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.
Extract leading non-zero digit
896 Solvers
421 Solvers
228 Solvers
Make a random, non-repeating vector.
617 Solvers
197 Solvers