Longest Substring Problems

Definition

Classic sliding window problems requiring a Hash Set/Map to track character occurrences. Example: 'Longest Substring Without Repeating Characters'. As the `right` pointer encounters a duplicate, the `left` pointer advances until the duplicate is removed.

Explain Like I'm New

Reading a word letter by letter, keeping a list of letters you've seen. The exact second you read a letter you've already seen, you cut the word.

Interactive Coding Challenges

Longest Substring Without Repeating Characters

Solution Code

Console output will appear here...

O(N) Time, O(min(N, M)) Space.