题号：NC218995
时间限制：C/C++/Rust/Pascal 1秒，其他语言2秒
空间限制：C/C++/Rust/Pascal 256 M，其他语言512 M
64bit IO Format: %lld
时间限制：C/C++/Rust/Pascal 1秒，其他语言2秒
空间限制：C/C++/Rust/Pascal 256 M，其他语言512 M
64bit IO Format: %lld
题目描述
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:
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Every row has the same number of black squares as it has white squares.
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Every column has the same number of black squares as it has white squares.
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No row or column has 3 or more consecutive squares of the same color.
Given a grid, determine whether it is correct.
输入描述:
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.
输出描述:
If the grid iscorrect, print the number 1 on a single line. Otherwise, print the number 0 on a single line.