가죽 패턴 변경하기 (심화)
| Time limit | Memory limit |
|---|---|
| 1 sec | 128 MB |
📃 Problem
💻 Input
🖨️ Output
💻 Sample Input 1
6 16 ................ ..XXXX....XXX... ...XXXX....XX... .XXXX......XXX.. ........XXXXX... ..XXX....XXX....
🖨️ Sample Output 1
4
Source: USACO 2011 November Contest, Silver Division Problem 1. Cow Beauty Pageant (Silver Level)