没开数组，优化了内存，时间复杂度O(n) 

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

int n;

int main()
{
	int a = INT_MAX, b = -1;
	
	scanf("%d", &n);
	
	while(n --)
	{
		int x; cin >> x;
		a = min(a, x);
		b = max(b, x);
	}
	
	printf("%d %d %d", a, b, __gcd(a, b));
    return 0;
}