为什么会UKE？

#include<cstdio>
#include<cstring>
#include<iostream>
using namespace std;
int t;
int main() {
	cin >> t;
	while (t--) {
		int a, cnt = 0;
		cin >> a;
		if (a == 1) cout << 1 << endl;
		if (a == 2) cout << -1 << endl;
		if (a > 2) {
			for (int i = 1; i <= a * a; i += 2) {
				cnt++;
				cout << i << " ";
				if (cnt % a == 0) cout << endl;
			}
			for (int i = 2; i <= a * a; i += 2) {
				cnt++;
				cout << i << " ";
				if (cnt % a == 0) cout << endl;
			}
		}
	}
	return 0;
}

结果