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Find First Non Repeating Character in a String

CodeSignal - Interview Practice (Arrays)

Question Description. Link

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 firstNotRepeatingCharacter(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 firstNotRepeatingCharacter(s) = '_'
    • There are no characters in this string that do not repeat
Solutions