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".
Increment a number, given its digits
How to subtract?
Maximum value in a matrix
2倍してみよう - ここからスタート！
Mersenne Primes vs. All Primes
Volume and area of a sphere
Return area of square
How many digits are there?
Can I make a right triangle ?
Make a vector of prime numbers
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