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…

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 : 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…

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…

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…

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…

题目传送门  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 ever…

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…

描述 孤单的zydsg又一次孤单的度过了520,不过下一次不会再这样了.zydsg要做些改变,他想去和素数小姐姐约会. 所有的路口都被标号为了一个4位素数,zydsg现在的位置和素数小姐姐的家也是这样,如果两个路口间只差1个数字,则有一条路连通两个路口.(例如1033和1073间有一条路连接) 现在,你知道了zydsg的位置和素数小姐姐的家,问最少zydsg要走多少条路才能见到素数小姐姐.例如:如果zydsg在1033,素数小姐姐的家在8179,最少要走6条街,走法为: 1033 1733 37…