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".
Knight's Tour Checker
Inner product of two vectors
Back to basics 9 - Indexed References
Calculate the Number of Sign Changes in a Row Vector (No Element Is Zero)
How many digits are there?
Can I make a right triangle ?
Number of odd and even elements within matrix
Return area of square
Vector of numbers divisible by 3
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