 # Python NZEC on KFORK but AC using C++

I was trying to solve the KFORK problem. I have a solution in C++ that I got AC with, but my identical Python3 solution gets an NZEC. I’m new to using Python on CodeChef, so maybe there is something basic I am missing. Can someone please take a look at the following code and see if something is wrong?

``````
def is_X_Y_valid(board, X, Y):
return (X >= 0 and X < len(board) and
Y >= 0 and Y < len(board[X]))

T = int(input())

for _ in range(0, T):
N, M = (int(i) for i in input().split())

board = [[False] * N for x in range(N)]
xAttacked = [False] * N
yAttacked = [False] * N
mainDiagAttacked = [False] * (2 * N - 1)
offDiagAttacked = [False] * (2 * N - 1)

for _ in range(0, M):
X, Y = (int(i) for i in input().split())
X -= 1
Y -= 1
board[X][Y] = True
xAttacked[X] = True
yAttacked[Y] = True
mainDiagAttacked[N - 1 + X - Y] = True
offDiagAttacked[X + Y] = True

forkedKnights = 0
for x in range(0, N):
for y in range(0, N):
if board[x][y]:
continue

if (xAttacked[x] or yAttacked[y] or
mainDiagAttacked[N - 1 + x - y] or
offDiagAttacked[x + y]):
continue

attacking = 0
offsets = [[[-2, 2], [-1, 1]], [[-1, 1], [-2, 2]]]
for a, b in offsets:
for i in a:
for j in b:
if is_X_Y_valid(board, x + i, y + j):
if board[x + i][y + j]:
attacking += 1

if attacking >= 2:
forkedKnights += 1

print(forkedKnights)

``````

test1 Post must be at least 20 characters

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test2 Post must be at least 20 characters

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test2 Post must be at least 20 characters

test2 Post must be at least 20 characters

test2 Post must be at least 20 characters

test2 Post must be at least 20 characters

test2 Post must be at least 20 characters

test2 Post must be at least 20 characters

test2 Post must be at least 20 characters

test2 Post must be at least 20 characters

test2 Post must be at least 20 characters

test2 Post must be at least 20 characters

test2 Post must be at least 20 characters