Minesweeper Game II

Minesweeper is a classic single-player game. Players need to figure out whether a hidden cell is a mine, based on the known information, and mark the position of mines on a grid.

In this game challenge, you need to finish the function expandClick(board, i, j). This function should implement the algorithm for revealing the map when a user clicks a cell:

When you click a cell board[i][j], this cell will show the number of mines in its 8 neighbors. If the cell itself is a mine, just return. If there are no mines around (the number is 0), the function should automatically reveal its neighboring cells, and continue this process until it reaches cells with numbers.

Explanation