Description Have you ever read any book about treasure exploration? Have you ever see any film about treasure exploration? Have you ever explored treasure? If you never have such experiences, you would never know what fun treasure exploring brings to…

Treasure Exploration Time Limit: 6000MS   Memory Limit: 65536K Total Submissions: 8909   Accepted: 3644 Description Have you ever read any book about treasure exploration? Have you ever see any film about treasure exploration? Have you ever explored…

题意:       题意就是给你个有向无环图,问你最少放多少个机器人能把图全部遍历,机器人不能走回头路线. 思路:      如果直接建图,跑一遍二分匹配输出n - 最大匹配数会跪,原因是这个题目和以往见到的题目不一样的,区别就在,之前很多题目给的都是全边,就是假如 a->b b->c ,那么他一定会给你一条 a->c,因为a->c也是有指向关系的,而这个题目就没有给a->c,这就需要我们自己去找到所有可达边,一遍Floyd或者深搜都行,深搜是O(n^2)的,会快一点.给你在…

题目链接:https://vjudge.net/problem/POJ-2594 Treasure Exploration Time Limit: 6000MS   Memory Limit: 65536K Total Submissions: 9005   Accepted: 3680 Description Have you ever read any book about treasure exploration? Have you ever see any film about trea…

题目链接  http://poj.org/problem?id=2594) 题目大意: 一个有向图中, 有若干条连接的路线, 问最少放多少个机器人,可以将整个图上的点都走过. 最小路径覆盖问题. 分析: 这时最小路径覆盖问题, 最小路径覆盖 = |V| - 最大匹配数. (有关最小路径覆盖,最大匹配问题,相关概念不懂得 点这里) 当然做这道题还有一个坑!! 如果有向图的边有相交的情况,那么就不能简单的对原图求二分匹配了 详细讲解看这. #include<iostream> #include&l…

题目来源:http://poj.org/problem?id=2594 参考博客:http://www.cnblogs.com/ka200812/archive/2011/07/31/2122641.html 题解: 最小路径覆盖＝|P|-最大匹配数 单向图且没有循环,不可能存在a到b,b又到a,并且可以经过已经经过的点,所以对整个图进行处理,间接连接的点可以看作是直接连接 将整个图分成两边,点与点二分匹配,与平时的两种不同物体匹配不同 #include <iostream> #include…

Treasure Exploration Time Limit: 6000MS   Memory Limit: 65536K Total Submissions: 8550   Accepted: 3495 Description Have you ever read any book about treasure exploration? Have you ever see any film about treasure exploration? Have you ever explored…

Treasure Exploration Time Limit: 6000MS   Memory Limit: 65536K Total Submissions: 9794   Accepted: 3975 题目链接:http://poj.org/problem?id=2594 Description: Have you ever read any book about treasure exploration? Have you ever see any film about treasure…

                                             Treasure Exploration 复见此题,时隔久远,已忘,悲矣! 题意:用最少的机器人沿单向边走完(覆盖)全部的点.典型的最小路径覆盖,如果不懂二分图匹配可以参考:二分图大讲堂 先用floyd传递闭包,再求最大匹配,最小路径覆盖=V-最大二分匹配(最小点覆盖).为什么要用floyd传递闭包呢,每个点可以被多个机器人走过,博主就是这里没考虑到.. 我记得这个题是写过博客的....//领接矩阵匈牙利算…

Treasure Exploration Time Limit: 6000MS   Memory Limit: 65536K Total Submissions: 8130   Accepted: 3325 Description Have you ever read any book about treasure exploration? Have you ever see any film about treasure exploration? Have you ever explored…