题目链接:https://vjudge.net/problem/POJ-3126 题意:给你两个四位的素数N,M,每次改变N四位数中的其中一位,如果能经过有限次数的替换变成四位数M,那么求出最少替换次数,否则输出“Impossible”.(N,M必须一直是素数) 思路:bfs.四位数,每一位可以替换为0~9,那么我们可以每次改变N中的一位数,然后放入队列中,当然,在替换数字时难免会出现重复的四位数,这样会造成TLE,那么我们可以创建一个bool数组标记出现过的,我们也需要素数筛999 ~ 100…

Prime Path Time Limit: 1000MS Memory Limit: 65536K Total Submissions: 14091 Accepted: 7959 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-digit r…

Prime Path Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 20237   Accepted: 11282 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-di…

A - Prime Path(11.1.1) Time Limit:1000MS    Memory Limit:65536KB    64bit IO Format:%I64d & %I64u SubmitStatus Description The ministers of the cabinet were quite upset by the message from the Chief of Security stating that they would all have to cha…

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=1973 Prime Path Time Limit: 5000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others) Problem Description The ministers of the cabinet were quite upset by the message from the Chief of Secu…

Language: Default Prime Path Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 11703   Accepted: 6640 Description The ministers of the cabinet were quite upset by the message from the Chief of Security stating that they would all have to c…

Prime Path Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 27132   Accepted: 14861 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-di…

Prime Path Time Limit: 1000MS Memory Limit: 65536K Total Submissions: 26475 Accepted: 14555 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-digit…

Prime Path Time Limit: 5000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 987    Accepted Submission(s): 635 Problem Description The ministers of the cabinet were quite upset by the message from the Chief of S…

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…

题目链接:Prime Path 题目大意 从一个四位素数m开始,每次只允许变动一位数字使其变成另一个四位素数.求最终把m变成n所需的最少次数. 思路 BFS.搜索的时候,最低位为0,2,4,6,8可以先排除(偶数不会是素数),最高位是0的也可以排除.这个题判断素数的次数比较少,可以不打素数表. 题解 第二次写的时候代码写的很乱..没有第一遍干净了 #include <iostream> #include <cstring> #include <queue> using…

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 原文是English 这里直接上中文了 Descriptions: 给你两个四位的素数a,b.a可以改变某一位上的数字变成c,但只有当c也是四位的素数时才能进行这种改变.请你计算a最少经过多少次上述变换才能变成b.例如:1033 -> 8179 1033 1733 3733 3739 3779 8779 8179最少变换了6次.Input 第一行输入整数T,表示样例数. (T <= 100) 每个样例输入两个四位的素数a,b.(没有前导零) Output 对于每个样例,输…

Prime Path Time Limit: 1000MS   Memory Limit: 65536KB   64bit IO Format: %I64d & %I64u Submit Status 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 fo…

  POJ 3126  Prime Path Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 16204   Accepted: 9153 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…

题目连接 http://acm.hdu.edu.cn/showproblem.php?pid=1973 Prime Path 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-digit room numbers on their offices…

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…

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-digit room numbers on their offices.  — It is a matter of security to change such things every now…

Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 9519   Accepted: 5458 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-digit room numb…

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…

Prime Path Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 15325   Accepted: 8634 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-dig…

意甲冠军  给你两个4位质数a, b  每次你可以改变a个位数,但仍然需要素数的变化  乞讨a有多少次的能力,至少修改成b 基础的bfs  注意数的处理即可了  出队一个数  然后入队全部能够由这个素数经过一次改变而来的素数  知道得到b #include <cstdio> #include <cstring> using namespace std; const int N = 10000; int p[N], v[N], d[N], q[N], a, b; void initP…

Prime Path Time Limit : 2000/1000ms (Java/Other)   Memory Limit : 131072/65536K (Java/Other) Total Submission(s) : 21   Accepted Submission(s) : 18 Problem Description The ministers of the cabinet were quite upset by the message from the Chief of Sec…

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-digit room numbers on their offices. — It is a matter of security to change such things every now…

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,…

题目链接:http://poj.org/problem?id=3126 Prime Path Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 32036   Accepted: 17373 Description The ministers of the cabinet were quite upset by the message from the Chief of Security stating that they…

Prime Path   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-digit room numbers on their offices. — It is a matter of security to change such thin…

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…

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…

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…