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Problem: Longest Substring Without Repeating Characters

Explore how to determine the longest substring without repeating characters in a given string. Understand and implement the sliding window technique with a HashMap in Java to solve this common string algorithm problem efficiently, analyzing its time and space complexity.

Statement

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

A substring is a contiguous sequence of characters within a string.

Note: There may be multiple valid substrings of the same maximum length. Return only the length.

Constraints:

  • 00 \leq s.length 5×104\leq 5 \times 10^4

  • s consists of English ...