#include <bits/stdc++.h>
using namespace std;
using ll = long long int;
int main(){
    ll T;
    cin >> T;
    for(ll t = 0;t < T;t++){
        ll N,f = 0;
        cin >> N;
        vector<ll> A(N);
        for(ll i = 0;i < N;i++){
            cin >> A[i];
            assert(A[i] == 0 || A[i] == 1);
            f += A[i];
        }
        cout << 0 << endl;
    }
}