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Grokking the Coding Interview Patterns in Python

Solution: First Unique Character in a String

Explore how to identify the first unique character in a string by tracking character counts with a hash map. Understand the approach to solve this common coding interview problem efficiently, focusing on time and space complexity.

We'll cover the following...

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 ≤103\leq 10^{3} ...