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.
Filter AC, pass DC
Find number of days
Sum the Digits of a Number
Is this triangle right-angled?
N-Dimensional Array Slice
Guess the Coefficients!
The Bomb Problem
THE CALCULATOR OF LOVE
Next Lower Power of B
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