想不出...

#include<bits/stdc++.h>
using namespace std;

int main(){
	int n,maxn,minn;
	cin>>n;
	for(int i=1;i<=n;++i){
		int a;
		cin>>a;
		if(a<maxn){
			maxn=maxn;
		}
		else
			maxn=a;
		if(a>minn){
			minn=minn;
		}
		else
			minn=a;
	}
	cout<<maxn-minn;
	return 0;
}