#include<bits/stdc++.h> using namespace std; int n,m,flag; int a[15][15]; int main(){ while(cin>>n>>m&&(n!=0||m!=0)){ flag=1; int f=0; memset(a,0,sizeof(a)); for(int i=1;i<=n;++i){ for(int j=1;j<=m;++j){ scanf("%d",&a[i][j]); if(a[i][j]==0) f=1; } } for(int i=1;i<=n;++i){ for(int j=1;j<=m;++j){ if(a[i][j]==1){ if(a[i-1][j]==0&&a[i+1][j]==0&&a[i][j-1]==0&&a[i][j+1]==0) ; else flag=0; } } } if(flag&&f)cout<<"Yes"<<endl; else cout<<"No"<<endl; } } |
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