Codeforces Round #524 (Div. 2) C. Masha and two friends
题目连接：http://codeforces.com/contest/1080ios 题意：给你一个 n*m 的矩形区域，每一个格子的颜色为黑或者白。首先用白色染料去染某个区域（x1，y1，x2，y2）（某个矩形区域左下角右上角的坐标），再用黑色的染料去染某个区域（x3，y3，x4，y4），黑色的染料能够覆盖白色的染料染过的区域。求最后黑色和白色格子分别为多少个。c++ 思路：先算白色的格子，黑色
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