171103_숫자골라내기

#include <iostream>

using namespace std;

int Answer;

int main(int argc, char** argv)
{
    int T, test_case;
    int N;

    cin >> T;
    for(test_case = 0; test_case  < T; test_case++)
    {

        Answer = 0;
        int x;
        cin >> N;
        for(int i=0; i<N; i++) 
        {
            cin>>x;
            Answer ^= x;
        }
        cout << "Case #" << test_case+1 << endl;
        cout << Answer << endl;
    }

    return 0;//Your program should return 0 on normal termination.
}