Daily Coding Problem: Problem #1697 [Easy]

Good morning! Here's your coding interview problem for today.

This problem was asked by Palantir.

A typical American-style crossword puzzle grid is an N x N matrix with black and white squares, which obeys the following rules:

• Every white square must be part of an "across" word and a "down" word.
• No word can be fewer than three letters long.
• Every white square must be reachable from every other white square.
• The grid is rotationally symmetric (for example, the colors of the top left and bottom right squares must match).

Write a program to determine whether a given matrix qualifies as a crossword grid.

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