题目大意: 素数路径 估计看数据就明白这道题什么意思了......给两个素数,都是四位数的素数,并且没有前导0,现在需要经过一种变换把一个素数转换成另一个,当然这种转换是有规则的,规则就是每次只能改变这个四位数的其中一位数字,当然改变后的数字也得是素数,问最少的改变次数是多少...... 貌似还是广搜..............................................................................................不过做起来…

#include<iostream> #include<cstdio> #include<cstring> #include<algorithm> #include<queue> using namespace std; struct node { int x; int s; }; ]; ]; int chr(int x,int i,int j) { ; ; ; z<= ; z++) { b = x%; x/=; if(i==z) b =…

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 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 a…

Prime Path POJ - 3126 题意: 给出两个四位素数 a , b.然后从a开始,每次可以改变四位中的一位数字,变成 c,c 可以接着变,直到变成b为止.要求 c 必须是素数.求变换次数的最小值.(a,b,c都是四位数字,输入时没有前导零) 分析: 每次改变可以获得一个四位数c,然后如果c是素数并且之前没有出现过,那么我们把它放入队列即可. int f[10001]; int v[10001]; void init()//素数筛 { memset(f,0,sizeof f); fo…

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…

  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…

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…

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…