倒数第二个点和倒数第三个点WA

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

long long maxn = -0x7fffffff;
long long minn = 0x7fffffff;

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