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README.md

Rotate for a Max

Difficulty: 7 kyu

Link: https://www.codewars.com/kata/56a4872cbb65f3a610000026

Let us begin with an example:

Take a number: 56789. Rotate left, you get 67895.

Keep the first digit in place and rotate left the other digits: 68957.

Keep the first two digits in place and rotate the other ones: 68579.

Keep the first three digits and rotate left the rest: 68597. Now it is over since keeping the first four it remains only one digit which rotated is itself.

You have the following sequence of numbers:

56789 -> 67895 -> 68957 -> 68579 -> 68597

and you must return the greatest: 68957.

Task

Write function max_rot(n) which given a positive integer n returns the maximum number you got doing rotations similar to the above example.

So max_rot (or maxRot or ... depending on the language) is such as:

  • max_rot(56789) should return 68957
  • max_rot(38458215) should return 85821534