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 .
Back to basics 25 - Valid variable names
sum of first 'n' terms
Determine the length of a string of characters
Flip the vector from right to left
Check if a matrix is a palindrome in all directions
Check if a rotated array was originally sorted
Check if two matrices are permutations of each other
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