#include <bits/stdc++.h>
using namespace std;
int main() {
  ios_base::sync_with_stdio(false), cin.tie(NULL), cout.tie(NULL);
  long long TC = 1;
  cin >> TC;
  while (TC--) {
    int n, f = 1, c = 0;
    cin >> n;
    int a[n], feq[110] = {0};
    for (int i = 0; i < n; i++) {
      cin >> a[i];
      feq[a[i]]++;
    }
    sort(a, a + n);
    for (int i = 0; i < n - 1; i++) {
      if (a[i + 1] - a[i] > 1) f = 0;
    }
    if (f)
      cout << "YES\n";
    else
      cout << "NO\n";
  }
  return 0;
}
