Leetcode Problem 3. Longest Substring Without Repeating Characters

3. Longest Substring Without Repeating Characters

Leetcode Solutions

Initialize a hashmap to store character indices.
Initialize two pointers, start and max_length, to 0.
Iterate over the string with an index i.
If the character at index i is in the hashmap and its stored index is greater than or equal to start, update start to the stored index + 1.
Update the hashmap with the current character and its index i.
Update max_length to the maximum of max_length and i - start + 1.
Return max_length after the iteration.

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