#include<bits/stdc++.h>
using namespace std;
int main()
{
int t;
cin >> t;
while(t--){
int n;
cin >> n;
int arr[n];
int i;
for(i = 0; i < n; i++){
cin >> arr[i];
}
int mx = arr[0];
for(i = 0; i < n; i++){
if(arr[i] >= mx){
mx = arr[i];
}
}
cout << mx << endl;
}
return 0;
}
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