View Code of Problem 3929

#include<iostream>
#include<cstdio>
using namespace std;
int main() {
	int T;
	scanf("%d", &T);
	while (T--) {
		int n;
		scanf("%d", &n);
		int* num = new int[n];
		int sum = 0;
		for (int i = 0; i < n; i++)
		{
			scanf("%d", &num[i]);
			sum ^= num[i];
		}
		cout << sum << endl;
	}
	return 0;
}