Implement Minesweeper click-to-reveal expansion

Minesweeper Click Logic

Implement the core 'click' functionality for a Minesweeper game. You are given a grid represented by a 2D list of characters where 'M' represents an unrevealed mine, 'E' represents an unrevealed empty square, and 'B' represents a revealed blank square.

You are also given a list click representing the row and column of the user's move.

Rules:

1. If a mine ('M') is clicked, change it to 'X' and the game is over.
2. If an unrevealed empty square ('E') is clicked:
   • If the square has one or more adjacent mines (including diagonals), reveal the number of adjacent mines and update the square to that digit (as a string).
   • If the square has zero adjacent mines, change it to 'B' and recursively reveal all adjacent unrevealed empty squares ('E').
3. If a revealed square is clicked, do nothing.

Function Signature

def updateBoard(board: list[list[str]], click: list[int]) -> list[list[str]]:

Examples

Example 1: Input: board = [['E', 'E'], ['E', 'M']], click = [0, 0] Output: [['1', '1'], ['1', 'M']] Explanation: Clicking (0,0) reveals a square adjacent to one mine at (1,1).

Example 2: Input: board = [['B', '1', 'E', '1', 'B'], ['B', '1', 'M', '1', 'B']], click = [1, 2] Output: [['B', '1', 'E', '1', 'B'], ['B', '1', 'X', '1', 'B']] Explanation: Clicking a mine turns it into 'X'.

Constraints

• m x n grid, 1 <= m, n <= 50.
• click is a valid coordinate.
• The board only contains 'M', 'E', 'B', or digits '1'-'8'.