3-764-1.cpp

#include<bits/stdc++.h>
using namespace std;
void solve()
{
   int n;
   cin>>n;
   vector<int>a(n);
   for(int i=0;i<n;i++)
   {
    cin>>a[i];
   }
   sort(a.begin(),a.end());
   cout<<a[n-1]-a[0]<<endl;


















    return;
}

		
int main()
{
    int t;
    cin>>t;
    while(t--)
    {
        solve();
    }
    return 0;
}