求助啊

#include<bits/stdc++.h>

using namespace std;
typedef long long ll ;
typedef int ii ;
typedef char cc ;
typedef double dd ;
typedef bool bb ;
int main() {
	int n;
	cin >> n;
	double sum = 0;
	double aum = 0;
	double pum = 0;
	double pig;
	for(int i = 0;i < n;i++){
		cin >> pig;
		sum += pig;
	}
	for(int i = 0;i < n;i++){
		cin >> pig;
		aum += pig;
	}
	cout <<fixed<< setprecision(6) << (sum * 3 - aum * 2) / (sum - aum);

	return 0;
}