逃生 Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 657 Accepted Submission(s): 178 Problem Description 糟糕的事情发生啦,现在大家都忙着逃命。但是逃命的通道很窄,大家只能
//// main.cpp// HDU 4857 拓扑排序//// Created by 郑喆君 on 8/9/14.// Copyright (c) 2014 itcast. All rights reserved.//#include<cstdio>#include<cstring>#include<iostream>#include<iomanip>#includ
给定点的先后出场次序:例如 点 u 出场的前提是点 v 已经出现,那么这就代表了一个约束条件,现在给出很多的约束条件,用程序来给这些点的出场次序排个序,要求满足所有的约束条件问题,这时候用到的就是拓扑排序。 拓扑排序用于有向无环图,如果过要是想判断一个有向图是否存在环,可以使用拓扑排序进行判断(如果提取入度为0的点的个数没有达到所有点的个数,那么就一定出现环了) 有关拓扑排序的输出问题:
第一次跳坑 POJ 3687 Labeling Balls Description Windy has N balls of distinct weights from 1 unit to N units. Now he tries to label them with 1 to N in such a way that: No two balls share the same label
逃生 Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 4142 Accepted Submission(s): 1148 Problem Description 糟糕的事情发生啦,现在大家都忙着逃命。但是逃
逃生 Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 2392 Accepted Submission(s): 668 Problem Description 糟糕的事情发生啦,现在
拓扑排序。 反向建边。 为了序号小的尽量在前面,我们每次都取出入度为0的最大的点。 #include<stdio.h>#include<algorithm>#include<iostream>#include<stdlib.h>#include<vector>#include<queue>#include<string.h>#include<math.h>using na