//FAVMIN
#include <bits/stdc++.h>
#define maX(a,b) ( (a) > (b) ? (a) : (b))
using namespace std;
int main()
{
int t,i,res,n,temp;
cin >> t;
while (t--)
{
cin >> n;
res = INT_MIN;
for(i=0; i<n; i++)
{
cin >> temp;
res = maX(res,temp);
}
cout << res << endl;
}
return 0;
}
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