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...

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 $ n\times m grids. There is one positive integer on each grid. Now you can take the numbers fro...

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 $ N$ vertices and $ M$ arcs. After that Bob tries to destr...

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...