Resources

Platforms and competitions

• Competitive Programming
  • https://codeforces.com - in russian and english
  • https://atcoder.jp/home - in japanese and english
  • https://www.codechef.com
• Learn some Programming Language
  • https://exercism.org
  • https://www.hackerrank.com
  • https://www.codewars.com
• Interview Questions
  • https://leetcode.com
  • https://www.lintcode.com
  • https://open.kattis.com
  • https://practice.geeksforgeeks.org/
  • https://www.hackerearth.com
  • https://www.interviewbit.com
• Online Judges
  • https://onlinejudge.org also called UVa - https://en.wikipedia.org/wiki/UVa_Online_Judge
  • https://www.spoj.com - also have vast problems library and programming language support
  • https://acm.timus.ru
• Mathematics
  • https://projecteuler.net/
  • https://cses.fi/problemset/

Visualizations

Visualizations help us to understand algorithms and data structures in a more intuitive way.

• https://visualgo.net/en
• https://www.cs.usfca.edu/~galles/visualization/Algorithms.html
• https://github.com/algorithm-visualizer/algorithm-visualizer

Cheat Sheets

• https://github.com/TheAlgorithms - algorithms implemented in almost all programming languages
• https://cooervo.github.io/Algorithms-DataStructures-BigONotation/

Books

• https://jeffe.cs.illinois.edu/teaching/algorithms/