The problem says the input is a positive integer but the first test inputs 0. In my code that caused r = 0/0 error. Please change the wording to "input is non-negative".
Encode Roman Numerals
Sorted highest to lowest?
Find vampire numbers
Square a Number
Volume and area of a sphere
Return area of square
Mean and standard deviation of times in string
Create matrix with Gray code
Number of odd and even elements within matrix
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