Find the Longest Substring Without Repeating Characters

A Quick Overview

Given a string, find the length of the longest substring without repeating characters.

Problem Statement

Input: S = “abcabcbb”  Output: 3  Explanation: “abc” is the longest substring without repeating characters among all the substrings.

Examples

1. Generate all substrings of the given string. 2. Check if the substring has all unique characters. 3. Return the max length of substrings with unique characters

Bruteforce Approach

Time Complexity: O(N^3), where N is string length  Space Complexity: O(min(N, M)), as HashSet is used. N is the string length, and M is the size of the substring.

It only checks if the new character added to the substring is a duplicate rather than checking all substrings for duplicates. This avoids repeating tasks and increases efficiency.

Sliding Window Approach

Time Complexity: O(N^2), where N is string length  Space Complexity: O(min(N, M)), as HashSet is used. N is the string length, and M is the size of the substring.

Explore different approaches and learn how to implement them in various programming languages.