|시간 제한||메모리 제한||제출||정답||맞은 사람||정답 비율|
|1 초||512 MB||25||15||15||60.000%|
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 ≤ n ≤ 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