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.
Read a column of numbers and interpolate missing data
Find perfect placement of non-rotating dominoes (easier)
Find nearest prime number less than input number
Find the hypotenuse
Vectors counting by 2
Generalized N-Cards Problem
Guess the Coefficients!
Reverse the Words (not letters) of a String
N-Dimensional Array Slice
Generate N equally spaced intervals between -L and L
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