有两个点爆了long long，不知道为什么awa。

#include <cmath>
#include <iostream>
using namespace std;
int main() {
	long long answer = 0,minn;
	int n;
	cin >> n;
	for(int i = 1; i <= n; i ++ ) {
		long long a;
		cin >> a;
		answer = max(answer,a - minn);
		minn = min(a,minn);
	}
	cout << answer;
	return 0;
}

玄关