#include <bits/stdc++.h>
using namespace std;
void solve() {
  int n;
  cin >> n;
  set<int> s;
  for (int i = 0; i < n; i++) {
    int val;
    cin >> val;
    s.insert(val);
  }
  cout << (s.size() == n ? "NO" : "YES") << endl;
}
int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  int t = 1;
  cin >> t;
  while (t--) {
    solve();
  }
  return 0;
}
