Find longest unique substring

Q: Find longest unique substring

This is a Coding & Algorithms interview question from Lowe's for Software Engineer roles. View the full question and solution on PracHub.

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Question

Given a string s, find the length and one example of the longest substring of s that contains no repeated characters. If multiple answers exist, return any valid one. Explain your algorithm, prove its correctness at a high level, analyze time and space complexity, and discuss edge cases (e.g., empty string, all identical characters, presence of Unicode code points).

Find longest unique substring

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