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 » Solve this problem
这道题看不懂,有谁能解释一下这道题的题意?
capture all regions surrounded by 'X'.
A region is captured by flipping all 'O's into 'X's in that surrounded region .
这两句话我都看不懂,有谁能解释一下吗?