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题目来源： http://codeforces.com/problemset/problem/743/B Chloe, the same as Vladik, is a competitive programmer. She didn't have any problems to get to th 阅读全文
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参考博客：最大流问题 https://www.cnblogs.com/fzl194/p/8855101.html 阅读全文
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题目来源：http://codeforces.com/problemset/problem/514/A Luke Skywalker gave Chewbacca an integer number x. Chewbacca isn't good at numbers but he loves in 阅读全文
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题目来源：http://codeforces.com/contest/4/problem/C A new e-mail service "Berlandesk" is going to be opened in Berland in the near future. The site adminis 阅读全文
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题目来源：http://codeforces.com/problemset/problem/339/B Xenia lives in a city that has n houses built along the main ringroad. The ringroad houses are num 阅读全文
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题目来源：http://codeforces.com/problemset/problem/230/A Kirito is stuck on a level of the MMORPG he is playing now. To move on in the game, he's got to de 阅读全文
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题目来源：http://codeforces.com/problemset/problem/479/A Petya studies in a school and he adores Maths. His class has been studying arithmetic expressions. 阅读全文
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题目来源：http://codeforces.com/problemset/problem/131/A wHAT DO WE NEED cAPS LOCK FOR? Caps lock is a computer keyboard key. Pressing it sets an input mod 阅读全文
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题目来源：http://codeforces.com/contest/158/problem/B After the lessons n groups of schoolchildren went outside and decided to visit Polycarpus to celebrat 阅读全文
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题目来源：http://codeforces.com/problemset/problem/110/A Petya loves lucky numbers. We all know that lucky numbers are the positive integers whose decimal 阅读全文