Useful links
Table of contents
Online judges
- https://codeforces.com/
- https://atcoder.jp/
- https://vjudge.net
- http://usaco.org
- http://hsin.hr/coci
- https://szkopul.edu.pl
- http://orac.amt.edu.au/cgi-bin/train/hub.pl
- https://dmoj.ca
- http://acm.timus.ru
- https://www.acmicpc.net
- https://www.ioi-jp.org
- https://csacademy.com
- https://www.spoj.com
- https://oj.uz
- https://open.kattis.com
- http://judge.u-aizu.ac.jp/onlinejudge
- http://noi.ac
- http://uoj.ac
- https://www.hackerrank.com
- https://www.codechef.com
Learning resources
- http://cp-algorithms.com
- https://visualgo.net/en
- Competitive Programmer’s Handbook by Antti Laaksonen
- https://github.com/bqi343/USACO