1360C.cpp

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

int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);

    int t;
    cin >> t;

    while (t--) {
        int n;
        cin >> n;
        vector<int> a(n);
        for (int &x : a) cin >> x;

        int odd = 0, even = 0;
        for (int x : a) {
            if (x % 2 == 0) even++;
            else odd++;
        }

        bool possible = false;

        if (odd % 2 == 0 && even % 2 == 0) {
            possible = true;
        } else {
            sort(a.begin(), a.end());
            for (int i = 1; i < n; ++i) {
                if (abs(a[i] - a[i - 1]) == 1) {
                    possible = true;
                    break;
                }
            }
        }

        cout << (possible ? "YES\n" : "NO\n");
    }

    return 0;
}