矩形的交面積

矩形邊平行X軸或Y軸

輸入：矩形某對角線上兩個點

輸出：交面積

#include<iostream>
#include<cmath>
using namespace std;
int main() {
	double x1,y1,x2,y2;
	double x3,y3,x4,y4;
	double m1,m2,n1,n2;
	cin>>x1>>y1>>x2>>y2>>x3>>y3>>x4>>y4;
	m1=min(max(x1,x2),max(x3,x4));
	n1=min(max(y1,y2),max(y3,y4));
	m2=max(min(x1,x2),min(x3,x4));
	n2=max(min(y1,y2),min(y3,y4));
	if(m1>m2&&n1>n2) {
		cout<<(m1-m2)*(n1-n2)<<endl;
	} 
	else
		cout<<"0.00"<<endl;
	return 0;
}