Given a number, return the number of closed 'circles' in the base 10 numerical representation.
Note: the number 4 has no circles
8819 -> 5
Interpolating on a string (the ASCII values) is an interesting idea even though the long interpolation string could be reduced by subtracting '0', but at the expense of a "longer" solution.
Distance walked 3D
Back to basics 19 - character types
Check if number exists in vector
Return area of square
Find the dimensions of a matrix
Cache me Outside
Right Triangle Side Lengths (Inspired by Project Euler Problem 39)
THE CALCULATOR OF LOVE
N-Dimensional Array Slice
First N Perfect Squares
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