The Diagonal Difference Challenge on HackerRank asks you to find the absolute difference between the sums of the diagonals in a square matrix. Here is an example of how to solve this challenge in Python:

```
def diagonal_difference(arr):
# calculate the sums of the diagonals
diag1 = sum(arr[i][i] for i in range(len(arr)))
diag2 = sum(arr[i][len(arr)-i-1] for i in range(len(arr)))
# calculate the absolute difference between the sums
return abs(diag1 - diag2)
# test the function with a sample input
arr = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
print(diagonal_difference(arr))
```

In this solution, we define a function `diagonal_difference`

that takes a square matrix `arr`

as input. The function calculates the sum of the main diagonal (top-left to bottom-right) and the sum of the secondary diagonal (top-right to bottom-left) using list comprehension and the `sum`

function.

The function then calculates the absolute difference between the sums of the diagonals using the `abs`

function and returns the result.

In the main part of the script, we test the function with a sample input matrix `arr`

and print out the result.

To use this function with HackerRank, simply copy and paste the `diagonal_difference`

function into the HackerRank editor and call it with the input matrix provided in the challenge.

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