很简单

#include <iostream>
using namespace std;
int main()
{
    int n,a[20],max=-1,min=100;
    cin >> n;
    for(int i=0;i<n;i++)
    {
        cin >> a[i];
        if(a[i]>max)
        {
            max=a[i];
        }
        if(a[i]<min)
        {
            min=a[i];
        }
    }
    cout << (max-min)*2;
    return 0;
}