Description 输入正整数n,把整数1,2,-,n组成一个环,使得相邻两个整数之和均为素数.输出时,从整数1开始逆时针排列.同一个环恰好输出一次.n<=16. A ring is composed of n (even number) circles as shown in diagram. Put natural numbers1,2--n into each circle separately, and the sum of numbers in two adjacent circl…

Prime Ring Problem 思路:先看成一条链,往里头填数,满足任意相邻两数和为质数(这可以打表预处理出40以内的所有质数,扩展的时候枚举),填完了后检查首尾是否满足条件.字典序可以采用扩展时从小到大枚举.另外注意对于每个case多输出一个换行,行末不要有空格. #include<bits/stdc++.h> using namespace std; int n,cnt,a[25]; bool p[45],vis[25]; void print() { for(int i=1;i&l…

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=1016 题目大意:输入一个n,环从一开始到n,相邻两个数相加为素数. #include <iostream> #include <cstdio> #include <cstring> using namespace std; ],q[],n; int sushu(int n) { int i; ; i*i<=n; i++) ) ; ; } void dfs(int x,…

题目OJ地址: https://www.luogu.org/problemnew/show/UVA524 hdu oj 1016:  https://vjudge.net/problem/HDU-1016 zoj 1457  :https://vjudge.net/problem/ZOJ-1457 题意翻译 输入正整数n,把整数1,2,...,n组成一个环,使得相邻两个整数之和均为素数.输出时,从整数1开始逆时针排列.同一个环恰好输出一次.. 多组数据,读入到EOF结束. 第i组数据输出前加上一…

Prime Ring Problem A ring is compose of n circles as shown in diagram. Put natural number 1, 2, ..., n into each circle separately, and the sum of numbers in two adjacent circles should be a prime. Note: the number of first circle should always be 1.…

  Prime Ring Problem  A ring is composed of n (even number) circles as shown in diagram. Put natural numbers into each circle separately, and the sum of numbers in two adjacent circles should be a prime. Note: the number of first circle should always…

Prime Ring Problem Time Limit: 4000/2000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 18313    Accepted Submission(s): 8197 Problem Description A ring is compose of n circles as shown in diagram. Put natural numbe…

Prime Ring Problem Time Limit : 4000/2000ms (Java/Other)   Memory Limit : 65536/32768K (Java/Other) Total Submission(s) : 18   Accepted Submission(s) : 7 Problem Description A ring is compose of n circles as shown in diagram. Put natural number 1, 2,…

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=1016 Prime Ring Problem Time Limit: 4000/2000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others) Problem Description A ring is compose of n circles as shown in diagram. Put natural number 1, 2…

Problem Description A ring is compose of n circles as shown in diagram. Put natural number 1, 2, ..., n into each circle separately, and the sum of numbers in two adjacent circles should be a prime. Note: the number of first circle should always be 1…