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Grokking the Coding Interview Patterns in Go

Solution: First Unique Character in a String

Understand how to find the first unique character in a string by using a hash map to count character occurrences. This lesson guides you through a method to return the index of the first non-repeating character or -1 if none exists. Learn to implement a solution with linear time complexity and constant space usage, reinforcing your ability to handle string manipulation and tracking problems.

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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:

  • 1≤1 \leq s.length ...