The Spiral Sum

Walking the Spiral

Imagine an $N imes N$ matrix filled with numbers $1, 2, dots, N^2$ in a spiral order starting from the top-left. In this mission, you don't need a matrix—calculate the sum of values on the diagonals via a loop.

The Assignment

Your function receives a parameter size (an odd number).

1. Initialize totalSum = 1.
2. Use a loop from 3 up to size (step 2).
3. In each shell, the four corners are k^2, k^2 - (k-1), k^2 - 2(k-1), and k^2 - 3(k-1).
4. Add these to totalSum and print the final result.