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.
Make the vector [1 2 3 4 5 6 7 8 9 10]
All your base are belong to us
Given area find sides
The Dark Side of the Die
Solve the Sudoku Row
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