题目链接:hdu 4771 Stealing Harry Potter's Precious 题目大意:在一个N*M的银行里,贼的位置在'@',如今给出n个宝物的位置.如今贼要将全部的宝物拿到手.问最短的路径,不须要考虑离开. 解题思路:由于宝物最多才4个,加上贼的位置,枚举两两位置,用bfs求两点距离,假设存在两点间不能到达,那么肯定是不能取全然部的宝物. 然后枚举取宝物的顺序.维护ans最小. #include <cstdio> #include <cstring> #incl…

http://acm.hdu.edu.cn/showproblem.php?pid=4771 给一个地图,@是起点,给一些物品坐标,问取完所有物品的最小步数,不能取完输出-1 物品数最多只有四个,状态压缩一下bfs即可 #include <iostream> #include <cstdio> #include <algorithm> #include <queue> #include <cstring> using namespace std;…

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=4771 题目意思:'@'  表示的是起点,'#' 表示的是障碍物不能通过,'.'  表示的是路能通过的: 目的:让你从 '@' 点出发,然后每个点只能走一次,求出最小的距离: 解题思路:先用 bfs 求解出任意两点之间的距离,用 ans[i][j],表示点 i 到点  j 的距离: 然后用 dfs 递归求出从起点经过所有点的距离中,比较出最小的: AC代码: #include<iostream> #…

Stealing Harry Potter's Precious Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Problem Description Harry Potter has some precious. For example, his invisible robe, his wand and his owl. When Hogwarts school is in…

2013杭州区域赛现场赛二水... 类似“胜利大逃亡”的搜索问题,有若干个宝藏分布在不同位置,问从起点遍历过所有k个宝藏的最短时间. 思路就是,从起点出发,搜索到最近的一个宝藏,然后以这个位置为起点,搜索下一个最近的宝藏,直至找到全部k个宝藏.有点贪心的感觉. 由于求最短时间,BFS更快捷,但耗内存,这道题就卡在这里了... 这里记录了我几次剪枝的历史...题目要求内存上限32768KB,就差最后600KB了...但我从理论上觉得已经不能再剪了,留下的结点都是盲目式搜索必然要访问的结点. 在此贴…

题目:给出一个二维图,以及一个起点,m个中间点,求出从起点出发,到达每一个中间的最小步数. 思路:由于图的大小最大是100*100,所以要使用bfs求出当中每两个点之间的最小距离.然后依据这些步数,建立一个新的图,使用dfs求出最佳步数. 代码: #include <iostream> #include <cstdio> #include <cstring> #include <queue> #define INF 100000000 using names…

Stealing Harry Potter's Precious Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 126    Accepted Submission(s): 63 Problem Description Harry Potter has some precious. For example, his invisible…

Description Harry Potter has some precious. For example, his invisible robe, his wand and his owl. When Hogwarts school is in holiday, Harry Potter has to go back to uncle Vernon's home. But he can't bring his precious with him. As you know, uncle Ve…

Problem Description Harry Potter has some precious. For example, his invisible robe, his wand and his owl. When Hogwarts school is in holiday, Harry Potter has to go back to uncle Vernon's home. But he can't bring his precious with him. As you know,…

Stealing Harry Potter's Precious Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 1343    Accepted Submission(s): 642 Problem Description Harry Potter has some precious. For example, his invisib…