Let's play the minesweeper game (Wikipedia, online game)!
\n\nYou are given an m x n char matrix board representing the game board where:
'M' represents an unrevealed mine,'E' represents an unrevealed empty square,'B' represents a revealed blank square that has no adjacent mines (i.e., above, below, left, right, and all 4 diagonals),'1' to '8') represents how many mines are adjacent to this revealed square, and'X' represents a revealed mine.You are also given an integer array click where click = [clickr, clickc] represents the next click position among all the unrevealed squares ('M' or 'E').
Return the board after revealing this position according to the following rules:
\n\n'M' is revealed, then the game is over. You should change it to 'X'.'E' with no adjacent mines is revealed, then change it to a revealed blank 'B' and all of its adjacent unrevealed squares should be revealed recursively.'E' with at least one adjacent mine is revealed, then change it to a digit ('1' to '8') representing the number of adjacent mines.\n
Example 1:
\n![](\"https://assets.leetcode.com/uploads/2023/08/09/untitled.jpeg\")
\n\nInput: board = [["E","E","E","E","E"],["E","E","M","E","E"],["E","E","E","E","E"],["E","E","E","E","E"]], click = [3,0]\nOutput: [["B","1","E","1","B"],["B","1","M","1","B"],["B","1","1","1","B"],["B","B","B","B","B"]]\n\n\n
Example 2:
\n![](\"https://assets.leetcode.com/uploads/2023/08/09/untitled-2.jpeg\")
\n\nInput: board = [["B","1","E","1","B"],["B","1","M","1","B"],["B","1","1","1","B"],["B","B","B","B","B"]], click = [1,2]\nOutput: [["B","1","E","1","B"],["B","1","X","1","B"],["B","1","1","1","B"],["B","B","B","B","B"]]\n\n\n
\n
Constraints:
\n\nm == board.lengthn == board[i].length1 <= m, n <= 50board[i][j] is either 'M', 'E', 'B', or a digit from '1' to '8'.click.length == 20 <= clickr < m0 <= clickc < nboard[clickr][clickc] is either 'M' or 'E'.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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