Problem Description There is a grid with N rows and M columns. In each cell you can choose to put a golden or silver egg in it, or just leave it empty. If you put an egg in the cell, you wi...

Description In an effort to better manage the grazing patterns of his cows, Farmer John has installed one-way cow paths all over his farm. The farm consists of N fields, conveniently number...

有一点点练码力吧……但是分块思维还是很重要的。 题目背景 亲爱的哥哥： 你在那个城市里面过得好吗？ 我在家里面最近很开心呢。昨天晚上奶奶给我讲了那个叫「绝望」的大坏蛋的故事的说！它把人...

需要证明一个结论。然后灵活运用最大权闭合子图。 Description You’ve finally got mad at “the world’s most stupid” employees of yours and decided to do some firings. You’re now simply too mad ...

最大权闭合子图的理解。 Problem Description 由于小白同学近期习武十分刻苦，很快被晋升为天策军的统帅。而他上任的第一天，就面对了一场极其困难的战斗： 据侦查兵回报，前方共有N座城池，考虑到...

最大权闭合子图的理解。 Problem Description 由于小白同学近期习武十分刻苦，很快被晋升为天策军的统帅。而他上任的第一天，就面对了一场极其困难的战斗： 据侦查兵回报，前方共有N座城池，考虑到...

最小点权覆盖集的题做起来还是挺有意思的。 Problem Description onmylove has invented a game on $latex n\times m grids. There is one positive integer on each grid. Now you can take the number...

这个题的主要难点是最小割输出方案。 Description Alice and Bob play the following game. First, Alice draws some directed graph with $latex N$ vertices and $latex M$ arcs. After that Bob trie...

很适合用来练习最小点权覆盖集的一个题。 Description It is year 2500 A.D. and there is a terrible war between the forces of the Earth and the Mars. Recently, the commanders of the Earth are ...

学到了方格图上的一种建模方向。 题目描述 在一个有 m*n 个方格的棋盘中，每个方格中有一个正整数。现要从方格中取数，使任意 2 个数所在方格没有公共边，且取出的数的总和最大。试设计一个满足要求的取...