Solution

#include <bits/stdc++.h>
using namespace std;

#define endl "\n"

int main() {
    ios_base :: sync_with_stdio(false);
    //freopen("input.txt", "r", stdin);
    //freopen("output.txt", "w", stdout)

    int t, n;
    cin >> t;

    while(t--) {
        cin >> n;
        int a[n], deg_sum = 0;
        bool deg_error = false;
        for(int i = 0; i < n; i++) {
            cin >> a[i];
            if(a[i] > n-1) deg_error = true;
            deg_sum += a[i];
        }

        if(deg_sum % 2 == 0 && !deg_error) cout << "YES" << endl;
        else cout << "NO" << endl;
    }
}