Longest Substring without Repeating Characters

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

Approach:
We use a Hash Map and the Sliding Window Algorithm to tackle this question. We use a hash table char_map to store characters and their indices.
The left pointer indicates the start of the current window. We iterate through the string using the right pointer.
If the current character is already in char_map and its index is within the current window, we update the left pointer to the next position after the repeated character.
We update the index of the current character in char_map and the maximum length when a longer non-repeating substring is found.

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