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Grokking the Coding Interview Patterns in C++

Solution: First Unique Character in a String

Understand how to identify the first unique character in a string by tracking character frequencies with a hash map. Explore step-by-step algorithmic techniques and analyze time and space efficiency to apply this pattern effectively in coding interviews.

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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 ≤103\leq 10^{3} ...