#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    int tt;
    cin >> tt;
    while(tt--){
        int n;
        cin >> n;
        vector<int> a(n);
        int sum = 0;
        for(int i = 0; i < n; ++i){
            cin >> a[i];
            sum += a[i];
        }
        int ans = 0;
        int maxi = 0;
        for(int i = 0; i < n; ++i){
            if(a[i] + ans > 0){
                ans += a[i];
                maxi = max(maxi, ans);
            }
        }
        if(maxi >= sum){
            cout << "NO" << endl;
        }
        else{
            cout << "YES" << endl;
        }

    }
}