#include <iostream>
#include <algorithm>
#include <vector>
#include <deque>
#include <queue>
#include <set>
#include <map>
#include <limits>
#include <cmath>
#include <iomanip>
#include <functional>
#include <random>
#include <unordered_map>
using namespace std;
using ll = long long;

int solve(){
    ll N;
    cin >> N;
    ll ans = 0;
    for(int i = 0;i < N;i++){
        ll a;
        cin >> a;
        ans += a;
    }
    cout << 0 << endl;
    return 0;
}
int main()
{
    ll T,S,D;
    cin >> T;
    while(T--){
        solve();
    }
    cout << endl;
    return 0;
}