[Google] Fill 2D Array

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(This question has been seen in the interviews of the following companies: Google)

Given a n*n  2D array. Fill the integer from 1 to n*n to this 2D array that makes the sum of each row, each column and the two diagonal equal. 

Google Online Assessment 2020 Fill 2D array

Solve the problem:
def fill2DArray(arr):

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