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".
Sum of diagonal of a square matrix
Replace Vector Elements
Say something funny
Is this triangle right-angled?
Create matrix with Gray code
How many digits are there?
Volume and area of a sphere
Return area of square
Mean and standard deviation of times in string
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