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Surrounded_Region.py
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Surrounded_Region.py
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class Solution:
def capture(self, board, i, j):
board[i][j] = 'S'
if i > 0 and board[i - 1][j] == 'O':
self.capture(board, i-1, j)
if j > 0 and board[i][j - 1] == 'O':
self.capture(board, i, j - 1)
if i < len(board) - 1 and board[i + 1][j] == 'O':
self.capture(board, i + 1, j)
if j < len(board[0]) - 1 and board[i][j + 1] == 'O':
self.capture(board, i, j + 1)
def solve(self, board):
if len(board) == 0:
return []
for i in range(0, len(board)):
if board[i][0] == 'O':
self.capture(board, i, 0)
if board[i][len(board[0]) - 1] == 'O':
self.capture(board, i, len(board[0]) - 1)
for j in range(1, len(board[0]) - 1):
if board[0][j] == 'O':
self.capture(board, 0, j)
if board[len(board) - 1][j] == 'O':
self.capture(board, len(board) - 1, j)
for i in range(0, len(board)):
for j in range(0, len(board[0])):
if board[i][j] == 'O':
board[i][j] = 'X'
elif board[i][j] == 'S':
board[i][j] = 'O'