hdu 1016 Prime Ring Problem
来源:互联网 发布:python nltk 中文 编辑:程序博客网 时间:2024/06/06 05:46
题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=1016
#include<cstdio>#include<cstring>#include<iostream>#include<algorithm>using namespace std;int dp[30],vis[100],N;int check(int x){ for(int i=2;i<x;i++) if(x%i==0) return 0; return 1;}void dfs(int n,int num){ int i; dp[n]=num;vis[num]=1;//n是记录存入的第几个数,num代表的是我下一个要搜的起始点&&把它标记 if(n==N)//判断是否输出 { if(check(dp[n]+dp[1])) { printf("1"); for(i=2;i<=N;i++) printf(" %d",dp[i]); printf("\n"); } return; } for(i=1;i<=N;i++) { if(!vis[i]&&check(dp[n]+i)) { dfs(n+1,i); vis[i]=0; } } return;}int main(){ int ccase=1; while(scanf("%d",&N)!=EOF) { printf("Case %d:\n",ccase++); memset(vis,0,sizeof(vis)); dfs(1,1); printf("\n"); } return 0;}
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