#include <cstdio>
#include <iostream>
#include <cstring>
#include <string>
#include <cstdlib>
#include <algorithm>
#include <cmath>
#include <vector>
#include <set>
#include <list>
#include <queue>
#include <map>
#include <stack>
using namespace std;
#define L(i) i<<1
#define R(i) i<<1|1
#define INF  0x3f3f3f3f
#define pi acos(-1.0)
#define eps 1e-3
#define maxn 2000010
#define MOD 100000007

int main()
{
    int n,t,c = 1;
    scanf("%d",&t);
    while(t--)
    {
        scanf("%d",&n);
        int Max = 0,x;
        for(int i  =0; i < n; i++)
        {
            scanf("%d",&x);
            Max = max(Max,x);
        }
        printf("%d\n",Max);
    }
    return 0;
}