矩形边平行X轴或Y轴
输入:矩形某对角线上两个点
输出:交面积
#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;
}