecture/UdKzQ/stacks)
-    - [ ] [Using Stacks Last-In First-Out (video)](https://archive.org/details/0102WhatYouShouldKnow/05_01-usingStacksForLast-inFirst-out.mp4)
     - [ ] Will not implement. Implementing with array is trivial.
 
 - ### Queue
-    - [ ] [Using Queues First-In First-Out(video)](https://archive.org/details/0102WhatYouShouldKnow/05_03-usingQueuesForFirst-inFirst-out.mp4)
     - [ ] [Queue (video)](https://www.coursera.org/learn/data-structures/lecture/EShpq/queue)
     - [ ] [Circular buffer/FIFO](https://en.wikipedia.org/wiki/Circular_buffer)
-    - [ ] [Priority Queues (video)](https://archive.org/details/0102WhatYouShouldKnow/05_04-priorityQueuesAndDeques.mp4)
     - [ ] Implement using linked-list, with tail pointer:
         - enqueue(value) - adds value at position at tail
         - dequeue() - returns value and removes least recently added element (front)
@@ -715,10 +706,6 @@ Write code on a whiteboard or paper, not a computer. Test with some sample input
         - [ ] [(Advanced) Perfect hashing (video)](https://www.youtube.com/watch?v=N0COwN14gt0&list=PL2B4EEwhKD-NbwZ4ezj7gyc_3yNrojKM9&index=4)
 
     - [ ] Online Courses:
-        - [ ] [Understanding Hash Functions (video)](https://archive.org/details/0102WhatYouShouldKnow/06_02-understandingHashFunctions.mp4)
-        - [ ] [Using Hash Tables (video)](https://archive.org/details/0102WhatYouShouldKnow/06_03-usingHashTables.mp4)
-        - [ ] [Supporting Hashing (video)](https://archive.org/details/0102WhatYouShouldKnow/06_04-supportingHashing.mp4)
-        - [ ] [Language Support Hash Tables (video)](https://archive.org/details/0102WhatYouShouldKnow/06_05-languageSupportForHashTables.mp4)
         - [ ] [Core Hash Tables (video)](https://www.coursera.org/learn/data-structures-optimizing-performance/lecture/m7UuP/core-hash-tables)
         - [ ] [Data Structures (video)](https://www.coursera.org/learn/data-structures/home/week/3)
         - [ ] [Phone Book Problem (video)](https://www.coursera.org/learn/data-structures/lecture/NYZZP/phone-book-problem)
@@ -868,25 +855,6 @@ Write code on a whiteboard or paper, not a computer. Test with some sample input
 
 - For heapsort, see Heap data structure above. Heap sort is great, but not stable.
 
-- [ ] [Sedgewick - Mergesort (5 videos)](https://www.youtube.com/watch?v=4nKwesx_c8E&list=PLe-ggMe31CTeunC6GZHFBmQx7EKtjbGf9)
-    - [ ] [1. Mergesort](https://www.youtube.com/watch?v=4nKwesx_c8E&list=PLe-ggMe31CTeunC6GZHFBmQx7EKtjbGf9&index=1)
-    - [ ] [2. Bottom up Mergesort](https://www.youtube.com/watch?v=HGOIGUYjeyk&list=PLe-ggMe31CTeunC6GZHFBmQx7EKtjbGf9&index=2)
-    - [ ] [3. Sorting Complexity](https://www.youtube.com/watch?v=WvU_mIWo0Ac&index=3&list=PLe-ggMe31CTeunC6GZHFBmQx7EKtjbGf9)
-    - [ ] [4. Comparators](https://www.youtube.com/watch?v=7MvC1kmBza0&index=4&list=PLe-ggMe31CTeunC6GZHFBmQx7EKtjbGf9)
-    - [ ] [5. Stability](https://www.youtube.com/watch?v=XD_5iINB5GI&index=5&list=PLe-ggMe31CTeunC6GZHFBmQx7EKtjbGf9)
-
-- [ ] [Sedgewick - Quicksort (4 videos)](https://www.youtube.com/playlist?list=PLe-ggMe31CTeE3x2-nF1-toca1QpuXwE1)
-    - [ ] [1. Quicksort](https://www.youtube.com/watch?v=5M5A7qPWk84&index=1&list=PLe-ggMe31CTeE3x2-nF1-toca1QpuXwE1)
-    - [ ] [2. Selection](https://www.youtube.com/watch?v=CgVYfSyct_M&index=2&list=PLe-ggMe31CTeE3x2-nF1-toca1QpuXwE1)
-    - [ ] [3. Duplicate Keys](https://www.youtube.com/watch?v=WBFzOYJ5ybM&index=3&list=PLe-ggMe31CTeE3x2-nF1-toca1QpuXwE1)
-    - [ ] [4. System Sorts](https://www.youtube.com/watch?v=rejpZ2htBjE&index=4&list=PLe-ggMe31CTeE3x2-nF1-toca1QpuXwE1)
-
-- [ ] UC Berkeley:
-    - [ ] [CS 61B Lecture 29: Sorting I (video)](https://www.youtube.com/watch?v=EiUvYS2DT6I&list=PL4BBB74C7D2A1049C&index=29)
-    - [ ] [CS 61B Lecture 30: Sorting II (video)](https://www.youtube.com/watch?v=2hTY3t80Qsk&list=PL4BBB74C7D2A1049C&index=30)
-    - [ ] [CS 61B Lecture 32: Sorting III (video)](https://www.youtube.com/watch?v=Y6LOLpxg6Dc&index=32&list=PL4BBB74C7D2A1049C)
-    - [ ] [CS 61B Lecture 33: Sorting V (video)](https://www.youtube.com/watch?v=qNMQ4ly43p4&index=33&list=PL4BBB74C7D2A1049C)
-
 - [ ] [Bubble Sort (video)](https://www.youtube.com/watch?v=P00xJgWzz2c&index=1&list=PL89B61F78B552C1AB)
 - [ ] [Analyzing Bubble Sort (video)](https://www.youtube.com/watch?v=ni_zk257Nqo&index=7&list=PL89B61F78B552C1AB)
 - [ ] [Insertion Sort, Merge Sort (video)](https://www.youtube.com/watch?v=Kg4bqzAqRBM&index=3&list=PLUl4u3cNGP61Oq3tWYp6V_F-5jb5L2iHb)
@@ -1330,32 +1298,6 @@ You'll get more graph practice in Skiena's book (see Books section below) and th
     - [Videos](https://www.youtube.com/watch?v=r4r1DZcx1cM&list=PLmVb1OknmNJuC5POdcDv5oCS7_OUkDgpj&index=22)
 - [ ] Series of 2-5 minutes short subject videos - Michael Sambol (18 videos):
     - [Videos](https://www.youtube.com/channel/UCzDJwLWoYCUQowF_nG3m5OQ)
-- [ ] [Sedgewick Videos - Algorithms I](https://www.youtube.com/user/algorithmscourses/playlists?shelf_id=2&view=50&sort=dd)
-    - [ ] [01. Union-Find](https://www.youtube.com/watch?v=8mYfZeHtdNc&list=PLe-ggMe31CTexoNYnMhbHaWhQ0dvcy43t)
-    - [ ] [02. Analysis of Algorithms](https://www.youtube.com/watch?v=ZN-nFW0mEpg&list=PLe-ggMe31CTf0_bkOhh7sa5uqeppp3Sr0)
-    - [ ] [03. Stacks and Queues](https://www.youtube.com/watch?v=TIC1gappbP8&list=PLe-ggMe31CTe-9jhnj3P_3mmrCh0A7iHh)
-    - [ ] [04. Elementary Sorts](https://www.youtube.com/watch?v=CD2AL6VO0ak&list=PLe-ggMe31CTe_5WhGV0F--7CK8MoRUqBd)
-    - [ ] [05. Mergesort](https://www.youtube.com/watch?v=4nKwesx_c8E&list=PLe-ggMe31CTeunC6GZHFBmQx7EKtjbGf9)
-    - [ ] [06. Quicksort](https://www.youtube.com/watch?v=5M5A7qPWk84&list=PLe-ggMe31CTeE3x2-nF1-toca1QpuXwE1)
-    - [ ] [07. Priority Queues](https://www.youtube.com/watch?v=G9TMe0KC0w0&list=PLe-ggMe31CTducy9LDiGVkdSv0NfiRwn5)
-    - [ ] [08. Elementary Symbol Tables](https://www.youtube.com/watch?v=up_nlilw3ac&list=PLe-ggMe31CTc3a8nKRDxFZZrWrBvkc9SG)
-    - [ ] [09. Balanced Search Trees](https://www.youtube.com/watch?v=qC1BLLPK_5w&list=PLe-ggMe31CTf7jHH_mFT50kayjCEA6Rhu)
-    - [ ] [10. Geometric Applications of BST](https://www.youtube.com/watch?v=Wl30aGAp6TY&list=PLe-ggMe31CTdBsRIw0hXln0hilRs-DqAx)
-    - [ ] [11. Hash Tables](https://www.youtube.com/watch?v=QA8fJGO-i9o&list=PLe-ggMe31CTcKxIRGqqThMts2eHtSrf11)
-- [ ] [Sedgewick Videos - Algorithms II](https://www.youtube.com/user/algorithmscourses/playlists?flow=list&shelf_id=3&view=50)
-    - [ ] [01. Undirected Graphs](https://www.youtube.com/watch?v=GmVhD-mmMBg&list=PLe-ggMe31CTc0zDzANxl4I2MhMoRVlbRM)
-    - [ ] [02. Directed Graphs](https://www.youtube.com/watch?v=_z-JsVaUS40&list=PLe-ggMe31CTcEwaU8a1P1Gd95A77HV85K)
-    - [ ] [03. Minimum Spanning Trees](https://www.youtube.com/watch?v=t8fNk9tfVYY&list=PLe-ggMe31CTceUZxDesGfHGLE7kcSafqj)
-    - [ ] [04. Shortest Paths](https://www.youtube.com/watch?v=HoGSiB7tSeI&list=PLe-ggMe31CTePpG3jbeOTsnGUGZDKxgZD)
-    - [ ] [05. Maximum Flow](https://www.youtube.com/watch?v=rYIKlFstBqE&list=PLe-ggMe31CTduQ68XQ-sVj32wYJIspTma)
-    - [ ] [06. Radix Sorts](https://www.youtube.com/watch?v=HKPrVm5FWvg&list=PLe-ggMe31CTcNvUX9E3tQeM6ntrdR8e53)
-    - [ ] [07. Tries](https://www.youtube.com/watch?v=00YaFPcC65g&list=PLe-ggMe31CTe9IyG9MB8vt5xUJeYgOYRQ)
-    - [ ] [08. Substring Search](https://www.youtube.com/watch?v=QzI0p6zDjK4&list=PLe-ggMe31CTdAdjXB3lIuf2maubzo9t66)
-    - [ ] [09. Regular Expressions](https://www.youtube.com/watch?v=TQWNQsJSPnk&list=PLe-ggMe31CTetTlJWouM42fyttyKPgSDh)
-    - [ ] [10. Data Compression](https://www.youtube.com/watch?v=at9tjpxcBh8&list=PLe-ggMe31CTciifRRo6yY0Yt0mzgIXXVZ)
-    - [ ] [11. Reductions](https://www.youtube.com/watch?v=Ow5x-ooMGv8&list=PLe-ggMe31CTe_yliW5vc3yO-dj1LSSDyF)
-    - [ ] [12. Linear Programming](https://www.youtube.com/watch?v=rWhcLyiLZLA&list=PLe-ggMe31CTdy6dKzMgkWFuTTN1H8B-E1)
-    - [ ] [13. Intractability](https://www.youtube.com/watch?v=6qcaaDp4cdQ&list=PLe-ggMe31CTcZCjluBHw53e_ek2k9Kn-S)
 
 ---
 
@@ -1390,7 +1332,6 @@ Supplemental:
 - [Mathematics for Topcoders](https://www.topcoder.com/community/data-science/data-science-tutorials/mathematics-for-topcoders/)
 - [Dynamic Programming – From Novice to Advanced](https://www.topcoder.com/community/data-science/data-science-tutorials/dynamic-programming-from-novice-to-advanced/)
 - [MIT Interview Materials](https://web.archive.org/web/20160906124824/http://courses.csail.mit.edu/iap/interview/materials.php)
-- [Exercises for getting better at a given language](http://exercism.io/languages)
 
 **Read and Do Programming Problems (in this order):**
 
@@ -1846,10 +1787,6 @@ You're never really done.
     - [ ] [Ford-Fulkerson Algorithm (video)](https://www.youtube.com/watch?v=v1VgJmkEJW0)
     - [ ] [Network Flows (video)](https://www.youtube.com/watch?v=2vhN4Ice5jI)
 
-- ### Disjoint Sets & Union Find
-    - [ ] [UCB 61B - Disjoint Sets; Sorting & selection (video)](https://www.youtube.com/watch?v=MAEGXTwmUsI&list=PL-XXv-cvA_iAlnI-BQr9hjqADPBtujFJd&index=21)
-    - [ ] [Sedgewick Algorithms - Union-Find (6 videos)](https://www.youtube.com/watch?v=8mYfZeHtdNc&list=PLe-ggMe31CTexoNYnMhbHaWhQ0dvcy43t)
-
 - ### Math for Fast Processing
     - [ ] [Integer Arithmetic, Karatsuba Multiplication (video)](https://www.youtube.com/watch?v=eCaXlAaN2uE&index=11&list=PLUl4u3cNGP61Oq3tWYp6V_F-5jb5L2iHb)
     - [ ] [The Chinese Remainder Theorem (used in cryptography) (video)](https://www.youtube.com/watch?v=ru7mWZJlRQg)

translations/README-hi.md

@@ -449,11 +449,7 @@ memory" का एरर न दे, और तब मुझे कोई वै
     - एक स्वचालित रीसाइज़िंग वेक्टर को लागू करें
     - [ ] विवरण:
         - [एरे  (विडियो)](https://www.coursera.org/learn/data-structures/lecture/OsBSF/arrays)
-        - [Basic Arrays (विडियो)](https://archive.org/details/0102WhatYouShouldKnow/02_04-basicArrays.mp4)
-        - [Multi-dim (विडियो)](https://archive.org/details/0102WhatYouShouldKnow/02_05-multidimensionalArrays.mp4)
         - [Dynamic Arrays (विडियो)](https://www.coursera.org/learn/data-structures/lecture/EwbnV/dynamic-arrays)
-        - [Jagged Arrays (विडियो)](https://archive.org/details/0102WhatYouShouldKnow/02_06-jaggedArrays.mp4)
-        - [Resizing arrays (विडियो)](https://archive.org/details/0102WhatYouShouldKnow/03_01-resizableArrays.mp4)
     - [ ] Implement a vector (mutable array with automatic resizing):
         - [ ] Practice coding using arrays and pointers, and pointer math to jump to an index instead of using indexing.
         - [ ] new raw data array with allocated memory
@@ -515,14 +511,11 @@ memory" का एरर न दे, और तब मुझे कोई वै
 
 - ### Stack
     - [ ] [Stacks (विडियो)](https://www.coursera.org/learn/data-structures/lecture/UdKzQ/stacks)
-    - [ ] [Using Stacks Last-In First-Out (विडियो)](https://archive.org/details/0102WhatYouShouldKnow/05_01-usingStacksForLast-inFirst-out.mp4)
     - [ ] Will not implement. Implementing with array is trivial.
 
 - ### Queue
-    - [ ] [Using Queues First-In First-Out(विडियो)](https://archive.org/details/0102WhatYouShouldKnow/05_03-usingQueuesForFirst-inFirst-out.mp4)
     - [ ] [Queue (विडियो)](https://www.coursera.org/learn/data-structures/lecture/EShpq/queue)
     - [ ] [Circular buffer/FIFO](https://en.wikipedia.org/wiki/Circular_buffer)
-    - [ ] [Priority Queues (विडियो)](https://archive.org/details/0102WhatYouShouldKnow/05_04-priorityQueuesAndDeques.mp4)
     - [ ] Implement using linked-list, with tail pointer:
         - enqueue(value) - adds value at position at tail
         - dequeue() - returns value and removes least recently added element (front)
@@ -549,10 +542,6 @@ memory" का एरर न दे, और तब मुझे कोई वै
         - [ ] [(Advanced) Perfect hashing (विडियो)](https://www.youtube.com/watch?v=N0COwN14gt0&list=PL2B4EEwhKD-NbwZ4ezj7gyc_3yNrojKM9&index=4)
     
     - [ ] Online Courses:
-        - [ ] [Understanding Hash Functions (विडियो](https://archive.org/details/0102WhatYouShouldKnow/06_02-understandingHashFunctions.mp4)
-        - [ ] [Using Hash Tables (विडियो)](https://archive.org/details/0102WhatYouShouldKnow/06_03-usingHashTables.mp4)
-        - [ ] [Supporting Hashing (विडियो)](https://archive.org/details/0102WhatYouShouldKnow/06_04-supportingHashing.mp4)
-        - [ ] [Language Support Hash Tables (विडियो)](https://archive.org/details/0102WhatYouShouldKnow/06_05-languageSupportForHashTables.mp4)
         - [ ] [Core Hash Tables (विडियो)](https://www.coursera.org/learn/data-structures-optimizing-performance/lecture/m7UuP/core-hash-tables)
         - [ ] [Data Structures (विडियो)](https://www.coursera.org/learn/data-structures/home/week/3)
         - [ ] [Phone Book Problem (विडियो)](https://www.coursera.org/learn/data-structures/lecture/NYZZP/phone-book-problem)
@@ -835,12 +824,6 @@ memory" का एरर न दे, और तब मुझे कोई वै
     - [ ] [lecture begins at 35:00 (विडियो)](https://www.youtube.com/watch?v=q7K9otnzlfE&index=9&list=PLOtl7M3yp-DV69F32zdK7YJcNXpTunF2b)
     - [ ] [lecture begins at 23:50 (विडियो)](https://www.youtube.com/watch?v=TvqIGu9Iupw&list=PLOtl7M3yp-DV69F32zdK7YJcNXpTunF2b&index=10)
 
-- [ ] UC बर्कले:
-    - [ ] [CS 61B Lecture 29: Sorting I (विडियो)](https://www.youtube.com/watch?v=EiUvYS2DT6I&list=PL4BBB74C7D2A1049C&index=29)
-    - [ ] [CS 61B Lecture 30: Sorting II (विडियो)](https://www.youtube.com/watch?v=2hTY3t80Qsk&list=PL4BBB74C7D2A1049C&index=30)
-    - [ ] [CS 61B Lecture 32: Sorting III (विडियो)](https://www.youtube.com/watch?v=Y6LOLpxg6Dc&index=32&list=PL4BBB74C7D2A1049C)
-    - [ ] [CS 61B Lecture 33: Sorting V (विडियो)](https://www.youtube.com/watch?v=qNMQ4ly43p4&index=33&list=PL4BBB74C7D2A1049C)
-
 - [ ] - Merge sort code:
     - [ ] [Using output array](http://www.cs.yale.edu/homes/aspnes/classes/223/examples/sorting/mergesort.c)
     - [ ] [In-place](https://github.com/jwasham/practice-cpp/blob/master/merge_sort/merge_sort.cc)
@@ -1413,8 +1396,6 @@ Take coding challenges every day, as many as you can.
     - [इंटरव्यूकेक](https://www.interviewcake.com/)
     - [इंटरव्यूबिट](https://www.interviewbit.com)
 
-    - [प्रोग्रामिंग लैंग्वेज में सुधार करने के लिए](http://exercism.io/languages)
-
 ## Once you're closer to the interview
 
 - [ ] Cracking The Coding Interview Set 2 (विडियो):

translations/README-id.md

@@ -1244,7 +1244,6 @@ Tambahan:
 - [Matematika untuk Topcoders](https://www.topcoder.com/community/competitive-programming/tutorials/mathematics-for-topcoders/)
 - [Pemrograman Dinamis - Dari Pemula hingga Mahir](https://www.topcoder.com/community/competitive-programming/tutorials/dynamic-programming-from-novice-to-advanced/)
 - [Materi Wawancara MIT](https://web.archive.org/web/20160906124824/http://courses.csail.mit.edu/iap/interview/materials.php)
-- [Latihan untuk menjadi lebih baik pada bahasa tertentu](http://exercism.io/languages)
 
 **Baca dan Lakukan Masalah Pemrograman (dalam urutan ini):**
 

translations/README-ja.md

@@ -717,25 +717,6 @@ Anki形式の私のフラッシュカードデータベース：https://ankiweb.
 
 - ヒープソートについては、上記のヒープデータ構造を参照してください。ヒープソートは素晴らしいですが、安定していません。
 
-- [ ]  [Sedgewick - Mergesort(5ビデオ)](https://www.youtube.com/watch?v=4nKwesx_c8E&list=PLe-ggMe31CTeunC6GZHFBmQx7EKtjbGf9)
-	- [ ]  [1。 マージソート](https://www.youtube.com/watch?v=4nKwesx_c8E&list=PLe-ggMe31CTeunC6GZHFBmQx7EKtjbGf9&index=1)
-	- [ ]  [2。 マージソート・ボトムアップ](https://www.youtube.com/watch?v=HGOIGUYjeyk&list=PLe-ggMe31CTeunC6GZHFBmQx7EKtjbGf9&index=2)
-	- [ ]  [3。複雑さの並べ替え](https://www.youtube.com/watch?v=WvU_mIWo0Ac&index=3&list=PLe-ggMe31CTeunC6GZHFBmQx7EKtjbGf9)
-	- [ ]  [4。コンパレータ](https://www.youtube.com/watch?v=7MvC1kmBza0&index=4&list=PLe-ggMe31CTeunC6GZHFBmQx7EKtjbGf9)
-	- [ ]  [5。安定性](https://www.youtube.com/watch?v=XD_5iINB5GI&index=5&list=PLe-ggMe31CTeunC6GZHFBmQx7EKtjbGf9)
-
-- [ ]  [Sedgewick - Quicksort(4ビデオ)](https://www.youtube.com/playlist?list=PLe-ggMe31CTeE3x2-nF1-toca1QpuXwE1)
-	- [ ]  [1. クイックソート](https://www.youtube.com/watch?v=5M5A7qPWk84&index=1&list=PLe-ggMe31CTeE3x2-nF1-toca1QpuXwE1)
-	- [ ]  [2. 選択](https://www.youtube.com/watch?v=CgVYfSyct_M&index=2&list=PLe-ggMe31CTeE3x2-nF1-toca1QpuXwE1)
-	- [ ]  [3. 重複キー](https://www.youtube.com/watch?v=WBFzOYJ5ybM&index=3&list=PLe-ggMe31CTeE3x2-nF1-toca1QpuXwE1)
-	- [ ]  [4. システムソート](https://www.youtube.com/watch?v=rejpZ2htBjE&index=4&list=PLe-ggMe31CTeE3x2-nF1-toca1QpuXwE1)
-
-- [ ]  UCバークレー：
-	- [ ]  [CS 61B講義29：ソートI(ビデオ)](https://www.youtube.com/watch?v=EiUvYS2DT6I&list=PL4BBB74C7D2A1049C&index=29)
-	- [ ]  [CS 61B講義30：ソートII(ビデオ)](https://www.youtube.com/watch?v=2hTY3t80Qsk&list=PL4BBB74C7D2A1049C&index=30)
-	- [ ]  [CS 61B講義32：ソートIII(ビデオ)](https://www.youtube.com/watch?v=Y6LOLpxg6Dc&index=32&list=PL4BBB74C7D2A1049C)
-	- [ ]  [CS 61B講義33：ソートV(ビデオ)](https://www.youtube.com/watch?v=qNMQ4ly43p4&index=33&list=PL4BBB74C7D2A1049C)
-
 - [ ]  [バブルソート(動画)](https://www.youtube.com/watch?v=P00xJgWzz2c&index=1&list=PL89B61F78B552C1AB)
 - [ ]  [バブルソートの分析(動画)](https://www.youtube.com/watch?v=ni_zk257Nqo&index=7&list=PL89B61F78B552C1AB)
 - [ ]  [挿入ソート、マージソート(動画)](https://www.youtube.com/watch?v=Kg4bqzAqRBM&index=3&list=PLUl4u3cNGP61Oq3tWYp6V_F-5jb5L2iHb)
@@ -1260,32 +1241,6 @@ Skienaの本(下記の書籍の節を参照)と面接の書籍
 	- [動画](https://www.youtube.com/watch?v=r4r1DZcx1cM&list=PLmVb1OknmNJuC5POdcDv5oCS7_OUkDgpj&index=22)
 - [ ] 2〜5分の短編シリーズビデオ - Michael Sambol(18ビデオ)
 	- [動画](https://www.youtube.com/channel/UCzDJwLWoYCUQowF_nG3m5OQ)
-- [ ]  [Sedgewick Videos - アルゴリズムI](https://www.youtube.com/user/algorithmscourses/playlists?shelf_id=2&view=50&sort=dd)
-	- [ ]  [01.Union-Find](https://www.youtube.com/watch?v=8mYfZeHtdNc&list=PLe-ggMe31CTexoNYnMhbHaWhQ0dvcy43t)
-	- [ ]  [02.アルゴリズムの分析](https://www.youtube.com/watch?v=ZN-nFW0mEpg&list=PLe-ggMe31CTf0_bkOhh7sa5uqeppp3Sr0)
-	- [ ]  [03.スタックとキュー](https://www.youtube.com/watch?v=TIC1gappbP8&list=PLe-ggMe31CTe-9jhnj3P_3mmrCh0A7iHh)
-	- [ ]  [04.初級ソート](https://www.youtube.com/watch?v=CD2AL6VO0ak&list=PLe-ggMe31CTe_5WhGV0F--7CK8MoRUqBd)
-	- [ ]  [05. マージソート](https://www.youtube.com/watch?v=4nKwesx_c8E&list=PLe-ggMe31CTeunC6GZHFBmQx7EKtjbGf9)
-	- [ ]  [06. クイックソート](https://www.youtube.com/watch?v=5M5A7qPWk84&list=PLe-ggMe31CTeE3x2-nF1-toca1QpuXwE1)
-	- [ ]  [07.優先度つきキュー](https://www.youtube.com/watch?v=G9TMe0KC0w0&list=PLe-ggMe31CTducy9LDiGVkdSv0NfiRwn5)
-	- [ ]  [08. 基本記号表](https://www.youtube.com/watch?v=up_nlilw3ac&list=PLe-ggMe31CTc3a8nKRDxFZZrWrBvkc9SG)
-	- [ ]  [09. 平衡探索木](https://www.youtube.com/watch?v=qC1BLLPK_5w&list=PLe-ggMe31CTf7jHH_mFT50kayjCEA6Rhu)
-	- [ ]  [10. BSTの幾何学的応用](https://www.youtube.com/watch?v=Wl30aGAp6TY&list=PLe-ggMe31CTdBsRIw0hXln0hilRs-DqAx)
-	- [ ]  [11.ハッシュテーブル](https://www.youtube.com/watch?v=QA8fJGO-i9o&list=PLe-ggMe31CTcKxIRGqqThMts2eHtSrf11)
-- [ ]  [Sedgewick Videos - アルゴリズムII](https://www.youtube.com/user/algorithmscourses/playlists?flow=list&shelf_id=3&view=50)
-	- [ ]  [01.無向グラフ](https://www.youtube.com/watch?v=GmVhD-mmMBg&list=PLe-ggMe31CTc0zDzANxl4I2MhMoRVlbRM)
-	- [ ]  [02. 有向グラフ](https://www.youtube.com/watch?v=_z-JsVaUS40&list=PLe-ggMe31CTcEwaU8a1P1Gd95A77HV85K)
-	- [ ]  [03.最小スパニング木](https://www.youtube.com/watch?v=t8fNk9tfVYY&list=PLe-ggMe31CTceUZxDesGfHGLE7kcSafqj)
-	- [ ]  [04.最短経路](https://www.youtube.com/watch?v=HoGSiB7tSeI&list=PLe-ggMe31CTePpG3jbeOTsnGUGZDKxgZD)
-	- [ ]  [05.最大フロー](https://www.youtube.com/watch?v=rYIKlFstBqE&list=PLe-ggMe31CTduQ68XQ-sVj32wYJIspTma)
-	- [ ]  [06.基数ソート](https://www.youtube.com/watch?v=HKPrVm5FWvg&list=PLe-ggMe31CTcNvUX9E3tQeM6ntrdR8e53)
-	- [ ]  [07.トライ木](https://www.youtube.com/watch?v=00YaFPcC65g&list=PLe-ggMe31CTe9IyG9MB8vt5xUJeYgOYRQ)
-	- [ ]  [08.部分文字列検索](https://www.youtube.com/watch?v=QzI0p6zDjK4&list=PLe-ggMe31CTdAdjXB3lIuf2maubzo9t66)
-	- [ ]  [09.正規表現](https://www.youtube.com/watch?v=TQWNQsJSPnk&list=PLe-ggMe31CTetTlJWouM42fyttyKPgSDh)
-	- [ ]  [10.データ圧縮](https://www.youtube.com/watch?v=at9tjpxcBh8&list=PLe-ggMe31CTciifRRo6yY0Yt0mzgIXXVZ)
-	- [ ]  [11.リダクション](https://www.youtube.com/watch?v=Ow5x-ooMGv8&list=PLe-ggMe31CTe_yliW5vc3yO-dj1LSSDyF)
-	- [ ]  [12.線形プログラミング](https://www.youtube.com/watch?v=rWhcLyiLZLA&list=PLe-ggMe31CTdy6dKzMgkWFuTTN1H8B-E1)
-	- [ ]  [13.難易度](https://www.youtube.com/watch?v=6qcaaDp4cdQ&list=PLe-ggMe31CTcZCjluBHw53e_ek2k9Kn-S)
 
 ---
 
@@ -1317,7 +1272,6 @@ Skienaの本(下記の書籍の節を参照)と面接の書籍
 - [Topcodersの数学](https://www.topcoder.com/community/data-science/data-science-tutorials/mathematics-for-topcoders/)
 - [動的プログラミング - 初心者から上級者まで](https://www.topcoder.com/community/data-science/data-science-tutorials/dynamic-programming-from-novice-to-advanced/)
 - [MIT面接資料](https://web.archive.org/web/20160906124824/http://courses.csail.mit.edu/iap/interview/materials.php)
-- [特定の言語でより良くなるための練習](http://exercism.io/languages)
 
 **プログラミングの問題を読んでやる(この順番で)：**
 
@@ -1757,10 +1711,6 @@ Skienaの本(下記の書籍の節を参照)と面接の書籍
 	- [ ]  [Ford-Fulkersonアルゴリズム(ビデオ)](https://www.youtube.com/watch?v=v1VgJmkEJW0)
 	- [ ]  [ネットワークフロー(動画)](https://www.youtube.com/watch?v=2vhN4Ice5jI)
 
-- ### 分離集合と連合検索
-	- [ ]  [UCB 61B - ばらばらのセット;並べ替えと選択(動画)](https://www.youtube.com/watch?v=MAEGXTwmUsI&list=PL-XXv-cvA_iAlnI-BQr9hjqADPBtujFJd&index=21)
-	- [ ]  [Sedgewickアルゴリズム - Union-Find(6ビデオ)](https://www.youtube.com/watch?v=8mYfZeHtdNc&list=PLe-ggMe31CTexoNYnMhbHaWhQ0dvcy43t)
-
 - ### 高速処理のための数学
 	- [ ]  [整数演算、Karatsuba倍数(ビデオ)](https://www.youtube.com/watch?v=eCaXlAaN2uE&index=11&list=PLUl4u3cNGP61Oq3tWYp6V_F-5jb5L2iHb)
 	- [中国の剰余定理(暗号で使用)(ビデオ)](https://www.youtube.com/watch?v=ru7mWZJlRQg)

translations/README-kh.md

@@ -536,13 +536,9 @@ Data Structure ទាំងអស់ដែលខ្ញុំធ្លាប់
     - អនុវត្តវ៉ិចទ័រប្តូរទំហំដោយស្វ័យប្រវត្តិ។
     - [ ] ការពិពណ៌នា៖
         - [Arrays (វីដេអូ)](https://www.coursera.org/learn/data-structures/lecture/OsBSF/arrays)
-        -[UC Berkeley CS61B - អារេ លីនែអ៊ែរ និង ពហុវិមាត្រ (វីដេអូ)](https://archive.org/details/ucberkeley_webcast_Wp8oiO_CZZE) (ចាប់ផ្តើមមើលចាប់ពី ១៥នាទី ៣២វិនាទី)
-        - [Arrays មូលដ្ឋាន (វីដេអូ)](https://archive.org/details/0102WhatYouShouldKnow/02_04-basicArrays.mp4)
-        - [ពហុវិមាត្រ (វីដេអូ)](https://archive.org/details/0102WhatYouShouldKnow/02_05-multidimensionalArrays.mp4)
+        - [UC Berkeley CS61B - អារេ លីនែអ៊ែរ និង ពហុវិមាត្រ (វីដេអូ)](https://archive.org/details/ucberkeley_webcast_Wp8oiO_CZZE) (ចាប់ផ្តើមមើលចាប់ពី ១៥នាទី ៣២វិនាទី)
         - [Arrays ឌីណាមិចេ (វីដេអូ)](https://www.coursera.org/learn/data-structures/lecture/EwbnV/dynamic-arrays)
         - [Jagged Arrays (វីដេអូ)](https://www.youtube.com/watch?v=1jtrQqYpt7g)
-        - [Jagged Arrays (វីដេអូ)](https://archive.org/details/0102WhatYouShouldKnow/02_06-jaggedArrays.mp4)
-        - [ការប្តូរទំហំ Arrays (វីដេអូ)](https://archive.org/details/0102WhatYouShouldKnow/03_01-resizableArrays.mp4)
     - [ ] អនុវត្តវ៉ិចទ័រ (បំលែង Arrays ដោយប្តូរទំហំស្វ័យប្រវត្តិ)៖
         - [ ] អនុវត្តការសរសេរកូដដោយប្រើArrays និង ទ្រនិចចង្អុល និង គណិតទ្រនិចដើម្បីលោតទៅសន្ទស្សន៍មួយ។
         - [ ] Arrays ទិន្នន័យថ្មីដែលមានអង្គចងចាំបម្រុងទុក
@@ -609,14 +605,11 @@ Data Structure ទាំងអស់ដែលខ្ញុំធ្លាប់
 
 - ### Stack
     - [ ] [Stack (វីដេអូ)](https://www.coursera.org/learn/data-structures/lecture/UdKzQ/stacks)
-    - [ ] [ការប្រើ Stack ចូលមុនចេញក្រោយ (វីដេអូ)](https://archive.org/details/0102WhatYouShouldKnow/05_01-usingStacksForLast-inFirst-out.mp4)
     - [ ] នឹងមិនអនុវត្តទេ។ ការអនុវត្តជាមួយ Array គឺមិនសំខាន់។
 
 - ### Queue
-    - [ ] [ការប្រើ Queue ចូលមុនចេញមុន(វីដេអូ)](https://archive.org/details/0102WhatYouShouldKnow/05_03-usingQueuesForFirst-inFirst-out.mp4)
     - [ ] [Queue (វីដេអូ)](https://www.coursera.org/lecture/data-structures/queues-EShpq)
     - [ ] [Circular buffer/FIFO](https://en.wikipedia.org/wiki/Circular_buffer)
-    - [ ] [Queue អាទិភាព (វីដេអូ)](https://archive.org/details/0102WhatYouShouldKnow/05_04-priorityQueuesAndDeques.mp4)
     - [ ] ប្រើ linked-list ដែលមានភ្ជាប់ជាមួយទ្រនិចនៅកន្ទុយ៖
         - enqueue(តម្លៃ) - បន្ថែមតម្លៃនៅទីតាំងនៅកន្ទុយ
         - dequeue() - ត្រឡប់តម្លៃនិងយកធាតុដែលបានបន្ថែមថ្មីៗចេញ (ផ្នែកខាងមុខ)
@@ -643,10 +636,6 @@ Data Structure ទាំងអស់ដែលខ្ញុំធ្លាប់
         - [ ] [(ជឿនលឿន) Perfect hashing (វីដេអូ)](https://www.youtube.com/watch?v=N0COwN14gt0&list=PL2B4EEwhKD-NbwZ4ezj7gyc_3yNrojKM9&index=4)
 
     - [ ] វគ្គសិក្សាអនឡាញ៖
-        - [ ] [ស្វែងយល់អំពីមុខងារ Hash (វីដេអូ)](https://archive.org/details/0102WhatYouShouldKnow/06_02-understandingHashFunctions.mp4)
-        - [ ] [ការប្រើតារាងHash (វីដេអូ)](https://archive.org/details/0102WhatYouShouldKnow/06_03-usingHashTables.mp4)
-        - [ ] [គាំទ្រ Hash (វីដេអូ)](https://archive.org/details/0102WhatYouShouldKnow/06_04- ឧបត្ថម្ភគាំទ្រហាន់ឌ្រី)
-        - [ ] [តារាងជំនួយភាសា Hash(វីដេអូ)](https://archive.org/details/0102WhatYouShouldKnow/06_05-languageSupportForHashTables.mp4)
         - [ ] [Core Hash Tables (វីដេអូ)](https://www.coursera.org/learn/data-structures-optimizing-performance/lecture/m7UuP/core-hash-tables)
         - [ ] [រចនាសម្ព័ន្ធទិន្នន័យ (វីដេអូ)](https://www.coursera.org/learn/data-structures/home/week/4)
         - [ ] [បញ្ហាសៀវភៅទូរស័ព្ទ (វីដេអូ)](https://www.coursera.org/learn/data-structures/lecture/NYZZP/phone-book-problem)
@@ -1321,7 +1310,6 @@ Graphs អាចត្រូវបានប្រើដើម្បីបង្
 - [Mathematics for Topcoders](https://www.topcoder.com/community/competitive-programming/tutorials/mathematics-for-topcoders/)
 - [Dynamic Programming – From Novice to Advanced](https://www.topcoder.com/community/competitive-programming/tutorials/dynamic-programming-from-novice-to-advanced/)
 - [MIT Interview Materials](https://web.archive.org/web/20160906124824/http://courses.csail.mit.edu/iap/interview/materials.php)
-- [Exercises for getting better at a given language](http://exercism.io/languages)
 
 **អាននិងធ្វើបញ្ហាកម្មវិធី (តាមលំដាប់លំដោយ):**
 

translations/README-ko.md

@@ -568,12 +568,8 @@ Anki 형식의 내 요약집 데이터베이스: https://ankiweb.net/shared/info
   - [ ] 설명:
     - [배열 (영상)](https://www.coursera.org/learn/data-structures/lecture/OsBSF/arrays)
     - [UCBerkley CS61B - 선형과 다차원 배열 (영상)](https://youtu.be/Wp8oiO_CZZE?t=15m32s)
-    - [배열 기본 (영상)](https://archive.org/details/0102WhatYouShouldKnow/02_04-basicArrays.mp4)
-    - [다차원 배열 (영상)](https://archive.org/details/0102WhatYouShouldKnow/02_05-multidimensionalArrays.mp4)
     - [동적 배열 (영상)](https://www.coursera.org/learn/data-structures/lecture/EwbnV/dynamic-arrays)
     - [가변 배열 (영상)](https://www.youtube.com/watch?v=1jtrQqYpt7g)
-    - [가변 배열 (영상)](https://archive.org/details/0102WhatYouShouldKnow/02_06-jaggedArrays.mp4)
-    - [배열 리사이징 (영상)](https://archive.org/details/0102WhatYouShouldKnow/03_01-resizableArrays.mp4)
   - [ ] 벡터 구현하기 (자동 리사이징을 포함한 동적 배열):
     - [ ] 배열, 포인터 및 인덱싱 대신하여 특정 인덱스에 접근하는 포인터 연산을 통한 코딩 연습
     - [ ] 메모리 할당을 포함한 새 배열
@@ -667,10 +663,6 @@ Anki 형식의 내 요약집 데이터베이스: https://ankiweb.net/shared/info
     - [ ] [(Advanced) Perfect hashing (video)](https://www.youtube.com/watch?v=N0COwN14gt0&list=PL2B4EEwhKD-NbwZ4ezj7gyc_3yNrojKM9&index=4)
 
   - [ ] 온라인 강의들:
-    - [ ] [Understanding Hash Functions (video)](https://archive.org/details/0102WhatYouShouldKnow/06_02-understandingHashFunctions.mp4)
-    - [ ] [Using Hash Tables (video)](https://archive.org/details/0102WhatYouShouldKnow/06_03-usingHashTables.mp4)
-    - [ ] [Supporting Hashing (video)](https://archive.org/details/0102WhatYouShouldKnow/06_04-supportingHashing.mp4)
-    - [ ] [Language Support Hash Tables (video)](https://archive.org/details/0102WhatYouShouldKnow/06_05-languageSupportForHashTables.mp4)
     - [ ] [Core Hash Tables (video)](https://www.coursera.org/learn/data-structures-optimizing-performance/lecture/m7UuP/core-hash-tables)
     - [ ] [Data Structures (video)](https://www.coursera.org/learn/data-structures/home/week/3)
     - [ ] [Phone Book Problem (video)](https://www.coursera.org/learn/data-structures/lecture/NYZZP/phone-book-problem)
@@ -1337,7 +1329,6 @@ Skiena의 책(아래의 책 섹션 참조)과 인터뷰 책에서 더 많은 그
 - [Mathematics for Topcoders](https://www.topcoder.com/community/competitive-programming/tutorials/mathematics-for-topcoders/)
 - [Dynamic Programming – From Novice to Advanced](https://www.topcoder.com/community/competitive-programming/tutorials/dynamic-programming-from-novice-to-advanced/)
 - [MIT Interview Materials](https://web.archive.org/web/20160906124824/http://courses.csail.mit.edu/iap/interview/materials.php)
-- [Exercises for getting better at a given language](http://exercism.io/languages)
 
 **읽고 프로그래밍 문제 풀기 (순서대로):**
 

translations/README-pl.md

@@ -521,12 +521,8 @@ Napisz kod na tablicy lub papierze, a nie na komputerze. Testuj z niektórymi pr
     - [ ] Opis:
         - [Arrays (wideo)](https://www.coursera.org/learn/data-structures/lecture/OsBSF/arrays)
         - [UC Berkeley CS61B - Linear and Multi-Dim Arrays (wideo)](https://archive.org/details/ucberkeley_webcast_Wp8oiO_CZZE) (Start watching from 15m 32s)
-        - [Basic Arrays (wideo)](https://archive.org/details/0102WhatYouShouldKnow/02_04-basicArrays.mp4)
-        - [Multi-dim (wideo)](https://archive.org/details/0102WhatYouShouldKnow/02_05-multidimensionalArrays.mp4)
         - [Dynamic Arrays (wideo)](https://www.coursera.org/learn/data-structures/lecture/EwbnV/dynamic-arrays)
         - [Jagged Arrays (wideo)](https://www.youtube.com/watch?v=1jtrQqYpt7g)
-        - [Jagged Arrays (wideo)](https://archive.org/details/0102WhatYouShouldKnow/02_06-jaggedArrays.mp4)
-        - [Resizing arrays (wideo)](https://archive.org/details/0102WhatYouShouldKnow/03_01-resizableArrays.mp4)
     - [ ] Zaimplementuj vector (mutable array z automatycznym zmienianiem rozmiaru):
         - [ ] Practice coding using arrays and pointers, and pointer math to jump to an index instead of using indexing.
         - [ ] new raw data array with allocated memory
@@ -589,14 +585,11 @@ Napisz kod na tablicy lub papierze, a nie na komputerze. Testuj z niektórymi pr
 
 - ### Stos
     - [ ] [Stacks (wideo)](https://www.coursera.org/learn/data-structures/lecture/UdKzQ/stacks)
-    - [ ] [Using Stacks Last-In First-Out (wideo)](https://archive.org/details/0102WhatYouShouldKnow/05_01-usingStacksForLast-inFirst-out.mp4)
     - [ ] Will not implement. Implementing with array is trivial.
 
 - ### Kolejka
-    - [ ] [Using Queues First-In First-Out(wideo)](https://archive.org/details/0102WhatYouShouldKnow/05_03-usingQueuesForFirst-inFirst-out.mp4)
     - [ ] [Queue (wideo)](https://www.coursera.org/lecture/data-structures/queues-EShpq)
     - [ ] [Circular buffer/FIFO](https://en.wikipedia.org/wiki/Circular_buffer)
-    - [ ] [Priority Queues (wideo)](https://archive.org/details/0102WhatYouShouldKnow/05_04-priorityQueuesAndDeques.mp4)
     - [ ] Implement using linked-list, with tail pointer:
         - enqueue(value) - adds value at position at tail
         - dequeue() - returns value and removes least recently added element (front)
@@ -623,10 +616,6 @@ Napisz kod na tablicy lub papierze, a nie na komputerze. Testuj z niektórymi pr
         - [ ] [(Zaawansowane) Perfect hashing (wideo)](https://www.youtube.com/watch?v=N0COwN14gt0&list=PL2B4EEwhKD-NbwZ4ezj7gyc_3yNrojKM9&index=4)
 
     - [ ] Kursy online:
-        - [ ] [Understanding Hash Functions (wideo)](https://archive.org/details/0102WhatYouShouldKnow/06_02-understandingHashFunctions.mp4)
-        - [ ] [Using Hash Tables (wideo)](https://archive.org/details/0102WhatYouShouldKnow/06_03-usingHashTables.mp4)
-        - [ ] [Supporting Hashing (video)](https://archive.org/details/0102WhatYouShouldKnow/06_04-supportingHashing.mp4)
-        - [ ] [Language Support Hash Tables (wideo)](https://archive.org/details/0102WhatYouShouldKnow/06_05-languageSupportForHashTables.mp4)
         - [ ] [Core Hash Tables (wideo)](https://www.coursera.org/learn/data-structures-optimizing-performance/lecture/m7UuP/core-hash-tables)
         - [ ] [Data Structures (wideo)](https://www.coursera.org/learn/data-structures/home/week/4)
         - [ ] [Phone Book Problem (wideo)](https://www.coursera.org/learn/data-structures/lecture/NYZZP/phone-book-problem)
@@ -1295,7 +1284,6 @@ Uzupełniające:
 - [Mathematics for Topcoders](https://www.topcoder.com/community/competitive-programming/tutorials/mathematics-for-topcoders/)
 - [Dynamic Programming – From Novice to Advanced](https://www.topcoder.com/community/competitive-programming/tutorials/dynamic-programming-from-novice-to-advanced/)
 - [MIT Interview Materials](https://web.archive.org/web/20160906124824/http://courses.csail.mit.edu/iap/interview/materials.php)
-- [Exercises for getting better at a given language](http://exercism.io/languages)
 
 **Przeczytaj i wykonaj zadania z programowania (w tej kolejności):**
 

translations/README-ptbr.md

@@ -198,7 +198,6 @@ Se você quer ser um engenheiro de confiabilidade ou engenheiro de sistemas, est
     - [Árvores k-D](#Árvores-k-d)
     - [Skiplists](#skiplists)
     - [Fluxos de Rede](#fluxos-de-rede)
-    - [Conjuntos Disjuntos e Union-find](#conjuntos-disjuntos-e-union-find)
     - [Matemática para Processamento Rápido](#matemática-para-processamento-rápido)
     - [Treap](#treap)
     - [Programação Linear](#programação-linear-vídeos)
@@ -555,12 +554,8 @@ Escreva código em um quadro branco ou papel, não em um computador. Teste com u
     - [ ] Descrição:
         - [Arrays (video)](https://www.coursera.org/learn/data-structures/lecture/OsBSF/arrays)
         - [UCBerkley CS61B - Linear and Multi-Dim Arrays (video)](https://youtu.be/Wp8oiO_CZZE?t=15m32s) (Arrays lineares e multidimensionais - vídeo)
-        - [Basic Arrays (video)](https://archive.org/details/0102WhatYouShouldKnow/02_04-basicArrays.mp4) (Arrays básicos - vídeo)
-        - [Multi-dim (video)](https://archive.org/details/0102WhatYouShouldKnow/02_05-multidimensionalArrays.mp4) (Multidimensionais - vídeo)
         - [Dynamic Arrays (video)](https://www.coursera.org/learn/data-structures/lecture/EwbnV/dynamic-arrays) (Arrays Dinâmicos - vídeo)
         - [Jagged Arrays (video)](https://www.youtube.com/watch?v=1jtrQqYpt7g) (Arrays Multidimensionais - vídeo)
-        - [Jagged Arrays (video)](https://archive.org/details/0102WhatYouShouldKnow/02_06-jaggedArrays.mp4) (Arrays Multidimensionais - vídeo)
-        - [Resizing arrays (video)](https://archive.org/details/0102WhatYouShouldKnow/03_01-resizableArrays.mp4) (Arrays Dinâmicos)
     - [ ] Implementar um vetor (array mutável com redimensionamento automático):
         - [ ] Praticar programação usando arrays e ponteiros, e matemática de ponteiros para pular para um índice ao invés de usar indexação.
         - [ ] novo array de dados brutos com memória alocada
@@ -623,14 +618,11 @@ Escreva código em um quadro branco ou papel, não em um computador. Teste com u
 
 - ### Stack
     - [ ] [Stacks (video)](https://www.coursera.org/learn/data-structures/lecture/UdKzQ/stacks)
-    - [ ] [Using Stacks Last-In First-Out (video)](https://archive.org/details/0102WhatYouShouldKnow/05_01-usingStacksForLast-inFirst-out.mp4) (Usando Stacks Último a Entrar Primeiro a Sair - vídeo)
     - [ ] Não implementarei. Implementar com array é trivial.
 
 - ### Queue (Fila)
-    - [ ] [Using Queues First-In First-Out(video)](https://archive.org/details/0102WhatYouShouldKnow/05_03-usingQueuesForFirst-inFirst-out.mp4) (Usando queues FIFO(Primeiro a entrar, último a sair) - vídeo)
     - [ ] [Queue (video)](https://www.coursera.org/learn/data-structures/lecture/EShpq/queue)
     - [ ] [Circular buffer/FIFO](https://en.wikipedia.org/wiki/Circular_buffer) (Buffer circular/Primeiro a entrar, último a sair)
-    - [ ] [Priority Queues (video)](https://archive.org/details/0102WhatYouShouldKnow/05_04-priorityQueuesAndDeques.mp4) (Queues com Prioridade - vídeo)
     - [ ] Implementar usando lista ligada, com ponteiro de cauda (aponta para o último elemento de uma lista):
         - enqueue(valor) - adiciona "valor" na posição na cauda (final da lista)
         - dequeue() - retorna um valor e remove o elemento menos recentemente adicionado (início da lista))
@@ -657,10 +649,6 @@ Escreva código em um quadro branco ou papel, não em um computador. Teste com u
         - [ ] [(Advanced) Perfect hashing (video)](https://www.youtube.com/watch?v=N0COwN14gt0&list=PL2B4EEwhKD-NbwZ4ezj7gyc_3yNrojKM9&index=4) ((Avançado) Hashing perfeito - vídeo)
 
     - [ ] Cursos Online:
-        - [ ] [Understanding Hash Functions (video)](https://archive.org/details/0102WhatYouShouldKnow/06_02-understandingHashFunctions.mp4) (Compreendendo Funções Hash - vídeo)
-        - [ ] [Using Hash Tables (video)](https://archive.org/details/0102WhatYouShouldKnow/06_03-usingHashTables.mp4) (Usando Tabelas Hash - vídeo)
-        - [ ] [Supporting Hashing (video)](https://archive.org/details/0102WhatYouShouldKnow/06_04-supportingHashing.mp4) (Hashing de Suporte - vídeo)
-        - [ ] [Language Support Hash Tables (video)](https://archive.org/details/0102WhatYouShouldKnow/06_05-languageSupportForHashTables.mp4) (Tabelas Hash de Suporte de Linguagem - vídeo)
         - [ ] [Core Hash Tables (video)](https://www.coursera.org/learn/data-structures-optimizing-performance/lecture/m7UuP/core-hash-tables) (Fundamentos de Tabelas Hash - vídeo)
         - [ ] [Data Structures (video)](https://www.coursera.org/learn/data-structures/home/week/3) (Estruturas de Dados - vídeo)
         - [ ] [Phone Book Problem (video)](https://www.coursera.org/learn/data-structures/lecture/NYZZP/phone-book-problem) (Problema da Lista Telefônica (vídeo) )
@@ -810,25 +798,6 @@ Escreva código em um quadro branco ou papel, não em um computador. Teste com u
 
 - Para heapsort, veja estrutura de dados heap acima. Heapsort é ótimo, mas não é estável.
 
-- [ ] [Sedgewick - Mergesort (5 vídeos)](https://www.youtube.com/watch?v=4nKwesx_c8E&list=PLe-ggMe31CTeunC6GZHFBmQx7EKtjbGf9)
-    - [ ] [1. Mergesort](https://www.youtube.com/watch?v=4nKwesx_c8E&list=PLe-ggMe31CTeunC6GZHFBmQx7EKtjbGf9&index=1)
-    - [ ] [2. Bottom up Mergesort](https://www.youtube.com/watch?v=HGOIGUYjeyk&list=PLe-ggMe31CTeunC6GZHFBmQx7EKtjbGf9&index=2) (Mergesort de baixo para cima)
-    - [ ] [3. Sorting Complexity](https://www.youtube.com/watch?v=WvU_mIWo0Ac&index=3&list=PLe-ggMe31CTeunC6GZHFBmQx7EKtjbGf9) (Complexidade de Ordenação)
-    - [ ] [4. Comparators](https://www.youtube.com/watch?v=7MvC1kmBza0&index=4&list=PLe-ggMe31CTeunC6GZHFBmQx7EKtjbGf9) (Comparadores)
-    - [ ] [5. Stability](https://www.youtube.com/watch?v=XD_5iINB5GI&index=5&list=PLe-ggMe31CTeunC6GZHFBmQx7EKtjbGf9) (Estabilidade)
-
-- [ ] [Sedgewick - Quicksort (4 vídeos)](https://www.youtube.com/playlist?list=PLe-ggMe31CTeE3x2-nF1-toca1QpuXwE1)
-    - [ ] [1. Quicksort](https://www.youtube.com/watch?v=5M5A7qPWk84&index=1&list=PLe-ggMe31CTeE3x2-nF1-toca1QpuXwE1)
-    - [ ] [2. Selection](https://www.youtube.com/watch?v=CgVYfSyct_M&index=2&list=PLe-ggMe31CTeE3x2-nF1-toca1QpuXwE1) (Seleção)
-    - [ ] [3. Duplicate Keys](https://www.youtube.com/watch?v=WBFzOYJ5ybM&index=3&list=PLe-ggMe31CTeE3x2-nF1-toca1QpuXwE1) (Chaves Duplicadas)
-    - [ ] [4. System Sorts](https://www.youtube.com/watch?v=rejpZ2htBjE&index=4&list=PLe-ggMe31CTeE3x2-nF1-toca1QpuXwE1) (Ordenações de Sistema)
-
-- [ ] Universidade da Califórnia em Berkeley:
-    - [ ] [CS 61B Lecture 29: Sorting I (video)](https://www.youtube.com/watch?v=EiUvYS2DT6I&list=PL4BBB74C7D2A1049C&index=29) (Ciência da Computação 61B Aula 29: Ordenação I - vídeo)
-    - [ ] [CS 61B Lecture 30: Sorting II (video)](https://www.youtube.com/watch?v=2hTY3t80Qsk&list=PL4BBB74C7D2A1049C&index=30) (Ciência da Computação 61B Aula 30: Ordenação II - vídeo)
-    - [ ] [CS 61B Lecture 32: Sorting III (video)](https://www.youtube.com/watch?v=Y6LOLpxg6Dc&index=32&list=PL4BBB74C7D2A1049C) (Ciência da Computação 61B Aula 32: Ordenação III - vídeo)
-    - [ ] [CS 61B Lecture 33: Sorting V (video)](https://www.youtube.com/watch?v=qNMQ4ly43p4&index=33&list=PL4BBB74C7D2A1049C) (Ciência da Computação 61B Aula 33: Ordenação V - vídeo)
-
 - [ ] [Bubble Sort (video)](https://www.youtube.com/watch?v=P00xJgWzz2c&index=1&list=PL89B61F78B552C1AB) (Ordenação por Bolha - vídeo)
 - [ ] [Analyzing Bubble Sort (video)](https://www.youtube.com/watch?v=ni_zk257Nqo&index=7&list=PL89B61F78B552C1AB) (Analisando Ordenação por Bolha - vídeo)
 - [ ] [Insertion Sort, Merge Sort (video)](https://www.youtube.com/watch?v=Kg4bqzAqRBM&index=3&list=PLUl4u3cNGP61Oq3tWYp6V_F-5jb5L2iHb) (Ordenação por Inserção, Ordenação por Mistura - vídeo)
@@ -1351,32 +1320,6 @@ Você ganhará mais prática com grafos no livro do Skiena (veja a seção de li
     - [Vídeos](https://www.youtube.com/watch?v=r4r1DZcx1cM&list=PLmVb1OknmNJuC5POdcDv5oCS7_OUkDgpj&index=22)
 - [ ] Séries de vídeos curtos (2 - 5 minutos) sobre o assunto - Michael Sambol (18 vídeos):
     - [Vídeos](https://www.youtube.com/channel/UCzDJwLWoYCUQowF_nG3m5OQ)
-- [ ] [Sedgewick Videos - Algorithms I](https://www.youtube.com/user/algorithmscourses/playlists?shelf_id=2&view=50&sort=dd) (Vídeos de Sedgewick - Algoritmos I)
-    - [ ] [01. Union-Find](https://www.youtube.com/watch?v=8mYfZeHtdNc&list=PLe-ggMe31CTexoNYnMhbHaWhQ0dvcy43t)
-    - [ ] [02. Analysis of Algorithms](https://www.youtube.com/watch?v=ZN-nFW0mEpg&list=PLe-ggMe31CTf0_bkOhh7sa5uqeppp3Sr0) (Análises de Algoritmos)
-    - [ ] [03. Stacks and Queues](https://www.youtube.com/watch?v=TIC1gappbP8&list=PLe-ggMe31CTe-9jhnj3P_3mmrCh0A7iHh) (Memórias Estáticas e Filas)
-    - [ ] [04. Elementary Sorts](https://www.youtube.com/watch?v=CD2AL6VO0ak&list=PLe-ggMe31CTe_5WhGV0F--7CK8MoRUqBd) (Ordenações Elementares)
-    - [ ] [05. Mergesort](https://www.youtube.com/watch?v=4nKwesx_c8E&list=PLe-ggMe31CTeunC6GZHFBmQx7EKtjbGf9)
-    - [ ] [06. Quicksort](https://www.youtube.com/watch?v=5M5A7qPWk84&list=PLe-ggMe31CTeE3x2-nF1-toca1QpuXwE1)
-    - [ ] [07. Priority Queues](https://www.youtube.com/watch?v=G9TMe0KC0w0&list=PLe-ggMe31CTducy9LDiGVkdSv0NfiRwn5) (Filas Prioritárias)
-    - [ ] [08. Elementary Symbol Tables](https://www.youtube.com/watch?v=up_nlilw3ac&list=PLe-ggMe31CTc3a8nKRDxFZZrWrBvkc9SG) (Tabelas de Símbolos Elementares)
-    - [ ] [09. Balanced Search Trees](https://www.youtube.com/watch?v=qC1BLLPK_5w&list=PLe-ggMe31CTf7jHH_mFT50kayjCEA6Rhu) (Árvores de Busca Balanceadas)
-    - [ ] [10. Geometric Applications of BST](https://www.youtube.com/watch?v=Wl30aGAp6TY&list=PLe-ggMe31CTdBsRIw0hXln0hilRs-DqAx) (Aplicações Geométricas de Árvores de Busca Balanceada)
-    - [ ] [11. Hash Tables](https://www.youtube.com/watch?v=QA8fJGO-i9o&list=PLe-ggMe31CTcKxIRGqqThMts2eHtSrf11) (Tabelas Hash)
-- [ ] [Sedgewick Videos - Algorithms II](https://www.youtube.com/user/algorithmscourses/playlists?flow=list&shelf_id=3&view=50) (Vídeos de Sedgewick - Algoritmos II)
-    - [ ] [01. Undirected Graphs](https://www.youtube.com/watch?v=GmVhD-mmMBg&list=PLe-ggMe31CTc0zDzANxl4I2MhMoRVlbRM) (Grafos Não Direcionados)
-    - [ ] [02. Directed Graphs](https://www.youtube.com/watch?v=_z-JsVaUS40&list=PLe-ggMe31CTcEwaU8a1P1Gd95A77HV85K) (Grafos Direcionados)
-    - [ ] [03. Minimum Spanning Trees](https://www.youtube.com/watch?v=t8fNk9tfVYY&list=PLe-ggMe31CTceUZxDesGfHGLE7kcSafqj) (Árvores de Extensão Mínima)
-    - [ ] [04. Shortest Paths](https://www.youtube.com/watch?v=HoGSiB7tSeI&list=PLe-ggMe31CTePpG3jbeOTsnGUGZDKxgZD) (Menores Caminhos)
-    - [ ] [05. Maximum Flow](https://www.youtube.com/watch?v=rYIKlFstBqE&list=PLe-ggMe31CTduQ68XQ-sVj32wYJIspTma) (Fluxo Máximo)
-    - [ ] [06. Radix Sorts](https://www.youtube.com/watch?v=HKPrVm5FWvg&list=PLe-ggMe31CTcNvUX9E3tQeM6ntrdR8e53) (Ordenações Radix)
-    - [ ] [07. Tries](https://www.youtube.com/watch?v=00YaFPcC65g&list=PLe-ggMe31CTe9IyG9MB8vt5xUJeYgOYRQ) (Árvore de Prefixos)
-    - [ ] [08. Substring Search](https://www.youtube.com/watch?v=QzI0p6zDjK4&list=PLe-ggMe31CTdAdjXB3lIuf2maubzo9t66) (Busca de Substring)
-    - [ ] [09. Regular Expressions](https://www.youtube.com/watch?v=TQWNQsJSPnk&list=PLe-ggMe31CTetTlJWouM42fyttyKPgSDh) (Expressões Regulares)
-    - [ ] [10. Data Compression](https://www.youtube.com/watch?v=at9tjpxcBh8&list=PLe-ggMe31CTciifRRo6yY0Yt0mzgIXXVZ) (Compressão de Dados)
-    - [ ] [11. Reductions](https://www.youtube.com/watch?v=Ow5x-ooMGv8&list=PLe-ggMe31CTe_yliW5vc3yO-dj1LSSDyF) (Reduções)
-    - [ ] [12. Linear Programming](https://www.youtube.com/watch?v=rWhcLyiLZLA&list=PLe-ggMe31CTdy6dKzMgkWFuTTN1H8B-E1) (Programação Linear)
-    - [ ] [13. Intractability](https://www.youtube.com/watch?v=6qcaaDp4cdQ&list=PLe-ggMe31CTcZCjluBHw53e_ek2k9Kn-S) (Intratabilidade)
 
 ---
 
@@ -1409,7 +1352,6 @@ Suplementar:
 - [Mathematics for Topcoders](https://www.topcoder.com/community/data-science/data-science-tutorials/mathematics-for-topcoders/) (Matemática para Topcoders)
 - [Dynamic Programming – From Novice to Advanced](https://www.topcoder.com/community/data-science/data-science-tutorials/dynamic-programming-from-novice-to-advanced/) (Programação Dinâmica - De Novato a Avançado)
 - [MIT Interview Materials](https://web.archive.org/web/20160906124824/http://courses.csail.mit.edu/iap/interview/materials.php) (Materiais de Entrevista do MIT)
-- [Exercises for getting better at a given language](http://exercism.io/languages) (Exercícios para ficar melhor em uma determinada linguagem)
 
 **Leia e Faça os Problemas de Programação (nessa ordem):**
 
@@ -1804,10 +1746,6 @@ Esses tópicos provavelmente não aparecerão em uma entrevista, mas eu adicione
     - [ ] [Ford-Fulkerson Algorithm (video)](https://www.youtube.com/watch?v=v1VgJmkEJW0) (Algoritmo de Ford-Fulkerson)
     - [ ] [Network Flows (video)](https://www.youtube.com/watch?v=2vhN4Ice5jI) (Fluxos de Rede - vídeo)
 
-- ### Conjuntos Disjuntos e Union-find
-    - [ ] [UCB 61B - Disjoint Sets; Sorting & selection (video)](https://www.youtube.com/watch?v=MAEGXTwmUsI&list=PL-XXv-cvA_iAlnI-BQr9hjqADPBtujFJd&index=21) (UCB 61B - Conjuntos Disjuntos; Ordenação e seleção - vídeo)
-    - [ ] [Sedgewick Algorithms - Union-Find (6 videos)](https://www.youtube.com/watch?v=8mYfZeHtdNc&list=PLe-ggMe31CTexoNYnMhbHaWhQ0dvcy43t) (Algoritmos de Sedgewick - Union-find - 6 vídeos)
-
 - ### Matemática para Processamento Rápido
     - [ ] [Integer Arithmetic, Karatsuba Multiplication (video)](https://www.youtube.com/watch?v=eCaXlAaN2uE&index=11&list=PLUl4u3cNGP61Oq3tWYp6V_F-5jb5L2iHb) (Aritmética de Números Inteiros, Multiplicação de Karatsuba - vídeo)
     - [ ] [The Chinese Remainder Theorem (used in cryptography) (video)](https://www.youtube.com/watch?v=ru7mWZJlRQg) (O Teorema Chinês do Resto)

translations/README-ru.md

@@ -868,25 +868,6 @@ Google не возьмёт тебя на работу.
 
 - Для пирамидальной сортировки, см. структуру данных "Куча" выше. Пирамидальная сортировка эффективна, но не устойчива.
 
-- [ ] [Седжвик (Sedgewick) - Сортировка слиянием (5 видео)](https://www.youtube.com/watch?v=4nKwesx_c8E&list=PLe-ggMe31CTeunC6GZHFBmQx7EKtjbGf9)
-    - [ ] [1. Сортировка слиянием](https://www.youtube.com/watch?v=4nKwesx_c8E&list=PLe-ggMe31CTeunC6GZHFBmQx7EKtjbGf9&index=1)
-    - [ ] [2. Сортировка слиянием наизнанку](https://www.youtube.com/watch?v=HGOIGUYjeyk&list=PLe-ggMe31CTeunC6GZHFBmQx7EKtjbGf9&index=2)
-    - [ ] [3. Сложность сортировки](https://www.youtube.com/watch?v=WvU_mIWo0Ac&index=3&list=PLe-ggMe31CTeunC6GZHFBmQx7EKtjbGf9)
-    - [ ] [4. Компараторы](https://www.youtube.com/watch?v=7MvC1kmBza0&index=4&list=PLe-ggMe31CTeunC6GZHFBmQx7EKtjbGf9)
-    - [ ] [5. Устойчивость](https://www.youtube.com/watch?v=XD_5iINB5GI&index=5&list=PLe-ggMe31CTeunC6GZHFBmQx7EKtjbGf9)
-
-- [ ] [Седжвик (Sedgewick) - Быстрая сортировка (4 видео)](https://www.youtube.com/playlist?list=PLe-ggMe31CTeE3x2-nF1-toca1QpuXwE1)
-    - [ ] [1. Быстрая сортировка](https://www.youtube.com/watch?v=5M5A7qPWk84&index=1&list=PLe-ggMe31CTeE3x2-nF1-toca1QpuXwE1)
-    - [ ] [2. Выбор](https://www.youtube.com/watch?v=CgVYfSyct_M&index=2&list=PLe-ggMe31CTeE3x2-nF1-toca1QpuXwE1)
-    - [ ] [3. Дублирование ключей](https://www.youtube.com/watch?v=WBFzOYJ5ybM&index=3&list=PLe-ggMe31CTeE3x2-nF1-toca1QpuXwE1)
-    - [ ] [4. Системные сортировки](https://www.youtube.com/watch?v=rejpZ2htBjE&index=4&list=PLe-ggMe31CTeE3x2-nF1-toca1QpuXwE1)
-
-- [ ] UC Berkeley:
-    - [ ] [CS 61B Лекция 29: Сортировка I (видео)](https://www.youtube.com/watch?v=EiUvYS2DT6I&list=PL4BBB74C7D2A1049C&index=29)
-    - [ ] [CS 61B Лекция 30: Сортировка II (видео)](https://www.youtube.com/watch?v=2hTY3t80Qsk&list=PL4BBB74C7D2A1049C&index=30)
-    - [ ] [CS 61B Лекция 32: Сортировка III (видео)](https://www.youtube.com/watch?v=Y6LOLpxg6Dc&index=32&list=PL4BBB74C7D2A1049C)
-    - [ ] [CS 61B Лекция 33: Сортировка V (видео)](https://www.youtube.com/watch?v=qNMQ4ly43p4&index=33&list=PL4BBB74C7D2A1049C)
-
 - [ ] [Пузырькова сортировка (видео)](https://www.youtube.com/watch?v=P00xJgWzz2c&index=1&list=PL89B61F78B552C1AB)
 - [ ] [Анализ пузырьковой сортировки (видео)](https://www.youtube.com/watch?v=ni_zk257Nqo&index=7&list=PL89B61F78B552C1AB)
 - [ ] [Сортировка вставками, Сортировка слиянием (видео)](https://www.youtube.com/watch?v=Kg4bqzAqRBM&index=3&list=PLUl4u3cNGP61Oq3tWYp6V_F-5jb5L2iHb)
@@ -1324,32 +1305,6 @@ Google не возьмёт тебя на работу.
     - [Видео](https://www.youtube.com/watch?v=r4r1DZcx1cM&list=PLmVb1OknmNJuC5POdcDv5oCS7_OUkDgpj&index=22)
 - [ ] Серия коротких 2-5 минутных видео - Michael Sambol (18 видео):
     - [Видео](https://www.youtube.com/channel/UCzDJwLWoYCUQowF_nG3m5OQ)
-- [ ] [Видео от Сэджвика - Алгоритмы I](https://www.youtube.com/user/algorithmscourses/playlists?shelf_id=2&view=50&sort=dd)
-    - [ ] [01. Union-Find](https://www.youtube.com/watch?v=8mYfZeHtdNc&list=PLe-ggMe31CTexoNYnMhbHaWhQ0dvcy43t)
-    - [ ] [02. Анализ Алгоритмов](https://www.youtube.com/watch?v=ZN-nFW0mEpg&list=PLe-ggMe31CTf0_bkOhh7sa5uqeppp3Sr0)
-    - [ ] [03. Стэки и Очереди](https://www.youtube.com/watch?v=TIC1gappbP8&list=PLe-ggMe31CTe-9jhnj3P_3mmrCh0A7iHh)
-    - [ ] [04. Элементарные сортировки](https://www.youtube.com/watch?v=CD2AL6VO0ak&list=PLe-ggMe31CTe_5WhGV0F--7CK8MoRUqBd)
-    - [ ] [05. Mergesort](https://www.youtube.com/watch?v=4nKwesx_c8E&list=PLe-ggMe31CTeunC6GZHFBmQx7EKtjbGf9)
-    - [ ] [06. Quicksort](https://www.youtube.com/watch?v=5M5A7qPWk84&list=PLe-ggMe31CTeE3x2-nF1-toca1QpuXwE1)
-    - [ ] [07. Приоритетные очереди](https://www.youtube.com/watch?v=G9TMe0KC0w0&list=PLe-ggMe31CTducy9LDiGVkdSv0NfiRwn5)
-    - [ ] [08. Элементарные таблицы символов](https://www.youtube.com/watch?v=up_nlilw3ac&list=PLe-ggMe31CTc3a8nKRDxFZZrWrBvkc9SG)
-    - [ ] [09. Сбалансированные деревья поиска](https://www.youtube.com/watch?v=qC1BLLPK_5w&list=PLe-ggMe31CTf7jHH_mFT50kayjCEA6Rhu)
-    - [ ] [10. Геометрические применениния BST](https://www.youtube.com/watch?v=Wl30aGAp6TY&list=PLe-ggMe31CTdBsRIw0hXln0hilRs-DqAx)
-    - [ ] [11. Хэш таблицы](https://www.youtube.com/watch?v=QA8fJGO-i9o&list=PLe-ggMe31CTcKxIRGqqThMts2eHtSrf11)
-- [ ] [Видео от Сэджвика - Алгоритмы II](https://www.youtube.com/user/algorithmscourses/playlists?flow=list&shelf_id=3&view=50)
-    - [ ] [01. Ненаправленные графы](https://www.youtube.com/watch?v=GmVhD-mmMBg&list=PLe-ggMe31CTc0zDzANxl4I2MhMoRVlbRM)
-    - [ ] [02. Направленные графы](https://www.youtube.com/watch?v=_z-JsVaUS40&list=PLe-ggMe31CTcEwaU8a1P1Gd95A77HV85K)
-    - [ ] [03. Minimum Spanning Trees](https://www.youtube.com/watch?v=t8fNk9tfVYY&list=PLe-ggMe31CTceUZxDesGfHGLE7kcSafqj)
-    - [ ] [04. Кратчайшие пути](https://www.youtube.com/watch?v=HoGSiB7tSeI&list=PLe-ggMe31CTePpG3jbeOTsnGUGZDKxgZD)
-    - [ ] [05. Maximum Flow](https://www.youtube.com/watch?v=rYIKlFstBqE&list=PLe-ggMe31CTduQ68XQ-sVj32wYJIspTma)
-    - [ ] [06. Radix Sorts](https://www.youtube.com/watch?v=HKPrVm5FWvg&list=PLe-ggMe31CTcNvUX9E3tQeM6ntrdR8e53)
-    - [ ] [07. Tries](https://www.youtube.com/watch?v=00YaFPcC65g&list=PLe-ggMe31CTe9IyG9MB8vt5xUJeYgOYRQ)
-    - [ ] [08. Поиск подстроки](https://www.youtube.com/watch?v=QzI0p6zDjK4&list=PLe-ggMe31CTdAdjXB3lIuf2maubzo9t66)
-    - [ ] [09. Регулярные выражения](https://www.youtube.com/watch?v=TQWNQsJSPnk&list=PLe-ggMe31CTetTlJWouM42fyttyKPgSDh)
-    - [ ] [10. Сжатие данных](https://www.youtube.com/watch?v=at9tjpxcBh8&list=PLe-ggMe31CTciifRRo6yY0Yt0mzgIXXVZ)
-    - [ ] [11. Reductions](https://www.youtube.com/watch?v=Ow5x-ooMGv8&list=PLe-ggMe31CTe_yliW5vc3yO-dj1LSSDyF)
-    - [ ] [12. Линейное программирование](https://www.youtube.com/watch?v=rWhcLyiLZLA&list=PLe-ggMe31CTdy6dKzMgkWFuTTN1H8B-E1)
-    - [ ] [13. Intractability](https://www.youtube.com/watch?v=6qcaaDp4cdQ&list=PLe-ggMe31CTcZCjluBHw53e_ek2k9Kn-S)
 
 ---
 
@@ -1381,7 +1336,6 @@ Google не возьмёт тебя на работу.
 - [Математика для Топ-кодеров](https://www.topcoder.com/community/data-science/data-science-tutorials/mathematics-for-topcoders/)
 - [Динамическое программирование - От новичка до продвинутого](https://www.topcoder.com/community/data-science/data-science-tutorials/dynamic-programming-from-novice-to-advanced/)
 - [Материалы для интервью от MIT](https://web.archive.org/web/20160906124824/http://courses.csail.mit.edu/iap/interview/materials.php)
-- [Упражнения по улучшению навыков для определенного языка](http://exercism.io/languages)
 
 **Прочитайте и выполните упражнения (именно в этом порядке):**
 
@@ -1825,10 +1779,6 @@ Google не возьмёт тебя на работу.
     - [ ] [Алгоритм Форд — Фалкерсона (video)](https://www.youtube.com/watch?v=v1VgJmkEJW0)
     - [ ] [Транспортные сети (видео)](https://www.youtube.com/watch?v=2vhN4Ice5jI)
 
-- ### Непересекающиеся Множества и Система Непересекающихся Множеств
-    - [ ] [UCB 61B - Непересекающиеся Множества; Сортировка и выборка (видео)](https://www.youtube.com/watch?v=MAEGXTwmUsI&list=PL-XXv-cvA_iAlnI-BQr9hjqADPBtujFJd&index=21)
-    - [ ] [Алгоритмы Седжвика - Система непересекающихся множеств (6 видео)](https://www.youtube.com/watch?v=8mYfZeHtdNc&list=PLe-ggMe31CTexoNYnMhbHaWhQ0dvcy43t)
-
 - ### Математика для Быстрой Обработки
     - [ ] [Арифметика целых чисел, Умножение Карацубы (видео)](https://www.youtube.com/watch?v=eCaXlAaN2uE&index=11&list=PLUl4u3cNGP61Oq3tWYp6V_F-5jb5L2iHb)
     - [ ] [Китайская теорема об остатках (используется в криптографии) (видео)](https://www.youtube.com/watch?v=ru7mWZJlRQg)

translations/README-th.md

@@ -177,7 +177,6 @@
     - [ต้นไม้แบบ k-D](#k-d-trees)
     - [การข้ามรายการ](#skip-lists)
     - [กระแสเครือข่าย](#network-flows)
-    - [โครงสร้างข้อมูลไม่มีส่วนร่วม และ ยูเนียนและค้นหา](#disjoint-sets--union-find)
     - [คณิตศาสต์สำหรับการประมวณผลอย่างรวดเร็ว](#math-for-fast-processing)
     - [ทรีพ](#treap)
     - [การโปรแกรมเชิงเส้น](#linear-programming)
@@ -535,12 +534,8 @@ There are a lot of distractions that can take up valuable time. Focus and concen
     - [ ] Description:
         - [Arrays (video)](https://www.coursera.org/learn/data-structures/lecture/OsBSF/arrays)
         - [UCBerkley CS61B - Linear and Multi-Dim Arrays (video)](https://youtu.be/Wp8oiO_CZZE?t=15m32s)
-        - [Basic Arrays (video)](https://archive.org/details/0102WhatYouShouldKnow/02_04-basicArrays.mp4)
-        - [Multi-dim (video)](https://archive.org/details/0102WhatYouShouldKnow/02_05-multidimensionalArrays.mp4)
         - [Dynamic Arrays (video)](https://www.coursera.org/learn/data-structures/lecture/EwbnV/dynamic-arrays)
         - [Jagged Arrays (video)](https://www.youtube.com/watch?v=1jtrQqYpt7g)
-        - [Jagged Arrays (video)](https://archive.org/details/0102WhatYouShouldKnow/02_06-jaggedArrays.mp4)
-        - [Resizing arrays (video)](https://archive.org/details/0102WhatYouShouldKnow/03_01-resizableArrays.mp4)
     - [ ] Implement a vector (mutable array with automatic resizing):
         - [ ] Practice coding using arrays and pointers, and pointer math to jump to an index instead of using indexing.
         - [ ] new raw data array with allocated memory
@@ -602,14 +597,11 @@ There are a lot of distractions that can take up valuable time. Focus and concen
 
 - ### Stack
     - [ ] [Stacks (video)](https://www.coursera.org/learn/data-structures/lecture/UdKzQ/stacks)
-    - [ ] [Using Stacks Last-In First-Out (video)](https://archive.org/details/0102WhatYouShouldKnow/05_01-usingStacksForLast-inFirst-out.mp4)
     - [ ] Will not implement. Implementing with array is trivial.
 
 - ### Queue
-    - [ ] [Using Queues First-In First-Out(video)](https://archive.org/details/0102WhatYouShouldKnow/05_03-usingQueuesForFirst-inFirst-out.mp4)
     - [ ] [Queue (video)](https://www.coursera.org/learn/data-structures/lecture/EShpq/queue)
     - [ ] [Circular buffer/FIFO](https://en.wikipedia.org/wiki/Circular_buffer)
-    - [ ] [Priority Queues (video)](https://archive.org/details/0102WhatYouShouldKnow/05_04-priorityQueuesAndDeques.mp4)
     - [ ] Implement using linked-list, with tail pointer:
         - enqueue(value) - adds value at position at tail
         - dequeue() - returns value and removes least recently added element (front)
@@ -636,10 +628,6 @@ There are a lot of distractions that can take up valuable time. Focus and concen
         - [ ] [(Advanced) Perfect hashing (video)](https://www.youtube.com/watch?v=N0COwN14gt0&list=PL2B4EEwhKD-NbwZ4ezj7gyc_3yNrojKM9&index=4)
 
     - [ ] Online Courses:
-        - [ ] [Understanding Hash Functions (video)](https://archive.org/details/0102WhatYouShouldKnow/06_02-understandingHashFunctions.mp4)
-        - [ ] [Using Hash Tables (video)](https://archive.org/details/0102WhatYouShouldKnow/06_03-usingHashTables.mp4)
-        - [ ] [Supporting Hashing (video)](https://archive.org/details/0102WhatYouShouldKnow/06_04-supportingHashing.mp4)
-        - [ ] [Language Support Hash Tables (video)](https://archive.org/details/0102WhatYouShouldKnow/06_05-languageSupportForHashTables.mp4)
         - [ ] [Core Hash Tables (video)](https://www.coursera.org/learn/data-structures-optimizing-performance/lecture/m7UuP/core-hash-tables)
         - [ ] [Data Structures (video)](https://www.coursera.org/learn/data-structures/home/week/3)
         - [ ] [Phone Book Problem (video)](https://www.coursera.org/learn/data-structures/lecture/NYZZP/phone-book-problem)
@@ -789,25 +777,6 @@ There are a lot of distractions that can take up valuable time. Focus and concen
 
 - For heapsort, see Heap data structure above. Heap sort is great, but not stable.
 
-- [ ] [Sedgewick - Mergesort (5 videos)](https://www.youtube.com/watch?v=4nKwesx_c8E&list=PLe-ggMe31CTeunC6GZHFBmQx7EKtjbGf9)
-    - [ ] [1. Mergesort](https://www.youtube.com/watch?v=4nKwesx_c8E&list=PLe-ggMe31CTeunC6GZHFBmQx7EKtjbGf9&index=1)
-    - [ ] [2. Bottom up Mergesort](https://www.youtube.com/watch?v=HGOIGUYjeyk&list=PLe-ggMe31CTeunC6GZHFBmQx7EKtjbGf9&index=2)
-    - [ ] [3. Sorting Complexity](https://www.youtube.com/watch?v=WvU_mIWo0Ac&index=3&list=PLe-ggMe31CTeunC6GZHFBmQx7EKtjbGf9)
-    - [ ] [4. Comparators](https://www.youtube.com/watch?v=7MvC1kmBza0&index=4&list=PLe-ggMe31CTeunC6GZHFBmQx7EKtjbGf9)
-    - [ ] [5. Stability](https://www.youtube.com/watch?v=XD_5iINB5GI&index=5&list=PLe-ggMe31CTeunC6GZHFBmQx7EKtjbGf9)
-
-- [ ] [Sedgewick - Quicksort (4 videos)](https://www.youtube.com/playlist?list=PLe-ggMe31CTeE3x2-nF1-toca1QpuXwE1)
-    - [ ] [1. Quicksort](https://www.youtube.com/watch?v=5M5A7qPWk84&index=1&list=PLe-ggMe31CTeE3x2-nF1-toca1QpuXwE1)
-    - [ ] [2. Selection](https://www.youtube.com/watch?v=CgVYfSyct_M&index=2&list=PLe-ggMe31CTeE3x2-nF1-toca1QpuXwE1)
-    - [ ] [3. Duplicate Keys](https://www.youtube.com/watch?v=WBFzOYJ5ybM&index=3&list=PLe-ggMe31CTeE3x2-nF1-toca1QpuXwE1)
-    - [ ] [4. System Sorts](https://www.youtube.com/watch?v=rejpZ2htBjE&index=4&list=PLe-ggMe31CTeE3x2-nF1-toca1QpuXwE1)
-
-- [ ] UC Berkeley:
-    - [ ] [CS 61B Lecture 29: Sorting I (video)](https://www.youtube.com/watch?v=EiUvYS2DT6I&list=PL4BBB74C7D2A1049C&index=29)
-    - [ ] [CS 61B Lecture 30: Sorting II (video)](https://www.youtube.com/watch?v=2hTY3t80Qsk&list=PL4BBB74C7D2A1049C&index=30)
-    - [ ] [CS 61B Lecture 32: Sorting III (video)](https://www.youtube.com/watch?v=Y6LOLpxg6Dc&index=32&list=PL4BBB74C7D2A1049C)
-    - [ ] [CS 61B Lecture 33: Sorting V (video)](https://www.youtube.com/watch?v=qNMQ4ly43p4&index=33&list=PL4BBB74C7D2A1049C)
-
 - [ ] [Bubble Sort (video)](https://www.youtube.com/watch?v=P00xJgWzz2c&index=1&list=PL89B61F78B552C1AB)
 - [ ] [Analyzing Bubble Sort (video)](https://www.youtube.com/watch?v=ni_zk257Nqo&index=7&list=PL89B61F78B552C1AB)
 - [ ] [Insertion Sort, Merge Sort (video)](https://www.youtube.com/watch?v=Kg4bqzAqRBM&index=3&list=PLUl4u3cNGP61Oq3tWYp6V_F-5jb5L2iHb)
@@ -1325,32 +1294,6 @@ You'll get more graph practice in Skiena's book (see Books section below) and th
     - [Videos](https://www.youtube.com/watch?v=r4r1DZcx1cM&list=PLmVb1OknmNJuC5POdcDv5oCS7_OUkDgpj&index=22)
 - [ ] Series of 2-5 minutes short subject videos - Michael Sambol (18 videos):
     - [Videos](https://www.youtube.com/channel/UCzDJwLWoYCUQowF_nG3m5OQ)
-- [ ] [Sedgewick Videos - Algorithms I](https://www.youtube.com/user/algorithmscourses/playlists?shelf_id=2&view=50&sort=dd)
-    - [ ] [01. Union-Find](https://www.youtube.com/watch?v=8mYfZeHtdNc&list=PLe-ggMe31CTexoNYnMhbHaWhQ0dvcy43t)
-    - [ ] [02. Analysis of Algorithms](https://www.youtube.com/watch?v=ZN-nFW0mEpg&list=PLe-ggMe31CTf0_bkOhh7sa5uqeppp3Sr0)
-    - [ ] [03. Stacks and Queues](https://www.youtube.com/watch?v=TIC1gappbP8&list=PLe-ggMe31CTe-9jhnj3P_3mmrCh0A7iHh)
-    - [ ] [04. Elementary Sorts](https://www.youtube.com/watch?v=CD2AL6VO0ak&list=PLe-ggMe31CTe_5WhGV0F--7CK8MoRUqBd)
-    - [ ] [05. Mergesort](https://www.youtube.com/watch?v=4nKwesx_c8E&list=PLe-ggMe31CTeunC6GZHFBmQx7EKtjbGf9)
-    - [ ] [06. Quicksort](https://www.youtube.com/watch?v=5M5A7qPWk84&list=PLe-ggMe31CTeE3x2-nF1-toca1QpuXwE1)
-    - [ ] [07. Priority Queues](https://www.youtube.com/watch?v=G9TMe0KC0w0&list=PLe-ggMe31CTducy9LDiGVkdSv0NfiRwn5)
-    - [ ] [08. Elementary Symbol Tables](https://www.youtube.com/watch?v=up_nlilw3ac&list=PLe-ggMe31CTc3a8nKRDxFZZrWrBvkc9SG)
-    - [ ] [09. Balanced Search Trees](https://www.youtube.com/watch?v=qC1BLLPK_5w&list=PLe-ggMe31CTf7jHH_mFT50kayjCEA6Rhu)
-    - [ ] [10. Geometric Applications of BST](https://www.youtube.com/watch?v=Wl30aGAp6TY&list=PLe-ggMe31CTdBsRIw0hXln0hilRs-DqAx)
-    - [ ] [11. Hash Tables](https://www.youtube.com/watch?v=QA8fJGO-i9o&list=PLe-ggMe31CTcKxIRGqqThMts2eHtSrf11)
-- [ ] [Sedgewick Videos - Algorithms II](https://www.youtube.com/user/algorithmscourses/playlists?flow=list&shelf_id=3&view=50)
-    - [ ] [01. Undirected Graphs](https://www.youtube.com/watch?v=GmVhD-mmMBg&list=PLe-ggMe31CTc0zDzANxl4I2MhMoRVlbRM)
-    - [ ] [02. Directed Graphs](https://www.youtube.com/watch?v=_z-JsVaUS40&list=PLe-ggMe31CTcEwaU8a1P1Gd95A77HV85K)
-    - [ ] [03. Minimum Spanning Trees](https://www.youtube.com/watch?v=t8fNk9tfVYY&list=PLe-ggMe31CTceUZxDesGfHGLE7kcSafqj)
-    - [ ] [04. Shortest Paths](https://www.youtube.com/watch?v=HoGSiB7tSeI&list=PLe-ggMe31CTePpG3jbeOTsnGUGZDKxgZD)
-    - [ ] [05. Maximum Flow](https://www.youtube.com/watch?v=rYIKlFstBqE&list=PLe-ggMe31CTduQ68XQ-sVj32wYJIspTma)
-    - [ ] [06. Radix Sorts](https://www.youtube.com/watch?v=HKPrVm5FWvg&list=PLe-ggMe31CTcNvUX9E3tQeM6ntrdR8e53)
-    - [ ] [07. Tries](https://www.youtube.com/watch?v=00YaFPcC65g&list=PLe-ggMe31CTe9IyG9MB8vt5xUJeYgOYRQ)
-    - [ ] [08. Substring Search](https://www.youtube.com/watch?v=QzI0p6zDjK4&list=PLe-ggMe31CTdAdjXB3lIuf2maubzo9t66)
-    - [ ] [09. Regular Expressions](https://www.youtube.com/watch?v=TQWNQsJSPnk&list=PLe-ggMe31CTetTlJWouM42fyttyKPgSDh)
-    - [ ] [10. Data Compression](https://www.youtube.com/watch?v=at9tjpxcBh8&list=PLe-ggMe31CTciifRRo6yY0Yt0mzgIXXVZ)
-    - [ ] [11. Reductions](https://www.youtube.com/watch?v=Ow5x-ooMGv8&list=PLe-ggMe31CTe_yliW5vc3yO-dj1LSSDyF)
-    - [ ] [12. Linear Programming](https://www.youtube.com/watch?v=rWhcLyiLZLA&list=PLe-ggMe31CTdy6dKzMgkWFuTTN1H8B-E1)
-    - [ ] [13. Intractability](https://www.youtube.com/watch?v=6qcaaDp4cdQ&list=PLe-ggMe31CTcZCjluBHw53e_ek2k9Kn-S)
 
 ---
 
@@ -1383,7 +1326,6 @@ Supplemental:
 - [Mathematics for Topcoders](https://www.topcoder.com/community/data-science/data-science-tutorials/mathematics-for-topcoders/)
 - [Dynamic Programming – From Novice to Advanced](https://www.topcoder.com/community/data-science/data-science-tutorials/dynamic-programming-from-novice-to-advanced/)
 - [MIT Interview Materials](https://web.archive.org/web/20160906124824/http://courses.csail.mit.edu/iap/interview/materials.php)
-- [Exercises for getting better at a given language](http://exercism.io/languages)
 
 **Read and Do Programming Problems (in this order):**
 
@@ -1775,10 +1717,6 @@ software engineer, and to be aware of certain technologies and algorithms, so yo
     - [ ] [Ford-Fulkerson Algorithm (video)](https://www.youtube.com/watch?v=v1VgJmkEJW0)
     - [ ] [Network Flows (video)](https://www.youtube.com/watch?v=2vhN4Ice5jI)
 
-- ### Disjoint Sets & Union Find
-    - [ ] [UCB 61B - Disjoint Sets; Sorting & selection (video)](https://www.youtube.com/watch?v=MAEGXTwmUsI&list=PL-XXv-cvA_iAlnI-BQr9hjqADPBtujFJd&index=21)
-    - [ ] [Sedgewick Algorithms - Union-Find (6 videos)](https://www.youtube.com/watch?v=8mYfZeHtdNc&list=PLe-ggMe31CTexoNYnMhbHaWhQ0dvcy43t)
-
 - ### Math for Fast Processing
     - [ ] [Integer Arithmetic, Karatsuba Multiplication (video)](https://www.youtube.com/watch?v=eCaXlAaN2uE&index=11&list=PLUl4u3cNGP61Oq3tWYp6V_F-5jb5L2iHb)
     - [ ] [The Chinese Remainder Theorem (used in cryptography) (video)](https://www.youtube.com/watch?v=ru7mWZJlRQg)

translations/README-tr.md

@@ -1299,7 +1299,6 @@ Supplemental:
 - [Mathematics for Topcoders](https://www.topcoder.com/community/competitive-programming/tutorials/mathematics-for-topcoders/)
 - [Dynamic Programming – From Novice to Advanced](https://www.topcoder.com/community/competitive-programming/tutorials/dynamic-programming-from-novice-to-advanced/)
 - [MIT Interview Materials](https://web.archive.org/web/20160906124824/http://courses.csail.mit.edu/iap/interview/materials.php)
-- [Exercises for getting better at a given language](http://exercism.io/languages)
 
 **Read and Do Programming Problems (in this order):**
 

translations/README-tw.md

@@ -1267,7 +1267,6 @@
 - [Mathematics for Topcoders](https://www.topcoder.com/community/competitive-programming/tutorials/mathematics-for-topcoders/)
 - [Dynamic Programming – From Novice to Advanced](https://www.topcoder.com/community/competitive-programming/tutorials/dynamic-programming-from-novice-to-advanced/)
 - [MIT Interview Materials](https://web.archive.org/web/20160906124824/http://courses.csail.mit.edu/iap/interview/materials.php)
-- [Exercises for getting better at a given language](http://exercism.io/languages)
   
 
 **閱讀並解題(按照以下順序):**

translations/README-uk.md

@@ -220,7 +220,6 @@ Facebook та Microsoft, відрізняють розробку програм
     - [k-D Trees](#k-d-trees)
     - [Skip lists](#skip-lists)
     - [Network Flows](#network-flows)
-    - [Disjoint Sets & Union Find](#disjoint-sets--union-find)
     - [Math for Fast Processing](#math-for-fast-processing)
     - [Treap](#treap)
     - [Linear Programming](#linear-programming)
@@ -582,12 +581,8 @@ Write code on a whiteboard or paper, not a computer. Test with some sample input
     - [ ] Description:
         - [Arrays (video)](https://www.coursera.org/learn/data-structures/lecture/OsBSF/arrays)
         - [UCBerkley CS61B - Linear and Multi-Dim Arrays (video)](https://youtu.be/Wp8oiO_CZZE?t=15m32s)
-        - [Basic Arrays (video)](https://archive.org/details/0102WhatYouShouldKnow/02_04-basicArrays.mp4)
-        - [Multi-dim (video)](https://archive.org/details/0102WhatYouShouldKnow/02_05-multidimensionalArrays.mp4)
         - [Dynamic Arrays (video)](https://www.coursera.org/learn/data-structures/lecture/EwbnV/dynamic-arrays)
         - [Jagged Arrays (video)](https://www.youtube.com/watch?v=1jtrQqYpt7g)
-        - [Jagged Arrays (video)](https://archive.org/details/0102WhatYouShouldKnow/02_06-jaggedArrays.mp4)
-        - [Resizing arrays (video)](https://archive.org/details/0102WhatYouShouldKnow/03_01-resizableArrays.mp4)
     - [ ] Implement a vector (mutable array with automatic resizing):
         - [ ] Practice coding using arrays and pointers, and pointer math to jump to an index instead of using indexing.
         - [ ] new raw data array with allocated memory
@@ -649,14 +644,11 @@ Write code on a whiteboard or paper, not a computer. Test with some sample input
 
 - ### Stack
     - [ ] [Stacks (video)](https://www.coursera.org/learn/data-structures/lecture/UdKzQ/stacks)
-    - [ ] [Using Stacks Last-In First-Out (video)](https://archive.org/details/0102WhatYouShouldKnow/05_01-usingStacksForLast-inFirst-out.mp4)
     - [ ] Will not implement. Implementing with array is trivial.
 
 - ### Queue
-    - [ ] [Using Queues First-In First-Out(video)](https://archive.org/details/0102WhatYouShouldKnow/05_03-usingQueuesForFirst-inFirst-out.mp4)
     - [ ] [Queue (video)](https://www.coursera.org/learn/data-structures/lecture/EShpq/queue)
     - [ ] [Circular buffer/FIFO](https://en.wikipedia.org/wiki/Circular_buffer)
-    - [ ] [Priority Queues (video)](https://archive.org/details/0102WhatYouShouldKnow/05_04-priorityQueuesAndDeques.mp4)
     - [ ] Implement using linked-list, with tail pointer:
         - enqueue(value) - adds value at position at tail
         - dequeue() - returns value and removes least recently added element (front)
@@ -683,10 +675,6 @@ Write code on a whiteboard or paper, not a computer. Test with some sample input
         - [ ] [(Advanced) Perfect hashing (video)](https://www.youtube.com/watch?v=N0COwN14gt0&list=PL2B4EEwhKD-NbwZ4ezj7gyc_3yNrojKM9&index=4)
 
     - [ ] Online Courses:
-        - [ ] [Understanding Hash Functions (video)](https://archive.org/details/0102WhatYouShouldKnow/06_02-understandingHashFunctions.mp4)
-        - [ ] [Using Hash Tables (video)](https://archive.org/details/0102WhatYouShouldKnow/06_03-usingHashTables.mp4)
-        - [ ] [Supporting Hashing (video)](https://archive.org/details/0102WhatYouShouldKnow/06_04-supportingHashing.mp4)
-        - [ ] [Language Support Hash Tables (video)](https://archive.org/details/0102WhatYouShouldKnow/06_05-languageSupportForHashTables.mp4)
         - [ ] [Core Hash Tables (video)](https://www.coursera.org/learn/data-structures-optimizing-performance/lecture/m7UuP/core-hash-tables)
         - [ ] [Data Structures (video)](https://www.coursera.org/learn/data-structures/home/week/3)
         - [ ] [Phone Book Problem (video)](https://www.coursera.org/learn/data-structures/lecture/NYZZP/phone-book-problem)
@@ -836,25 +824,6 @@ Write code on a whiteboard or paper, not a computer. Test with some sample input
 
 - For heapsort, see Heap data structure above. Heap sort is great, but not stable.
 
-- [ ] [Sedgewick - Mergesort (5 videos)](https://www.youtube.com/watch?v=4nKwesx_c8E&list=PLe-ggMe31CTeunC6GZHFBmQx7EKtjbGf9)
-    - [ ] [1. Mergesort](https://www.youtube.com/watch?v=4nKwesx_c8E&list=PLe-ggMe31CTeunC6GZHFBmQx7EKtjbGf9&index=1)
-    - [ ] [2. Bottom up Mergesort](https://www.youtube.com/watch?v=HGOIGUYjeyk&list=PLe-ggMe31CTeunC6GZHFBmQx7EKtjbGf9&index=2)
-    - [ ] [3. Sorting Complexity](https://www.youtube.com/watch?v=WvU_mIWo0Ac&index=3&list=PLe-ggMe31CTeunC6GZHFBmQx7EKtjbGf9)
-    - [ ] [4. Comparators](https://www.youtube.com/watch?v=7MvC1kmBza0&index=4&list=PLe-ggMe31CTeunC6GZHFBmQx7EKtjbGf9)
-    - [ ] [5. Stability](https://www.youtube.com/watch?v=XD_5iINB5GI&index=5&list=PLe-ggMe31CTeunC6GZHFBmQx7EKtjbGf9)
-
-- [ ] [Sedgewick - Quicksort (4 videos)](https://www.youtube.com/playlist?list=PLe-ggMe31CTeE3x2-nF1-toca1QpuXwE1)
-    - [ ] [1. Quicksort](https://www.youtube.com/watch?v=5M5A7qPWk84&index=1&list=PLe-ggMe31CTeE3x2-nF1-toca1QpuXwE1)
-    - [ ] [2. Selection](https://www.youtube.com/watch?v=CgVYfSyct_M&index=2&list=PLe-ggMe31CTeE3x2-nF1-toca1QpuXwE1)
-    - [ ] [3. Duplicate Keys](https://www.youtube.com/watch?v=WBFzOYJ5ybM&index=3&list=PLe-ggMe31CTeE3x2-nF1-toca1QpuXwE1)
-    - [ ] [4. System Sorts](https://www.youtube.com/watch?v=rejpZ2htBjE&index=4&list=PLe-ggMe31CTeE3x2-nF1-toca1QpuXwE1)
-
-- [ ] UC Berkeley:
-    - [ ] [CS 61B Lecture 29: Sorting I (video)](https://www.youtube.com/watch?v=EiUvYS2DT6I&list=PL4BBB74C7D2A1049C&index=29)
-    - [ ] [CS 61B Lecture 30: Sorting II (video)](https://www.youtube.com/watch?v=2hTY3t80Qsk&list=PL4BBB74C7D2A1049C&index=30)
-    - [ ] [CS 61B Lecture 32: Sorting III (video)](https://www.youtube.com/watch?v=Y6LOLpxg6Dc&index=32&list=PL4BBB74C7D2A1049C)
-    - [ ] [CS 61B Lecture 33: Sorting V (video)](https://www.youtube.com/watch?v=qNMQ4ly43p4&index=33&list=PL4BBB74C7D2A1049C)
-
 - [ ] [Bubble Sort (video)](https://www.youtube.com/watch?v=P00xJgWzz2c&index=1&list=PL89B61F78B552C1AB)
 - [ ] [Analyzing Bubble Sort (video)](https://www.youtube.com/watch?v=ni_zk257Nqo&index=7&list=PL89B61F78B552C1AB)
 - [ ] [Insertion Sort, Merge Sort (video)](https://www.youtube.com/watch?v=Kg4bqzAqRBM&index=3&list=PLUl4u3cNGP61Oq3tWYp6V_F-5jb5L2iHb)
@@ -1375,32 +1344,6 @@ You'll get more graph practice in Skiena's book (see Books section below) and th
     - [Videos](https://www.youtube.com/watch?v=r4r1DZcx1cM&list=PLmVb1OknmNJuC5POdcDv5oCS7_OUkDgpj&index=22)
 - [ ] Series of 2-5 minutes short subject videos - Michael Sambol (18 videos):
     - [Videos](https://www.youtube.com/channel/UCzDJwLWoYCUQowF_nG3m5OQ)
-- [ ] [Sedgewick Videos - Algorithms I](https://www.youtube.com/user/algorithmscourses/playlists?shelf_id=2&view=50&sort=dd)
-    - [ ] [01. Union-Find](https://www.youtube.com/watch?v=8mYfZeHtdNc&list=PLe-ggMe31CTexoNYnMhbHaWhQ0dvcy43t)
-    - [ ] [02. Analysis of Algorithms](https://www.youtube.com/watch?v=ZN-nFW0mEpg&list=PLe-ggMe31CTf0_bkOhh7sa5uqeppp3Sr0)
-    - [ ] [03. Stacks and Queues](https://www.youtube.com/watch?v=TIC1gappbP8&list=PLe-ggMe31CTe-9jhnj3P_3mmrCh0A7iHh)
-    - [ ] [04. Elementary Sorts](https://www.youtube.com/watch?v=CD2AL6VO0ak&list=PLe-ggMe31CTe_5WhGV0F--7CK8MoRUqBd)
-    - [ ] [05. Mergesort](https://www.youtube.com/watch?v=4nKwesx_c8E&list=PLe-ggMe31CTeunC6GZHFBmQx7EKtjbGf9)
-    - [ ] [06. Quicksort](https://www.youtube.com/watch?v=5M5A7qPWk84&list=PLe-ggMe31CTeE3x2-nF1-toca1QpuXwE1)
-    - [ ] [07. Priority Queues](https://www.youtube.com/watch?v=G9TMe0KC0w0&list=PLe-ggMe31CTducy9LDiGVkdSv0NfiRwn5)
-    - [ ] [08. Elementary Symbol Tables](https://www.youtube.com/watch?v=up_nlilw3ac&list=PLe-ggMe31CTc3a8nKRDxFZZrWrBvkc9SG)
-    - [ ] [09. Balanced Search Trees](https://www.youtube.com/watch?v=qC1BLLPK_5w&list=PLe-ggMe31CTf7jHH_mFT50kayjCEA6Rhu)
-    - [ ] [10. Geometric Applications of BST](https://www.youtube.com/watch?v=Wl30aGAp6TY&list=PLe-ggMe31CTdBsRIw0hXln0hilRs-DqAx)
-    - [ ] [11. Hash Tables](https://www.youtube.com/watch?v=QA8fJGO-i9o&list=PLe-ggMe31CTcKxIRGqqThMts2eHtSrf11)
-- [ ] [Sedgewick Videos - Algorithms II](https://www.youtube.com/user/algorithmscourses/playlists?flow=list&shelf_id=3&view=50)
-    - [ ] [01. Undirected Graphs](https://www.youtube.com/watch?v=GmVhD-mmMBg&list=PLe-ggMe31CTc0zDzANxl4I2MhMoRVlbRM)
-    - [ ] [02. Directed Graphs](https://www.youtube.com/watch?v=_z-JsVaUS40&list=PLe-ggMe31CTcEwaU8a1P1Gd95A77HV85K)
-    - [ ] [03. Minimum Spanning Trees](https://www.youtube.com/watch?v=t8fNk9tfVYY&list=PLe-ggMe31CTceUZxDesGfHGLE7kcSafqj)
-    - [ ] [04. Shortest Paths](https://www.youtube.com/watch?v=HoGSiB7tSeI&list=PLe-ggMe31CTePpG3jbeOTsnGUGZDKxgZD)
-    - [ ] [05. Maximum Flow](https://www.youtube.com/watch?v=rYIKlFstBqE&list=PLe-ggMe31CTduQ68XQ-sVj32wYJIspTma)
-    - [ ] [06. Radix Sorts](https://www.youtube.com/watch?v=HKPrVm5FWvg&list=PLe-ggMe31CTcNvUX9E3tQeM6ntrdR8e53)
-    - [ ] [07. Tries](https://www.youtube.com/watch?v=00YaFPcC65g&list=PLe-ggMe31CTe9IyG9MB8vt5xUJeYgOYRQ)
-    - [ ] [08. Substring Search](https://www.youtube.com/watch?v=QzI0p6zDjK4&list=PLe-ggMe31CTdAdjXB3lIuf2maubzo9t66)
-    - [ ] [09. Regular Expressions](https://www.youtube.com/watch?v=TQWNQsJSPnk&list=PLe-ggMe31CTetTlJWouM42fyttyKPgSDh)
-    - [ ] [10. Data Compression](https://www.youtube.com/watch?v=at9tjpxcBh8&list=PLe-ggMe31CTciifRRo6yY0Yt0mzgIXXVZ)
-    - [ ] [11. Reductions](https://www.youtube.com/watch?v=Ow5x-ooMGv8&list=PLe-ggMe31CTe_yliW5vc3yO-dj1LSSDyF)
-    - [ ] [12. Linear Programming](https://www.youtube.com/watch?v=rWhcLyiLZLA&list=PLe-ggMe31CTdy6dKzMgkWFuTTN1H8B-E1)
-    - [ ] [13. Intractability](https://www.youtube.com/watch?v=6qcaaDp4cdQ&list=PLe-ggMe31CTcZCjluBHw53e_ek2k9Kn-S)
 
 ---
 
@@ -1433,7 +1376,6 @@ Supplemental:
 - [Mathematics for Topcoders](https://www.topcoder.com/community/data-science/data-science-tutorials/mathematics-for-topcoders/)
 - [Dynamic Programming – From Novice to Advanced](https://www.topcoder.com/community/data-science/data-science-tutorials/dynamic-programming-from-novice-to-advanced/)
 - [MIT Interview Materials](https://web.archive.org/web/20160906124824/http://courses.csail.mit.edu/iap/interview/materials.php)
-- [Exercises for getting better at a given language](http://exercism.io/languages)
 
 **Read and Do Programming Problems (in this order):**
 
@@ -1825,10 +1767,6 @@ software engineer, and to be aware of certain technologies and algorithms, so yo
     - [ ] [Ford-Fulkerson Algorithm (video)](https://www.youtube.com/watch?v=v1VgJmkEJW0)
     - [ ] [Network Flows (video)](https://www.youtube.com/watch?v=2vhN4Ice5jI)
 
-- ### Disjoint Sets & Union Find
-    - [ ] [UCB 61B - Disjoint Sets; Sorting & selection (video)](https://www.youtube.com/watch?v=MAEGXTwmUsI&list=PL-XXv-cvA_iAlnI-BQr9hjqADPBtujFJd&index=21)
-    - [ ] [Sedgewick Algorithms - Union-Find (6 videos)](https://www.youtube.com/watch?v=8mYfZeHtdNc&list=PLe-ggMe31CTexoNYnMhbHaWhQ0dvcy43t)
-
 - ### Math for Fast Processing
     - [ ] [Integer Arithmetic, Karatsuba Multiplication (video)](https://www.youtube.com/watch?v=eCaXlAaN2uE&index=11&list=PLUl4u3cNGP61Oq3tWYp6V_F-5jb5L2iHb)
     - [ ] [The Chinese Remainder Theorem (used in cryptography) (video)](https://www.youtube.com/watch?v=ru7mWZJlRQg)

translations/README-ur.md

@@ -533,12 +533,8 @@ Write code on a whiteboard or paper, not a computer. Test with some sample input
     - [ ] Description:
         - [Arrays (video)](https://www.coursera.org/learn/data-structures/lecture/OsBSF/arrays)
         - [UC Berkeley CS61B - Linear and Multi-Dim Arrays (video)](https://archive.org/details/ucberkeley_webcast_Wp8oiO_CZZE) (Start watching from 15m 32s)
-        - [Basic Arrays (video)](https://archive.org/details/0102WhatYouShouldKnow/02_04-basicArrays.mp4)
-        - [Multi-dim (video)](https://archive.org/details/0102WhatYouShouldKnow/02_05-multidimensionalArrays.mp4)
         - [Dynamic Arrays (video)](https://www.coursera.org/learn/data-structures/lecture/EwbnV/dynamic-arrays)
         - [Jagged Arrays (video)](https://www.youtube.com/watch?v=1jtrQqYpt7g)
-        - [Jagged Arrays (video)](https://archive.org/details/0102WhatYouShouldKnow/02_06-jaggedArrays.mp4)
-        - [Resizing arrays (video)](https://archive.org/details/0102WhatYouShouldKnow/03_01-resizableArrays.mp4)
     - [ ] Implement a vector (mutable array with automatic resizing):
         - [ ] Practice coding using arrays and pointers, and pointer math to jump to an index instead of using indexing.
         - [ ] new raw data array with allocated memory
@@ -601,14 +597,11 @@ Write code on a whiteboard or paper, not a computer. Test with some sample input
 
 - ### Stack
     - [ ] [Stacks (video)](https://www.coursera.org/learn/data-structures/lecture/UdKzQ/stacks)
-    - [ ] [Using Stacks Last-In First-Out (video)](https://archive.org/details/0102WhatYouShouldKnow/05_01-usingStacksForLast-inFirst-out.mp4)
     - [ ] Will not implement. Implementing with array is trivial.
 
 - ### Queue
-    - [ ] [Using Queues First-In First-Out(video)](https://archive.org/details/0102WhatYouShouldKnow/05_03-usingQueuesForFirst-inFirst-out.mp4)
     - [ ] [Queue (video)](https://www.coursera.org/lecture/data-structures/queues-EShpq)
     - [ ] [Circular buffer/FIFO](https://en.wikipedia.org/wiki/Circular_buffer)
-    - [ ] [Priority Queues (video)](https://archive.org/details/0102WhatYouShouldKnow/05_04-priorityQueuesAndDeques.mp4)
     - [ ] Implement using linked-list, with tail pointer:
         - enqueue(value) - adds value at position at tail
         - dequeue() - returns value and removes least recently added element (front)
@@ -635,10 +628,6 @@ Write code on a whiteboard or paper, not a computer. Test with some sample input
         - [ ] [(Advanced) Perfect hashing (video)](https://www.youtube.com/watch?v=N0COwN14gt0&list=PL2B4EEwhKD-NbwZ4ezj7gyc_3yNrojKM9&index=4)
 
     - [ ] Online Courses:
-        - [ ] [Understanding Hash Functions (video)](https://archive.org/details/0102WhatYouShouldKnow/06_02-understandingHashFunctions.mp4)
-        - [ ] [Using Hash Tables (video)](https://archive.org/details/0102WhatYouShouldKnow/06_03-usingHashTables.mp4)
-        - [ ] [Supporting Hashing (video)](https://archive.org/details/0102WhatYouShouldKnow/06_04-supportingHashing.mp4)
-        - [ ] [Language Support Hash Tables (video)](https://archive.org/details/0102WhatYouShouldKnow/06_05-languageSupportForHashTables.mp4)
         - [ ] [Core Hash Tables (video)](https://www.coursera.org/learn/data-structures-optimizing-performance/lecture/m7UuP/core-hash-tables)
         - [ ] [Data Structures (video)](https://www.coursera.org/learn/data-structures/home/week/4)
         - [ ] [Phone Book Problem (video)](https://www.coursera.org/learn/data-structures/lecture/NYZZP/phone-book-problem)
@@ -1307,7 +1296,6 @@ Supplemental:
 - [Mathematics for Topcoders](https://www.topcoder.com/community/competitive-programming/tutorials/mathematics-for-topcoders/)
 - [Dynamic Programming – From Novice to Advanced](https://www.topcoder.com/community/competitive-programming/tutorials/dynamic-programming-from-novice-to-advanced/)
 - [MIT Interview Materials](https://web.archive.org/web/20160906124824/http://courses.csail.mit.edu/iap/interview/materials.php)
-- [Exercises for getting better at a given language](http://exercism.io/languages)
 
 **Read and Do Programming Problems (in this order):**
 

translations/README-uz.md

@@ -1282,7 +1282,6 @@ Qo'shimcha:
 - [Mathematics for Topcoders](https://www.topcoder.com/community/competitive-programming/tutorials/mathematics-for-topcoders/)
 - [Dynamic Programming – From Novice to Advanced](https://www.topcoder.com/community/competitive-programming/tutorials/dynamic-programming-from-novice-to-advanced/)
 - [MIT Interview Materials](https://web.archive.org/web/20160906124824/http://courses.csail.mit.edu/iap/interview/materials.php)
-- [Exercises for getting better at a given language](http://exercism.io/languages)
 
 **Dasturlash masalalarini o'qing va bajaring (ketma ketlikda):**
 

translations/README-vi.md

@@ -189,7 +189,6 @@ Thêm vào đó, nếu bạn muốn trở thành một kỹ sư hệ thống (Sy
     - [k-D Trees](#k-d-trees)
     - [Skip lists](#skip-lists)
     - [Network Flows](#network-flows)
-    - [Disjoint Sets & Union Find](#disjoint-sets--union-find)
     - [Math for Fast Processing](#math-for-fast-processing)
     - [Treap](#treap)
     - [Linear Programming](#linear-programming)
@@ -572,12 +571,8 @@ Hãy viết code trên bảng đen hoặc trên giấy. Đừng sử dụng máy
     - [ ] Miêu tả, tên gốc được giữ nguyên kèm với bản dịch sang tiếng Việt:
         - [Arrays - Mảng (video)](https://www.coursera.org/learn/data-structures/lecture/OsBSF/arrays)
         - [UCBerkley CS61B - Linear and Multi-Dim Arrays - Mảng tuyến tính và mảng đa chiều(video)](https://youtu.be/Wp8oiO_CZZE?t=15m32s)
-        - [Basic Arrays - Mảng cơ bản (video)](https://archive.org/details/0102WhatYouShouldKnow/02_04-basicArrays.mp4)
-        - [Multi-dim - Đa chiều(video)](https://archive.org/details/0102WhatYouShouldKnow/02_05-multidimensionalArrays.mp4)
         - [Dynamic Arrays - Mảng tùy biến (video)](https://www.coursera.org/learn/data-structures/lecture/EwbnV/dynamic-arrays)
         - [Jagged Arrays - Mảng trong mảng (video)](https://www.youtube.com/watch?v=1jtrQqYpt7g)
-        - [Jagged Arrays - Mảng trong mảng (video)](https://archive.org/details/0102WhatYouShouldKnow/02_06-jaggedArrays.mp4)
-        - [Resizing arrays - Mảng có thể tùy biến kích thước (video)](https://archive.org/details/0102WhatYouShouldKnow/03_01-resizableArrays.mp4)
     - [ ] Cấp phát vector (Mảng có thể thay đổi với khả năng tự điều chỉnh kích cỡ):
         - [ ] Tập sử dụng mảng và con trỏ, dùng phép toán con trỏ để nhảy tới một chỉ mục (index) thay vì sử dụng chỉ mục.
         - [ ] Tạo mảng mới với vùng nhớ được cấp phát sẵn
@@ -639,14 +634,11 @@ Hãy viết code trên bảng đen hoặc trên giấy. Đừng sử dụng máy
 
 - ### Stack
     - [ ] [Stacks (video)](https://www.coursera.org/learn/data-structures/lecture/UdKzQ/stacks)
-    - [ ] [Using Stacks Last-In First-Out - Sử dụng stack Vào-Cuối-Ra-Trước (video)](https://archive.org/details/0102WhatYouShouldKnow/05_01-usingStacksForLast-inFirst-out.mp4)
     - [ ] Sẽ không cài đặt. Cài đặt với mảng là điều hiển nhiên.
 
 - ### Queue
-    - [ ] [Using Queues First-In First-Out -  Sử dụng hàng đợi Vào-Trước-Ra-Trước(video)](https://archive.org/details/0102WhatYouShouldKnow/05_03-usingQueuesForFirst-inFirst-out.mp4)
     - [ ] [Queue (video)](https://www.coursera.org/learn/data-structures/lecture/EShpq/queue)
     - [ ] [Circular buffer/FIFO](https://en.wikipedia.org/wiki/Circular_buffer)
-    - [ ] [Priority Queues - Hàng đợi ưu tiên (video)](https://archive.org/details/0102WhatYouShouldKnow/05_04-priorityQueuesAndDeques.mp4)
     - [ ] Cài đặt sử dụng danh sách liên kết, áp dụng con trỏ đuôi:
         - enqueue(value) - Thêm giá trị ở đuôi
         - dequeue() - Trả về giá trị của dữ liệu được thêm vào xa nhất (thông thường là dữ liệu đầu tiên trong danh sách)
@@ -671,10 +663,6 @@ Hãy viết code trên bảng đen hoặc trên giấy. Đừng sử dụng máy
         - [ ] [(Advanced) Randomization: Universal & Perfect Hashing (video)](https://www.youtube.com/watch?v=z0lJ2k0sl1g&list=PLUl4u3cNGP6317WaSNfmCvGym2ucw3oGp&index=11)
         - [ ] [(Advanced) Perfect hashing (video)](https://www.youtube.com/watch?v=N0COwN14gt0&list=PL2B4EEwhKD-NbwZ4ezj7gyc_3yNrojKM9&index=4)
     - [ ] Các khóa học online:
-        - [ ] [Understanding Hash Functions - Hiểu hàm băm (video)](https://archive.org/details/0102WhatYouShouldKnow/06_02-understandingHashFunctions.mp4)
-        - [ ] [Using Hash Tables - Sử dụng bảng băm (video)](https://archive.org/details/0102WhatYouShouldKnow/06_03-usingHashTables.mp4)
-        - [ ] [Supporting Hashing - Hỗ trợ băm(video)](https://archive.org/details/0102WhatYouShouldKnow/06_04-supportingHashing.mp4)
-        - [ ] [Language Support Hash Tables - Ngôn ngữ hỗ trợ bảng băm (video)](https://archive.org/details/0102WhatYouShouldKnow/06_05-languageSupportForHashTables.mp4)
         - [ ] [Core Hash Tables - Cơ bản về bảng băm (video)](https://www.coursera.org/learn/data-structures-optimizing-performance/lecture/m7UuP/core-hash-tables)
         - [ ] [Data Structures - Cấu trúc dữ liệu (video)](https://www.coursera.org/learn/data-structures/home/week/3)
         - [ ] [Phone Book Problem - Vấn đề sổ điện thoại (video)](https://www.coursera.org/learn/data-structures/lecture/NYZZP/phone-book-problem)
@@ -828,25 +816,6 @@ Hãy viết code trên bảng đen hoặc trên giấy. Đừng sử dụng máy
 
 - Với sắp xếp vun đống (Heapsort), xem lại see cấu trúc Heap ở trên. Sắp xếp vun đống tốt, nhưng không ổn định.
 
-- [ ] [Sedgewick - Mergesort (5 videos)](https://www.youtube.com/watch?v=4nKwesx_c8E&list=PLe-ggMe31CTeunC6GZHFBmQx7EKtjbGf9)
-    - [ ] [1. Mergesort](https://www.youtube.com/watch?v=4nKwesx_c8E&list=PLe-ggMe31CTeunC6GZHFBmQx7EKtjbGf9&index=1)
-    - [ ] [2. Sắp xếp trộn từ dưới lên (Bottom up Mergesort)](https://www.youtube.com/watch?v=HGOIGUYjeyk&list=PLe-ggMe31CTeunC6GZHFBmQx7EKtjbGf9&index=2)
-    - [ ] [3. Độ phức tạp của các thuật toán sắp xếp (Sorting Complexity)](https://www.youtube.com/watch?v=WvU_mIWo0Ac&index=3&list=PLe-ggMe31CTeunC6GZHFBmQx7EKtjbGf9)
-    - [ ] [4. Các hàm so sánh (Comparators)](https://www.youtube.com/watch?v=7MvC1kmBza0&index=4&list=PLe-ggMe31CTeunC6GZHFBmQx7EKtjbGf9)
-    - [ ] [5. Tính ổn định (Stability)](https://www.youtube.com/watch?v=XD_5iINB5GI&index=5&list=PLe-ggMe31CTeunC6GZHFBmQx7EKtjbGf9)
-
-- [ ] [Sedgewick - Quicksort (4 videos)](https://www.youtube.com/playlist?list=PLe-ggMe31CTeE3x2-nF1-toca1QpuXwE1)
-    - [ ] [1. Quicksort](https://www.youtube.com/watch?v=5M5A7qPWk84&index=1&list=PLe-ggMe31CTeE3x2-nF1-toca1QpuXwE1)
-    - [ ] [2. Cách chọn (Selection)](https://www.youtube.com/watch?v=CgVYfSyct_M&index=2&list=PLe-ggMe31CTeE3x2-nF1-toca1QpuXwE1)
-    - [ ] [3. Lặp khóa (Duplicate Keys)](https://www.youtube.com/watch?v=WBFzOYJ5ybM&index=3&list=PLe-ggMe31CTeE3x2-nF1-toca1QpuXwE1)
-    - [ ] [4. Các hệ thống sắp xếp (System Sorts)](https://www.youtube.com/watch?v=rejpZ2htBjE&index=4&list=PLe-ggMe31CTeE3x2-nF1-toca1QpuXwE1)
-
-- [ ] UC Berkeley (chuỗi video bài giảng):
-    - [ ] [CS 61B Lecture 29: Sorting I (video)](https://www.youtube.com/watch?v=EiUvYS2DT6I&list=PL4BBB74C7D2A1049C&index=29)
-    - [ ] [CS 61B Lecture 30: Sorting II (video)](https://www.youtube.com/watch?v=2hTY3t80Qsk&list=PL4BBB74C7D2A1049C&index=30)
-    - [ ] [CS 61B Lecture 32: Sorting III (video)](https://www.youtube.com/watch?v=Y6LOLpxg6Dc&index=32&list=PL4BBB74C7D2A1049C)
-    - [ ] [CS 61B Lecture 33: Sorting V (video)](https://www.youtube.com/watch?v=qNMQ4ly43p4&index=33&list=PL4BBB74C7D2A1049C)
-
 - [ ] [Sắp xếp nổi bọt (Bubble Sort) - video](https://www.youtube.com/watch?v=P00xJgWzz2c&index=1&list=PL89B61F78B552C1AB)
 - [ ] [Phân tích thuật toán sắp xếp nổi bọt (Analyzing Bubble Sort) - video](https://www.youtube.com/watch?v=ni_zk257Nqo&index=7&list=PL89B61F78B552C1AB)
 - [ ] [Sắp xếp chèn và sắp xếp trộn (Insertion Sort, Merge Sort) - video](https://www.youtube.com/watch?v=Kg4bqzAqRBM&index=3&list=PLUl4u3cNGP61Oq3tWYp6V_F-5jb5L2iHb)
@@ -1363,32 +1332,6 @@ Bạn sẽ biết thêm nhiều ứng dụng của đồ thị trong sách của
     - [Videos](https://www.youtube.com/watch?v=r4r1DZcx1cM&list=PLmVb1OknmNJuC5POdcDv5oCS7_OUkDgpj&index=22)
 - [ ] Các video ngắn 2-5 phút - Michael Sambol (18 video)
     - [Videos](https://www.youtube.com/channel/UCzDJwLWoYCUQowF_nG3m5OQ)
-- [ ] [Sedgewick Videos - Thuật toán I](https://www.youtube.com/user/algorithmscourses/playlists?shelf_id=2&view=50&sort=dd)
-    - [ ] [01. Union-Find](https://www.youtube.com/watch?v=8mYfZeHtdNc&list=PLe-ggMe31CTexoNYnMhbHaWhQ0dvcy43t)
-    - [ ] [02. Analysis of Algorithms](https://www.youtube.com/watch?v=ZN-nFW0mEpg&list=PLe-ggMe31CTf0_bkOhh7sa5uqeppp3Sr0)
-    - [ ] [03. Stacks and Queues](https://www.youtube.com/watch?v=TIC1gappbP8&list=PLe-ggMe31CTe-9jhnj3P_3mmrCh0A7iHh)
-    - [ ] [04. Elementary Sorts](https://www.youtube.com/watch?v=CD2AL6VO0ak&list=PLe-ggMe31CTe_5WhGV0F--7CK8MoRUqBd)
-    - [ ] [05. Mergesort](https://www.youtube.com/watch?v=4nKwesx_c8E&list=PLe-ggMe31CTeunC6GZHFBmQx7EKtjbGf9)
-    - [ ] [06. Quicksort](https://www.youtube.com/watch?v=5M5A7qPWk84&list=PLe-ggMe31CTeE3x2-nF1-toca1QpuXwE1)
-    - [ ] [07. Priority Queues](https://www.youtube.com/watch?v=G9TMe0KC0w0&list=PLe-ggMe31CTducy9LDiGVkdSv0NfiRwn5)
-    - [ ] [08. Elementary Symbol Tables](https://www.youtube.com/watch?v=up_nlilw3ac&list=PLe-ggMe31CTc3a8nKRDxFZZrWrBvkc9SG)
-    - [ ] [09. Balanced Search Trees](https://www.youtube.com/watch?v=qC1BLLPK_5w&list=PLe-ggMe31CTf7jHH_mFT50kayjCEA6Rhu)
-    - [ ] [10. Geometric Applications of BST](https://www.youtube.com/watch?v=Wl30aGAp6TY&list=PLe-ggMe31CTdBsRIw0hXln0hilRs-DqAx)
-    - [ ] [11. Hash Tables](https://www.youtube.com/watch?v=QA8fJGO-i9o&list=PLe-ggMe31CTcKxIRGqqThMts2eHtSrf11)
-- [ ] [Sedgewick Videos - Thuật toán II](https://www.youtube.com/user/algorithmscourses/playlists?flow=list&shelf_id=3&view=50)
-    - [ ] [01. Undirected Graphs](https://www.youtube.com/watch?v=GmVhD-mmMBg&list=PLe-ggMe31CTc0zDzANxl4I2MhMoRVlbRM)
-    - [ ] [02. Directed Graphs](https://www.youtube.com/watch?v=_z-JsVaUS40&list=PLe-ggMe31CTcEwaU8a1P1Gd95A77HV85K)
-    - [ ] [03. Minimum Spanning Trees](https://www.youtube.com/watch?v=t8fNk9tfVYY&list=PLe-ggMe31CTceUZxDesGfHGLE7kcSafqj)
-    - [ ] [04. Shortest Paths](https://www.youtube.com/watch?v=HoGSiB7tSeI&list=PLe-ggMe31CTePpG3jbeOTsnGUGZDKxgZD)
-    - [ ] [05. Maximum Flow](https://www.youtube.com/watch?v=rYIKlFstBqE&list=PLe-ggMe31CTduQ68XQ-sVj32wYJIspTma)
-    - [ ] [06. Radix Sorts](https://www.youtube.com/watch?v=HKPrVm5FWvg&list=PLe-ggMe31CTcNvUX9E3tQeM6ntrdR8e53)
-    - [ ] [07. Tries](https://www.youtube.com/watch?v=00YaFPcC65g&list=PLe-ggMe31CTe9IyG9MB8vt5xUJeYgOYRQ)
-    - [ ] [08. Substring Search](https://www.youtube.com/watch?v=QzI0p6zDjK4&list=PLe-ggMe31CTdAdjXB3lIuf2maubzo9t66)
-    - [ ] [09. Regular Expressions](https://www.youtube.com/watch?v=TQWNQsJSPnk&list=PLe-ggMe31CTetTlJWouM42fyttyKPgSDh)
-    - [ ] [10. Data Compression](https://www.youtube.com/watch?v=at9tjpxcBh8&list=PLe-ggMe31CTciifRRo6yY0Yt0mzgIXXVZ)
-    - [ ] [11. Reductions](https://www.youtube.com/watch?v=Ow5x-ooMGv8&list=PLe-ggMe31CTe_yliW5vc3yO-dj1LSSDyF)
-    - [ ] [12. Linear Programming](https://www.youtube.com/watch?v=rWhcLyiLZLA&list=PLe-ggMe31CTdy6dKzMgkWFuTTN1H8B-E1)
-    - [ ] [13. Intractability](https://www.youtube.com/watch?v=6qcaaDp4cdQ&list=PLe-ggMe31CTcZCjluBHw53e_ek2k9Kn-S)
 
 ---
 
@@ -1421,7 +1364,6 @@ Phụ lục:
 - [Toán học cho nhà lập trình hàng đầu (Mathematics for Topcoders)](https://www.topcoder.com/community/data-science/data-science-tutorials/mathematics-for-topcoders/)
 - [Quy hoạch động - Từ cơ bản đến nâng cao (Dynamic Programming – From Novice to Advanced)](https://www.topcoder.com/community/data-science/data-science-tutorials/dynamic-programming-from-novice-to-advanced/)
 - [Các tài liệu liên quan tới phỏng vấn của MIT (MIT Interview Materials)](https://web.archive.org/web/20160906124824/http://courses.csail.mit.edu/iap/interview/materials.php)
-- [Các bài tập để lập trình tốt hơn đối với ngôn ngữ được lựa chọn (Exercises for getting better at a given language)](http://exercism.io/languages)
 
 **Đọc và làm các bài tập về lập trình (theo thứ tự sau):**
 
@@ -1785,10 +1727,6 @@ Bạn không bao giờ thực sự học xong!
     - [ ] [Ford-Fulkerson Algorithm (video)](https://www.youtube.com/watch?v=v1VgJmkEJW0)
     - [ ] [Network Flows (video)](https://www.youtube.com/watch?v=2vhN4Ice5jI)
 
-- ### Disjoint Sets & Union Find
-    - [ ] [UCB 61B - Disjoint Sets; Sorting & selection (video)](https://www.youtube.com/watch?v=MAEGXTwmUsI&list=PL-XXv-cvA_iAlnI-BQr9hjqADPBtujFJd&index=21)
-    - [ ] [Sedgewick Algorithms - Union-Find (6 videos)](https://www.youtube.com/watch?v=8mYfZeHtdNc&list=PLe-ggMe31CTexoNYnMhbHaWhQ0dvcy43t)
-
 - ### Math for Fast Processing
     - [ ] [Integer Arithmetic, Karatsuba Multiplication (video)](https://www.youtube.com/watch?v=eCaXlAaN2uE&index=11&list=PLUl4u3cNGP61Oq3tWYp6V_F-5jb5L2iHb)
     - [ ] [The Chinese Remainder Theorem (used in cryptography) (video)](https://www.youtube.com/watch?v=ru7mWZJlRQg)