#include <bits/stdc++.h>
using namespace std;
int main() {
  long long t;
  cin >> t;
  while (t--) {
    long long n;
    cin >> n;
    long long a[n];
    for (long long i = 0; i < n; i++) cin >> a[i];
    sort(a, a + n);
    long long flg = 0;
    for (long long i = 0; i < n - 1; i++)
      if (a[i] == a[i + 1]) flg = 1;
    if (flg)
      cout << "YES" << endl;
    else
      cout << "NO" << endl;
  }
}
