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Grokking the Coding Interview Patterns in Python

Solution: First Unique Character in a String

Explore how to find the first unique character in a string by tracking character occurrences with a hash map. Understand how to implement this efficient solution and analyze its time and space complexity to solve related coding interview 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 ...