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".
Back and Forth Rows
Multiply 2 numbers
sum of non-primes
MATCH THE STRINGS (2 CHAR) very easy
Number of odd and even elements within matrix
Create matrix with Gray code
Mean and standard deviation of times in string
Make a vector of prime numbers
Return area of square
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