Longest Substring Without Repeating Characters: step-by-step visual explanation
Learn the Longest Substring Without Repeating Characters problem with a step-by-step DSA animation. Follow the Sliding Window (String) solution with synced C#, Python, and Java code.
Sliding Window (String) pattern
The right side grows the window. The left side removes letters whenever the current group breaks the rule.
Difficulty: Medium · Approach: Shrink when a letter repeats
Open Algorithm Atlas to watch the full interactive lesson and follow every execution step.