POJ3126 Prime Path 一开始想通过终点值双向查找,从最高位开始依次递减或递增,每次找到最接近终点值的素数,后来发现这样找,即使找到,也可能不是最短路径, 而且代码实现起来特别麻烦,后来搜了一下解题报告,才发现是bfs(). 想想也是,题目其实已经提示的很清楚了,求最短的路径,对于每一个数,每次可以把4位中的任意一位,  换成与该位不相同的0-9中的任意一位,对于迷宫类 bfs每次转移数为上下左右四个状态,而此题就相当于每次可以转移40个状态(其实最低位为偶数可以排除,不过题目数据…

题目链接:http://poj.org/problem?id=3126 Prime Path Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 22936   Accepted: 12706 Description The ministers of the cabinet were quite upset by the message from the Chief of Security stating that they…

题目:http://poj.org/problem?id=3126 题意:给定两个四位数,求从前一个数变到后一个数最少需要几步,改变的原则是每次只能改变某一位上的一个数,而且每次改变得到的必须是一个素数: #include <iostream> #include<cstdio> #include<cstring> #include<cstdlib> #include<stack> #include<queue> #include<…

题目链接. AC代码如下: #include <iostream> #include <cstdio> #include <cstring> #include <cstdlib> #include <string> #include <queue> #include <algorithm> #include <map> #include <ctype.h> using namespace std;…

链接 : Here! 思路 : 素数表 + BFS, 对于每个数字来说, 有四个替换位置, 每个替换位置有10种方案(对于最高位只有9种), 因此直接用 BFS 搜索目标状态即可. 搜索的空间也不大... /************************************************************************* > File Name: E.cpp > Author: > Mail: > Created Time: 2017年11月26日…

POJ 3126 Prime Path(素数路径) Time Limit: 1000MS    Memory Limit: 65536K Description - 题目描述 The ministers of the cabinet were quite upset by the message from the Chief of Security stating that they would all have to change the four-digit room numbers on…

题目: The ministers of the cabinet were quite upset by the message from the Chief of Security stating that they would all have to change the four-digit room numbers on their offices.— It is a matter of security to change such things every now and then,…

The ministers of the cabinet were quite upset by the message from the Chief of Security stating that they would all have to change the four-digit room numbers on their offices.- It is a matter of security to change such things every now and then, to…

Prime Path Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 9982   Accepted: 5724 Description The ministers of the cabinet were quite upset by the message from the Chief of Security stating that they would all have to change the four-digi…

Prime Path DescriptionThe ministers of the cabinet were quite upset by the message from the Chief of Security stating that they would all have to change the four-digit room numbers on their offices.— It is a matter of security to change such things e…