Hi there,

def array2D(arr):

# want to find the maximum hourglass sum

# minimum hourglass sum = -9 * 7 = -63

maxSum = -63

for i in range(4):

for j in range(4):

# sum of top 3 elements

top = sum(arr[i][j:j+3])

# sum of the mid element

mid = arr[i+1][j+1]

# sum of bottom 3 elements

bottom = sum(arr[i+2][j:j+3])

hourglass = top + mid + bottom

if hourglass > maxSum:

maxSum = hourglass

return maxSum