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Grokking the Coding Interview Patterns in C#

Solution: First Unique Character in a String

Discover how to identify the first unique character in a lowercase string by tracking character occurrences with a hash map in C#. Learn the steps to increment counts, traverse the string, and return the index of the first non-repeating character or -1 if none exists.

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Statement

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.

Constraints:

  • Only lowercase english letters are accepted.
  • There are no spaces in
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