You are given an m x n matrix board, representing the current state of a crossword puzzle. The crossword contains lowercase English letters (from solved words), ' ' to represent any empty cells, and '#' to represent any blocked cells.
A word can be placed horizontally (left to right or right to left) or vertically (top to bottom or bottom to top) in the board if:
\n\n'#'.' ' (empty) or match the letter already on the board.' ' or other lowercase letters directly left or right of the word if the word was placed horizontally.' ' or other lowercase letters directly above or below the word if the word was placed vertically.Given a string word, return true if word can be placed in board, or false otherwise.
\n
Example 1:
\n![\"\"](\"https://assets.leetcode.com/uploads/2021/10/04/crossword-ex1-1.png\")
\n\nInput: board = [["#", " ", "#"], [" ", " ", "#"], ["#", "c", " "]], word = "abc"\nOutput: true\nExplanation: The word "abc" can be placed as shown above (top to bottom).\n\n\n
Example 2:
\n![\"\"](\"https://assets.leetcode.com/uploads/2021/10/04/crossword-ex2-1.png\")
\n\nInput: board = [[" ", "#", "a"], [" ", "#", "c"], [" ", "#", "a"]], word = "ac"\nOutput: false\nExplanation: It is impossible to place the word because there will always be a space/letter above or below it.\n\n
Example 3:
\n![\"\"](\"https://assets.leetcode.com/uploads/2021/10/04/crossword-ex3-1.png\")
\n\nInput: board = [["#", " ", "#"], [" ", " ", "#"], ["#", " ", "c"]], word = "ca"\nOutput: true\nExplanation: The word "ca" can be placed as shown above (right to left). \n\n\n
\n
Constraints:
\n\nm == board.lengthn == board[i].length1 <= m * n <= 2 * 105board[i][j] will be ' ', '#', or a lowercase English letter.1 <= word.length <= max(m, n)word will contain only lowercase English letters.Compiled with clang 11 using the latest C++ 20 standard.
Your code is compiled with level two optimization (-O2). AddressSanitizer is also enabled to help detect out-of-bounds and use-after-free bugs.
Most standard library headers are already included automatically for your convenience.
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