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Digit Degree

https://app.codesignal.com/arcade/intro/level-9/hoLtYWbjdrD2PF6yo

Challenge description

Let's define digit degree of some positive integer as the number of times we need to replace this number with the sum of its digits until we get to a one digit number.

Given an integer, find its digit degree.

Example

  • For n = 5, the output should be solution(n) = 0;

  • For n = 100, the output should be solution(n) = 1.

    1 + 0 + 0 = 1.

  • For n = 91, the output should be solution(n) = 2.

    9 + 1 = 10 -> 1 + 0 = 1.

Solution

Solved with Rust