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#include <bits/stdc++.h>
#define FOR(i, a, b) for (int i = (a); i <= (b); ++i)
#define ROF(i, a, b) for (int i = (a); i >= (b); --i)
#define all(x) x.begin(),x.end()
#define CLR(i,a) memset(i,a,sizeof(i))
#define fi first
#define se second
#define pb push_back
#define SZ(a) ((int) a.size())
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef pair<ll,ll> pll;
typedef array<ll,3> arr;
typedef double DB;
typedef pair<DB,DB> pdd;
constexpr ll MAXN=static_cast<ll>(3e2)+10,INF=static_cast<ll>(5e18)+3;
ll N,M,T,A[MAXN][MAXN];
ll suffix1[MAXN];
inline void solve(){
cin>>N;
for(int i=1;i<=N;++i){
for(int j=1;j<=N;++j){
cin>>A[i][j];
}
}
FOR(i,1,N){
ll cnt=0;
ROF(j,N,0){
if(A[i][j]!=1){
suffix1[i]=cnt;
break;
}
++cnt;
}
}
sort(suffix1+1,suffix1+1+N);
ll ans=0;
FOR(i,1,N){
if(suffix1[i]>=ans){
++ans;
}
}
cout<<ans<<"\n";
}
int main()
{
ios::sync_with_stdio(false);
cin.tie(0);cout.tie(0);
cin>>T;
while(T--){
solve();
}
return 0;
}
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