userluoxuan的专栏

解题思路： 这题一开始以为是最短路类型的，后来发现，

解题报告：

解题思路： 题目大意就是一个人只能走黑格子不能走红格子，

Description Given a set of sticks of various lengths, is it possible to join them end-to-end to form a square?    Input The first line of input contains N, the number of test cases.

解题思路： 题目大意是翻转一枚硬币，则

Description Due to recent rains, water has pooled in various places in Farmer John's field, which is represented by a rectangle of N x M (1 <= N <= 100; 1 <= M <= 100) squares. Each square contai