本文介绍了一种算法，该算法用于处理包含‘X’和‘O’的二维棋盘，通过将所有被‘X’包围的‘O’区域中的‘O’翻转为‘X’来实现捕获这些区域。
Given a 2D board containing ‘X’ and ‘O’, capture all regions surrounded by ‘X’.
A region is captured by flipping all ‘O’s into ‘X’s in that surrounded region .
For example,
X X X X
X O O X
X X O X
X O X X
After running your function, the board should be:
X X X X
X X X X
X X X X
X O X X
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