正文
online contest
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http://atcoder.jp/contest
https://nanti.jisuanke.com/contest
http://codeforces.com/
https://www.nowcoder.com/acm/contest/vip-index
https://www.lydsy.com/JudgeOnline/problemset.php
https://csacademy.com/contests/
https://www.luogu.org/contest/lists
