M. Camouflage (搜索)
从外层开始搜，标记哪些在外围的点找到内层的点，记录要涂的点数，合适就填上。// Problem: M. Camouflage// Contest: Codeforces - The 15-th BIT Campus Programming Contest - Onsite Round// URL: https://codeforces.com/gym/102878/problem/M// Memory Limit: 256 MB// Time Limit: 1000 ms// // Powe
