#include <cmath>
#include <cstdio> 
#include <cstdlib> 
#include <cstdio> 
#include <cstdlib> 
#include <cstring>
#include <iostream>
#include <map>
#include <algorithm>

int main()
{
    int t;
    scanf("%d", &t);
    while (t--)
    {
        int n;
        scanf("%d", &n);
        int ans = 0;
        for (int i = 0; i < n; i++)
        {
            int a;
            scanf("%d", &a);
            ans = std::max(ans, a);
        }
        printf("%d\n", ans);
    }
}