昨日明眸

二分图最大匹配(匈牙利算法）   （1）前提说明：（用到的定义说明） 1。二部图：   如果图G=(V,E)的顶点集何V可分为两个集合X,Y，且满足 X∪Y = V, X∩Y=Φ，则G称为二部图；图G的边集用E(G)表示，点集用V(G)表示。 2。匹配：   设M是E(G)的一个子集，如果M中任意两条边在G中均不邻接，则称M是G的一个匹配。M中的—条边的两个端点叫做在

过山车 Time Limit: 1000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 18735    Accepted Submission(s): 8174 Problem Description RPG girls今天和大家一起去游乐场玩，终于可

Ollivanders: Makers of Fine Wands since 382 BC. Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 131072/65536 K (Java/Others) Total Submission(s): 1485    Accepted Submission(s): 823 Pro

Contest - 多校训练（三） Problem E: G Time Limit: 1 Sec  Memory Limit: 128 MB Submit: 329  Solved: 70 SubmitStatusWeb Board Description 晴天也来寻宝啦，有一个m层的宝塔，只能从第一层开始一层一层的往上走，每层都有一个门，你需要用钥匙来打开

Description Bessie wants to navigate her spaceship through a dangerous asteroid field in the shape of an N x N grid (1 <= N <= 500). The grid contains K asteroids (1 <= K <= 10,000), which are conven