#include <map>
#include <set>
#include <list>
#include <cmath>
#include <queue>
#include <stack>
#include <bitset>
#include <vector>
#include <cstdio>
#include <string>
#include <cassert>
#include <climits>
#include <sstream>
#include <cstdlib>
#include <cstring>
#include <iostream>
#include <algorithm>
using namespace std;

const int INF=0x3f3f3f3f;
typedef long long ll;
typedef unsigned long long ull;
#define fi first
#define se second
#define prN printf("\n")
#define SI(N) scanf("%d",&(N))
#define SII(N,M) scanf("%d%d",&(N),&(M))
#define SIII(N,M,K) scanf("%d%d%d",&(N),&(M),&(K))
#define cle(a,val) memset(a,(val),sizeof(a))
#define rep(i,b) for(int i=0;i<(b);i++)
#define Rep(i,a,b) for(int i=(a);i<(b);i++)

const double PI=3.1415926;
int k=0;
int main()
{

    int o;
    cin>>o;
    while(o--)
    {
        int n;
        cin>>n;
        int a;
        int ans=0;
        for (int i=0;i<n;i++)
        {
            cin>>a;
            ans=max(ans,a);
        }
        printf("%d\n",ans);
    }



    return 0;
}