装备

我的代码：

#include <bits/stdc++.h>
using namespace std;
#define ll long long
int n;
int a [10005];
ll maxai = -1,minai = 1000000000000000;
int main()
{
	cin >> n;
	for (int i = 1;i <= n;i ++)
	{
		cin >> a [i];
		if (a [i] >= maxai)
		    maxai = a [i];
		if (a [i] <= minai)
		    minai = a [i];
	}
	cout << maxai - minai;
    return 0;
}

样例都过了，可是0分。