这道题是长沙邀请赛的题,当时是道签到题. 这种题还是很常见的,讲一下思路. 首先是预处理出每个宝藏之间的距离,还有到边的距离,直接对每个宝藏进行一次SPFA就可以了. 然后就是经典的求TSP的过程. #include <set> #include <map> #include <stack> #include <cmath> #include <queue> #include <cstdio> #include <string&…

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=4568 思路:先用spfa预处理出宝藏与宝藏之间的最短距离,宝藏到边界的最短距离,然后就是经典的求TSP过程了. #include<iostream> #include<cstdio> #include<cstring> #include<algorithm> #include<queue> using namespace std; #define M…

Hunter Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 2014    Accepted Submission(s): 615 Problem Description One day, a hunter named James went to a mysterious area to find the treasures. Jame…

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=4568 思路:首先spfa预处理出每对宝藏之间的最短距离以及宝藏到边界的最短距离,然后dp[state][u]表示当前在点u,状态为state的最短距离,然后更新就行. #include <iostream> #include <cstdio> #include <cstring> #include <algorithm> #include <queue&g…

题目链接: http://acm.hdu.edu.cn/showproblem.php?pid=4568 Hunter Time Limit: 2000/1000 MS (Java/Others)Memory Limit: 32768/32768 K (Java/Others) 问题描述 One day, a hunter named James went to a mysterious area to find the treasures. James wanted to research t…

想AC的人请跳过这一段... 题目应该都能读懂.但是个人觉得这题出的很烂,意思太模糊了. 首先,进出次数只能是一次!!这个居然在题目中没有明确说明,让我在当时看到题目的时候无从下手. 因为我想到了这几个数据: 1 1 1                  1 9 1                  -1 -1 -1 -1-1-1                     9 9 9                  -1 1 -1 1 1 1                       1 9…

题意:给一个n*m的格子,格子中有一些数,如果是正整数则为到此格子的花费,如果为-1表示此格子不可到,现在给k个宝藏的地点(k<=13),求一个人从边界外一点进入整个棋盘,然后拿走所有能拿走的宝藏的最小花费,如果一次不能拿走所有能拿到的或者根本拿不到任何宝藏,输出0. 解法:看到k的范围应该想到状态压缩,将每个格子都看成一个点,再新建两个点,一个表示边界外的起点,用0表示,一个表示边界外的终点,用n*m+1表示,然后相互建边,建有向边,边权为终点格子的花费值,(其实都不用建边,直接跑最短路也行)…

Unidirectional TSP Problem Description Problems that require minimum paths through some domain appear in many different areas of computer science. For example, one of the constraints in VLSI routing problems is minimizing wire length. The Traveling S…

XYZZY Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 5304    Accepted Submission(s): 1510 Problem Description It has recently been discovered how to run open-source software on the Y-Crate gam…

Key Vertex Time Limit: 10000/5000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others) Total Submission(s): 1347    Accepted Submission(s): 305 Problem Description You need walking from vertex S to vertex T in a graph. If you remove one vert…