Easy_42_223_Rectangle Area.cpp

class Solution {
public:
    int computeArea(int A, int B, int C, int D, int E, int F, int G, int H) {
        int area = (C-A)*(D-B) + (G-E)*(H-F);
        if (A >= G || B >= H || C <= E || D <= F)
           return area;
        int top = min(D, H);
        int bottom = max(B, F);
        int left = max(A, E);
        int right = min(C, G);
        return area - (top-bottom)*(right-left);
    }
};