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Time Limit: 1000MS | Memory Limit: 65536K | |
Total Submissions: 16854 | Accepted: 4567 |
Description
Input
Output
Sample Input
3 3 0 1 0 0 0 1 1 0 0 4 4 0 0 0 1 1 0 0 0 1 1 0 1 0 1 0 0
Sample Output
Yes, I found it It is impossible
#include<iostream> #include<cstdio> #include<cstring> #include<string> #include<cmath> #include<algorithm> #include<cstdlib> #include<queue> #include<vector> #include<stack> using namespace std; int n,m,mp[305][305],vis[305]; bool check() { for(int i=0;i<m;i++) if(vis[i]!=1) return false; return true; } bool ok() { for(int i=0;i<m;i++) { if(vis[i]>1) return false; } return true; } bool dfs(int x) { if(check()) return true; for(int i=x;i<n;i++) { for(int j=0;j<m;j++) { vis[j]+=mp[i][j]; } if(ok()) { if(dfs(i+1)) return true; } for(int j=0;j<m;j++) { vis[j]-=mp[i][j]; } } return false; } int main() { while(scanf("%d%d",&n,&m)!=EOF) { memset(vis,0,sizeof(vis)); for(int i=0;i<n;i++) { for(int j=0;j<m;j++) scanf("%d",&mp[i][j]); } if(dfs(0)) { printf("Yes, I found it\n"); } else printf("It is impossible\n"); } return 0; }
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原文地址:http://www.cnblogs.com/a972290869/p/4430041.html