一:题目

二：上码

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

int main() {
	int n;
	cin >> n;
	vector<int> v(n,0);
	
	for (int i = 0; i < n; i++) {
	 	cin >> v[i];
	}
	
	sort(v.begin(),v.end());
	double sum = accumulate(v.begin(),v.end(),0);
	
	double ans = sum/n;
	
	cout << v[n-1] << endl;
	cout << v[0] << endl;
	printf("%.2f",ans);
}