#include 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 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; } }