UVA 11364 C++

#include<iostream>
using namespace std;
int main()
{
int n,times,min,max,input,len;
cin >> n;
for (int i = 0; i <= n - 1; i++)
{
cin >> times;
for (int j = 0; j <= times - 1; j++)
{
cin >> input;
if (j == 0)
{
min = input;
max = input;
}
else if (input > max)
max = input;
else if (input <= min)
min = input;
}
len = (max - min) * 2;
cout << len << endl;
}
return 0;
}