Longest Substring Without Repeating Characters
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What is Longest Substring Without Repeating Characters?
Find the length of the longest substring that contains no duplicate characters. You expand the right pointer and shrink the left pointer whenever a duplicate enters the window, using a set to track current characters. This is the canonical variable-size sliding window problem and teaches you the expand-then-shrink rhythm that most substring problems follow.
Free resources to learn Longest Substring Without Repeating Characters
More in stage 8: Sliding Window
Longest Substring Without Repeating Characters: common questions
Can I learn Longest Substring Without Repeating Characters in Hindi?
This lesson is written in English. Once you sign in, open it in the interactive course and ask the AI tutor to explain Longest Substring Without Repeating Characters in Hindi or Hinglish. The tutor answers from this lesson’s own text, so it stays on the syllabus, and it runs on your own Google, OpenAI or Anthropic key.
Is this Longest Substring Without Repeating Characters tutorial for beginners?
It is lesson 42 of 137 in the free LeetCode roadmap, in stage 8, Sliding Window. If you are new to LeetCode, start from stage 1 and come back here in order; if you already know the earlier stages, this lesson stands on its own.