Code Viblo

Code Viblo The Cross

Đề bài

Đáp án

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import sys

count_line = 0
arr = []
for line in sys.stdin:
    count_line += 1
    if count_line == 1:
        n = int(line)
    else:
        arr.append(list(line))

for i in range(1,n-1):
    for j in range(1,n-1):
        if arr[i][j] == '#' and arr[i - 1][j] == '#' and arr[i + 1][j] == '#' and arr[i][j-1] == '#' and arr[i][j+1] == '#':
            arr[i][j] = '.'
            arr[i + 1][j] = '.'
            arr[i - 1][j] = '.'
            arr[i][j + 1] = '.'
            arr[i][j - 1] = '.'
for i in range(n):
    for j in range(n):
        if arr[i][j] == '#':
            print('NO')
            exit()
print("YES")