就这样

#include<bits/stdc++.h>
using namespace std;
int main(){
int n;
int bans = -1e9;
int sans = 1e9;
const int N = 1e5+5;
int a[N];
cin>>n;
for(int i = 1;i<=n;i++){
cin>>a[i];
}
for(int i = 1;i<=n;i++){
bans = max(a[i],bans);
sans = min(a[i],sans);
}
cout<<bans - sans;
}