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题目链接:https://nanti.jisuanke.com/t/31454 In a world where ordinary people cannot reach, a boy named "Koutarou" and a girl named "Sena" are playing a vi 阅读全文
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题目链接:https://vjudge.net/problem/POJ-1655 Consider a tree T with N (1 <= N <= 20,000) nodes numbered 1...N. Deleting any node from the tree yields a fo 阅读全文
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题目链接:https://vjudge.net/problem/HDU-1520 There is going to be a party to celebrate the 80-th Anniversary of the Ural State University. The University 阅读全文