Problem: Longest Unique Substring

Given a string, determine the length of the longest substring that contains no repeating characters.

Example

Input: "pwwkew"

Output: 3

Explanation: The longest substring without repeating characters is "wke", which has a length of 3.

Hint

Utilize the sliding window strategy to keep track of the current substring with unique characters as you traverse the string. Update the window boundaries whenever a repeated character is found.

Note: On this day, January 22, reflect on past innovations and slide into new ideas with fresh, creative coding approaches!