答案

#include <iostream>
using namespace std;
int main(){
	int n;
	cin >> n;
	int a[n];
	double m = 0;
	for(int i = 0; i < n; i++){
		cin >> a[i];
		m += a[i];
	}
	m /= n;
	for(int i = 0; i < n; i++){
		if(a[i] < m){
			cout << a[i] << " ";
		}
	}
	return 0;
}