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".
Return a list sorted by number of occurrences
Remove the two elements next to NaN value
Given a matrix, swap the 2nd & 3rd columns
subtract central cross
What number has this problem?
How many digits are there?
Make a vector of prime numbers
Create matrix with Gray code
Number of odd and even elements within matrix
Volume and area of a sphere
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