first_not_repeating_character.md

Back

First Not repeating Character

Challenge description

Given a string s consisting of small English letters, find and return the first instance of a non-repeating character in it. If there is no such character, return '_'.

Example

• For s = "abacabad", the output should be solution(s) = 'c'.

  There are 2 non-repeating characters in the string: 'c' and 'd'. Return c since it appears in the string first.

• For s = "abacabaabacaba", the output should be solution(s) = '_'.

  There are no characters in this string that do not repeat.

Solution

Solved with Rust