团队队员常用：
Codeforces http://codeforces.com/ problemset
牛客网 https://www.nowcoder.com/ta/acm-training/
刷题链接:
http://poj.org/poj
http://www.spoj.com/
http://acm.hdu.edu.cn/hdu
https://cn.vjudge.net/vj(包含大部分网站的题库)
http://www.51nod.com51Nod (算法较强)
比赛链接
http://acmicpc.info/
https://www.51nod.com/contest/contestList.html
http://bestcoder.hdu.edu.cn/bc
http://www.jisuanke.com/
计蒜客
http://codeforces.com/cf
https://www.topcoder.com/
https://hihocoder.com/contests