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.
Longest Divisor Run
We love vectorized solutions. Problem 1 : remove the row average.
find radius of cone
THE CALCULATOR OF LOVE
Set a Soroban Abacus
Triangle Numbers Below N
Test if a Number is a Palindrome without using any String Operations
Television Screen Dimensions
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