#include<map>
#include<queue>
#include<cmath>
#include<cstdio>
#include<stack>
#include<iostream>
#include<cstring>
#include<algorithm>
#define LL long long 
#define inf 0x3f3f3f3f
#define eps 1e-8
#include<vector>
#define ls l,mid,rt<<1
#define rs mid+1,r,rt<<1|1
using namespace std;
int arr[10010];

int main(){
    int n,m,i,j,cla,k;
    scanf("%d",&cla);
    while(cla--){
        scanf("%d",&n);
        int ma = 0;
        while(n--){
            scanf("%d",&k);
            ma = max(ma,k);
        }
        printf("%d\n",ma);
    }
    return 0;
}