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E.cpp
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E.cpp
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#include<bits/stdc++.h>
#include<string>
using namespace std;
#define fastio ios_base::sync_with_stdio(false);cin.tie(NULL)
int main()
{
fastio;
int t,n,i,j,p;
char ara[100][100];
cin>>t;
while(t--)
{
cin>>n;
p=0;
for(i=0;i<n;i++)
{
for(j=0;j<n;j++)
cin>>ara[i][j];
}
for(i=0;i<n;i++)
{
for(j=0;j<n;j++)
{
if(ara[i][j]=='1')
{
if(i==n-1 || j==n-1)
continue;
if(ara[i][j+1]!='1' && ara[i+1][j]!='1')
{
p=1;
break;
}
}
}
}
if(p==1)
cout<<"NO\n";
else
cout<<"YES\n";
}
return 0;
}