#include <iostream>

using namespace std;

int main()
{
    long tests;
    cin >> tests;
    long count = 0;

    long* sol = new long[tests];

    while (count < tests) {
        // load array
        long n;

        cin >> n;
        long* a = new long[n];
        for (long i = 0; i < n; i++) {
            cin >> a[i];
        }
        count++;
    }
    for (long i = 0; i < tests; i++) {
        cout << 0 << endl;
    }
    return 0;
}