#include <bits/stdc++.h>
using namespace std;
int main() {
  long long int test;
  cin >> test;
  while (test--) {
    long long int n;
    cin >> n;
    long long int a[n];
    for (int i = 0; i < n; i++) {
      cin >> a[i];
    }
    long long int total_sum = 0;
    for (int i = 0; i < n; i++) {
      total_sum += a[i];
    }
    if (total_sum < 0 && n == 1) {
      cout << "YES" << endl;
      continue;
    } else if (total_sum < 0) {
      cout << "NO" << endl;
      continue;
    }
    long long int sum = 0;
    long long int max_so_far = 0;
    long long int element = 0;
    long long int element_f = 0;
    for (int i = 0; i < n; i++) {
      sum = sum + a[i];
      element++;
      if (sum <= 0) {
        element = 0;
        sum = 0;
      } else if (sum > max_so_far) {
        element_f = element;
        max_so_far = sum;
      }
    }
    if (max_so_far >= total_sum && element_f < n)
      cout << "NO" << endl;
    else
      cout << "YES" << endl;
  }
  return 0;
}
