题量统计网站 https://new.npuacm.info/
- VJ https://vjudge.net/（涵盖很多OJ）
- UVA https://uva.onlinejudge.org/
- CF https://codeforces.com/
- CODEVS https://codevs.cn/
- 洛谷 https://www.luogu.org/
- 51NOD https://www.51nod.com/index.html
- Leetcode https://leetcode.com/
- Leetcode中文 https://leetcode-cn.com/
- LintCode https://www.lintcode.com/
- 牛客网 https://www.nowcoder.com/
- 赛码网 https://www.acmcoder.com/index
- HankRank https://www.hackerrank.com/
一个比较牛逼的coding challenge网站 - Topcoder https://www.topcoder.com/
- GCJ https://code.google.com/codejam/ （需Gmail登录）
- hihoCoder https://hihocoder.com/
- SPOJ https://www.spoj.com/