Longest Substring Without Repeating Characters Problem Statement

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

Example:

Input:

"abacb"

Output:

3

Explanation:

The longest substring without repeating characters is "acb" with a length of 3.

Constraints:

0

Question

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

"abacb"

The longest substring without repeating characters is "acb" with a length of 3.

You do not need to print anything. The function should be implemented to return the answer.

Accepted Answer

Find the length of the longest substring without repeating characters in a given string.

Use a sliding window approach to keep track of the longest substring without repeating characters.
Use a hashmap to store the index of each character in the string.
Update the start index of the window when a repeating character is encountered.
Calculate the maximum length of the substring as you iterate through the string.
Return the maximum length of the substring at the end.

Popular interview questions of Technical Lead