Rectangle Area

 1 class Solution {
 2 public:
 3     int computeArea(int A, int B, int C, int D, int E, int F, int G, int H) {
 4         int area = (C - A) * (D - B) + (G - E) * (H - F);
 5         if (C <= E || A >= G || D <= E || B >= H) { // 不相交
 6             return area;
 7         }
 8         int left = max(A, E);
 9         int right = min(G, C);
10         int top = min(H, D);
11         int bottom = max(F, B);
12         
13         return area - (right - left) * (top - bottom);
14     }
15 };