|시간 제한||메모리 제한||제출||정답||맞은 사람||정답 비율|
|1 초||1024 MB||5||4||4||80.000%|
You are given an $n$-by-$n$ grid where each square is colored either black or white. A grid is correct if all of the following conditions are satisfied:
Given a grid, determine whether it is correct.
The first line contains an integer $n$ ($2\le n\le 24$; $n$ is even). Each of the next $n$ lines contains a string of length $n$ consisting solely of the characters '
B' and '
W', representing the colors of the grid squares.
If the grid is correct, print the number $1$ on a single line. Otherwise, print the number $0$ on a single line.
4 WBBW WBWB BWWB BWBW
4 BWWB BWBB WBBW WBWW
6 BWBWWB WBWBWB WBBWBW BBWBWW BWWBBW WWBWBB
6 WWBBWB BBWWBW WBWBWB BWBWBW BWBBWW WBWWBB