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摘要： 链接: https://vjudge.net/problem/HYSBZ 4033 题意: 有一棵点数为N的树，树边有边权。给你一个在0~N之内的正整数K，你要在这棵树中选择K个点，将其染成黑色，并 将其他的N K个点染成白色。将所有点染色后，你会获得黑点两两之间的距离加上白点两两之间距离的和的收益 阅读全文

摘要： 链接: https://vjudge.net/problem/CodeForces 916C 题意: Jamie has recently found undirected weighted graphs with the following properties very interesting: 阅读全文

摘要： 链接: https://vjudge.net/problem/CodeForces 916B 题意: Jamie is preparing a Codeforces round. He has got an idea for a problem, but does not know how to s 阅读全文

摘要： 链接: https://vjudge.net/problem/CodeForces 916A 题意: Jamie loves sleeping. One day, he decides that he needs to wake up at exactly hh: mm. However, he h 阅读全文

摘要： 链接: https://vjudge.net/problem/CodeForces 721D 题意: Recently Maxim has found an array of n integers, needed by no one. He immediately come up with idea 阅读全文

摘要： 链接: https://vjudge.net/problem/CodeForces 721C 题意: Recently Irina arrived to one of the most famous cities of Berland — the Berlatov city. There are n 阅读全文

摘要： 链接: https://vjudge.net/problem/CodeForces 721B 题意: Vanya is managed to enter his favourite site Codehorses. Vanya uses n distinct passwords for sites 阅读全文

摘要： 链接: https://vjudge.net/problem/CodeForces 721A 题意: Recently Adaltik discovered japanese crosswords. Japanese crossword is a picture, represented as a 阅读全文

摘要： 链接: https://vjudge.net/problem/HDU 4803 题意: Jenny is a warehouse keeper. He writes down the entry records everyday. The record is shown on a screen, a 阅读全文

摘要： 链接: https://vjudge.net/problem/HDU 4810 题意: Ms.Fang loves painting very much. She paints GFW(Great Funny Wall) every day. Every day before painting, s 阅读全文