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.
Change the sign of even index entries of the reversed vector
Basics: 'Find the eigenvalues of given matrix
Find the logic
Simple equation: Annual salary
Generate N equally spaced intervals between -L and L
Cache me Outside
Square Digits Number Chain Terminal Value (Inspired by Project Euler Problem 92)
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