A curated list of awesome places to learn and/or practice algorithms.
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Websites you should use to learn classic algorithms
Free and High Quality Courses Online
Algorithms: Divide and Conquer, Sorting and Searching, and Randomized Algorithms - The primary topics are: asymptotic ("Big-oh") notation, sorting and searching, divide and conquer, and randomized algorithms.
Algorithms: Graph Search, Shortest Paths, and Data Structures - The primary topics are: data structures, graph primitives, and their applications.
Algorithms: Greedy Algorithms, Minimum Spanning Trees, and Dynamic Programming - The primary topics are: greedy algorithms and dynamic programming.
Algorithms: Shortest Paths Revisited, NP-Complete Problems and What To Do About Them - The primary topics are: shortest paths, NP-completeness and what it means for the algorithm designer, and strategies for coping with computationally intractable problems.
Algorithms, Part I - This course covers the essential information that every serious programmer needs to know about algorithms and data structures.Part I covers elementary data structures, sorting, and searching algorithms.
Algorithms, Part II - Part II focuses on graph- and string-processing algorithms.
Khan Academy Algorithms - Algorithm course ministred by Tomas Cormen and Devin Balkcom.
MIT - 6-006 - Well explained algorithms.
MIT - 6-046j - Similar to the previous one, but with different algorithms.
MIT - 6-00sc - An easy and well explained introduction to algorithms.
Udacity Intro to Algorithms - Python-based Algorithms course.
Algorithms in Motion - Beginner's algorithms course with fun illustrations, based on the book Grokking Algorithms
YogiBearian YouTube Channel - Lots of well explained vidoes on various computer science subjects. Account terminated due to violations of Youtube Policies.
The most highly regarded books to learn algorithms
Implementations of the most classic algorithms in a wide variety of programming languages
Online Judges to practice what you learned above
A2 Online Judge - Online Judge and problem archive.
ACM-ICPC Live Archive - Hundreds of problems from previous ACM-ICPC Regionals and World Finals.
AIZU ONLINE JUDGE - Japanese Online Judge.
CS Academy - Holds online contests and IOI practice contests
CodeChef - More problems and monthly online contests.
Codeforces - The only programming contests Web 2.0 platform
CodeMarshal - Real world contests online!
CodeWars - A website that houses support to solve algorithms in many languages in varying difficulty.
HackerEarth - Practice alogrithmic problems & challenges and participate in hiring challenges.
HackerRank - Featured algorithm and functional programming online judges
Infoarena - Romanian Online Judge. 1500+ algorithmic problems
Kattis- Online judge and problem archive
LavidaOnlineJudge - Korean Online Judge(Half English). 1300+ problems.
Learneroo Algorithms Tutorials - Learn and practice algorithms by solving challenges online.
LeetCode - Learn algorithms and prepare for interviews.
PKU JudgeOnline - Chinese Online Judge.
ProjectEuler - Mathematical problems that can be solved using algorithms (or just a pencil, depends on how much you already know).
Rosalind - A platform for learning bioinformatics and programming through problem solving.
ShareCode.io - Online Judge and contest host with a lot of algorithmic problems in the archive to practice.
Snakify - An introductory Python course with 100+ algorithmic problems and a step-by-step debugger (from Russia).
SPOJ - More problems.
TopCoder - Lots of problems and real world/money worthy problems in Graphic Design, Data Science and Development.
Toph - Sport programming platform for online contests. It also has a growing problem archive.
URI - Brazilian Online Judge. Not so much problems, but it's growing and it has online contests.
UVA - Hundreds of problems (from previous ACM-ICPC Regionals, World Finals and others).
Some tools that can help you in the learning of algorithms
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