4 kyu
Next smaller number with the same digits
4,206 of 11,791LesRamer
Description:
Write a function that takes a positive integer and returns the next smaller positive integer containing the same digits.
For example:
next_smaller(21) == 12
next_smaller(531) == 513
next_smaller(2071) == 2017
Return -1 (for Haskell: return Nothing, for Rust: return None), when there is no smaller number that contains the same digits. Also return -1 when the next smaller number with the same digits would require the leading digit to be zero.
next_smaller(9) == -1
next_smaller(135) == -1
next_smaller(1027) == -1 # 0721 is out since we don't write numbers with leading zeros
- some tests will include very large numbers.
- test data only employs positive integers.
The function you write for this challenge is the inverse of this kata: "Next bigger number with the same digits."
Strings
Mathematics
Algorithms
Similar Kata:
Stats:
| Created | Nov 28, 2015 |
| Published | Dec 3, 2015 |
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