#include <stdio.h>

using namespace std;

void citire()
{
    freopen("xerox.in","r",stdin);
    freopen("xerox.out","w",stdout);
    int t,n,x,s;
    scanf("%d", &t);
    for (int i=1; i<=t; i++)
    {
        scanf("%d\n", &n);
        s=0;
        for (int j=1; j<=n; j++)
        {
            scanf("%d\n", &x);
            s^=x;
        }
        if (s==0)
            printf("0\n");
        else
            printf("1\n");
    }
    fclose(stdin);
    fclose(stdout);
}

int main()
{
    citire();
    return 0;
}