Find longest unique-character substring

Q: Find longest unique-character substring

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

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Question

Given a string s, return the length of the longest substring without repeating characters. Explain and implement an O(n) sliding-window solution using a hash map or set. Discuss time and space complexity, and note any changes needed to correctly handle Unicode characters.

Find longest unique-character substring

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