43 lines
1.0 KiB
C++
43 lines
1.0 KiB
C++
#include<iostream>
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#include<cstdio>
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#include<cstring>
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using namespace std;
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const int N=2010;
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int n,indeg[N];
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char str[N][N];
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int main(){
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int t,cases=0;
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scanf("%d",&t);
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while(t--){
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scanf("%d",&n);
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int flag=0;
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memset(indeg,0,sizeof(indeg));
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int i,j;
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for(i=0;i<n;i++){
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scanf("%s",str[i]);
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for(j=0;j<n;j++)
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if(str[i][j]=='1')
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indeg[j]++;
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}
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for(i=0;i<n;i++){
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for(j=0;j<n;j++)
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if(indeg[j]==0)
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break;
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if(j==n){
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flag=1;
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break;
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}else{
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indeg[j]--;
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for(int k=0;k<n;k++)
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if(str[j][k]=='1')
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indeg[k]--;
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}
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}
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if(flag)
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printf("Case #%d: Yes\n",++cases);
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else
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printf("Case #%d: No\n",++cases);
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}
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return 0;
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}
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