题目链接：http://codeforces.com/problemset/problem/76/F Read more
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Apr 14, 2018
题目链接：http://codeforces.com/problemset/problem/367/C Read more
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Feb 10, 2018
题目链接：http://codeforces.com/problemset/problem/686/D Read more
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题目链接：http://acm.sgu.ru/problem.php?contest=0&problem=189 Read more
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Feb 8, 2018