leetcode 223 Rectangle Area

https://leetcode.com/problems/rectangle-area/discuss/705462/C-36-ms-100-O(1)-15.4-mb-100-O(1)

class Solution {
public:
    int computeArea(int A, int B, int C, int D, int E, int F, int G, int H) {
        long area1=(C-A)*(D-B),area2=(G-E)*(H-F);
        if(C<=E||A>=G||B>=H||F>=D) {cout<<"1";return area1+area2;}
        int w=min(C,G)-max(A,E),h=min(D,H)-max(B,F);
        return area1+area2-w*h;
    }
};