Given a number, return the number of closed 'circles' in the base 10 numerical representation.
Note: the number 4 has no circles
Example:
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.
261 Solvers
Do Fast Fourier Transformation
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Switch matrix to a column vector
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07 - Common functions and indexing 6
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