class Solution:

"""

@param A: Initial chessboard

@param F: Flipped coordinates

@return: return to the flipped board.

"""

def ChessPieceRotation(self, A, F):

# write your code here

rows, cols = len(A), len(A[0])

records = [[0 for i in range(cols)] for i in range(rows)]

for f in F:

x, y = f[0] - 1, f[1] - 1;

if (y - 1) >= 0: # 上

records[x][y - 1] += 1

if (y + 1) < 4: # 下

records[x][y + 1] += 1

if (x - 1) >= 0: # 左右

records[x - 1][y] += 1

if (x + 1) < 4: #右

records[x + 1][y] += 1

for row in range(rows):

for col in range(cols):

if (records[row][col] % 2) != 0:

A[row][col] = 1 - A[row][col]

return A

# easy: https://www.lintcode.com/problem/chess-piece-rotation/