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Sliding Window

Longest Substring Without Repeating Characters

**Problem Statement:** Given a string `s`, find the length of the longest substring without repeating characters. **Hint / Expected Approach:** Hash map + sliding window **Edge Cases to Consider:** - (1) All same characters - (2) All unique characters - (3) Single character

Examples

Example 1
Input: "abcabcbb"
Output: 3
Example 2
Input: "bbbbb"
Output: 1
Example 3
Input: "pwwkew"
Output: 3

Constraints

  • ▪1 <= data.length <= 10^5
  • ▪Memory complexity must be O(1) or O(k)
  • ▪Ensure non-overlapping pointer access

Watch Out For Edge Cases

  • ▪All same characters
  • ▪All unique characters
  • ▪Single character
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