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 .
Make a checkerboard matrix
Rotate a Matrix
Area of a circle
Change string to number
Check if a matrix is a palindrome in all directions
Check if two matrices are permutations of each other
Check if a rotated array was originally sorted
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