LittleBoyQTi

Given a string  s , 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. Input/Output [time limit] 500ms (cpp) [input] string s A string that contains only lowercase English letters. Guaranteed constraints: 1 ≤ s.length ≤ 10 5 . [output] char The first non-repeating character in  s , or  '_'  if there are no characters that do not repeat. My this solution: char firstNotRepeatingCharacter(std::string s) {     char temp = ' ';     for (int i...