Reverse digits of a number.
For example, return 321 for the input 123 .
The left-hand zeros can be discarded. For example, input 10 will return 1 .
Sum the elements in either diagonal of a square matrix
Who invented zero?
Sum the 'edge' values of a matrix
Add the odd numbers
Check if a rotated array was originally sorted
Check if two matrices are permutations of each other
Check if a matrix is a palindrome in all directions
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