First Unique Character in a String

Try to solve the First Unique Character in a String problem.


For a given string of characters, s, your task is to find the first non-repeating character and return its index. Return 1-1 if there’s no unique character in the given string.


  • 11 \leq s.length 103\leq 10^{3}
  • Only lowercase English letters are accepted.
  • There are no spaces in the string.


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