【蓝桥杯】（3.19矩形总面积）

#include <iostream>
#define LL long long
using namespace std;
int main()
{
    LL x1,y1,x2,y2,x3,y3,x4,y4;
    cin>>x1>>y1>>x2>>y2>>x3>>y3>>x4>>y4;
    LL s1,s2,s;
    s1=(x2-x1)*(y2-y1);
    s2=(x4-x3)*(y4-y3);

    LL a1=max(min(x1,x2),min(x3,x4));//左边大的
    LL a2=min(max(x1,x2),max(x3,x4));//右边小的
    LL a3=max(min(y1,y2),min(y3,y4));
    LL a4=min(max(y1,y2),max(y3,y4));

    s=s1+s2-(a2-a1)*(a4-a3);
    if(a1<a2&&a3<a4)
    cout<<s;
    else
    cout<<s1+s2;
  // 请在此输入您的代码
  return 0;
}