leetcode-223-rectangle area

Find the total area covered by two rectilinear rectangles in a 2D plane.

求出两个矩形覆盖的面积值。

分重叠与无重叠两种情况讨论，很简单。

class Solution {
public:
    int computeArea(int A, int B, int C, int D, int E, int F, int G, int H) {
        int AreaA = (C-A)*(D-B);
        int AreaB = (G-E)*(H-F);
        if(A>=G||C<=E||B>=H||F>=D) return AreaA+AreaB;
        int cover = max(min(C,G)-max(A,E),0)*max(min(D,H)-max(F,B),0);
        return AreaA+AreaB-cover;
    }
};