#include<bits/stdc++.h>
using namespace std;
int main(){
int n,maxn=-1,minn=1145141;
cin>>n;
for(int i=1;i<=n;++i){
int tmp;
cin>>tmp;
maxn=max(tmp,maxn);
minn=min(tmp,minn);
}
cout<<maxn-minn;//求差
return 0;
}
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