这样也行！！！

#include <iostream>
using namespace std;
int main(){
int n,i;
cin>>n;
int a;
int minn,maxn;
cin>>a;
minn=a;
maxn=a;
while(i <= n){
cin>>a;
if(a>maxn){
maxn=a;
}
if(a<minn){
minn=a;
}
i++;
}
cout<<maxn-minn;
return 0;
}