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http://codeforces.com/problemset/problem/935/B Two neighboring kingdoms decided to build a wall between them with some gates to enable the citizens to 阅读全文
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http://codeforces.com/problemset/problem/936/B Petya and Vasya arranged a game. The game runs by the following rules. Players have a directed graph co 阅读全文
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http://codeforces.com/problemset/problem/937/B The weather is fine today and hence it's high time to climb the nearby pine and enjoy the landscape. Th 阅读全文
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http://codeforces.com/problemset/problem/940/B Right now she actually isn't. But she will be, if you don't solve this problem. You are given integers 阅读全文
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Description In the Fibonacci integer sequence, F0 = 0, F1 = 1, and Fn = Fn − 1 + Fn − 2 for n ≥ 2. For example, the first ten terms of the Fibonacci s 阅读全文