Longest Substring without Repeating Characters
Explore the sliding window approach to identify the longest substring without repeating characters. This lesson helps you understand problem constraints and apply an efficient strategy to solve substring challenges in coding interviews.
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Statement
Given a string, str, return the length of the longest substring without repeating characters.
Constraints:
-
str.length strconsists of English letters, digits, and spaces.
Examples
Understand the problem
Let’s take a moment to make sure you’ve correctly understood the problem. The quiz below helps us to check if you’re solving the correct problem:
Longest Substring Without Repeating Characters
What should be the output if the following string is given as an input?
s = “conceptoftheday”
8
6
5
13
Figure it out!
We have a game for you to play. Rearrange the logical building blocks to develop a clearer understanding of how to solve this problem.
Try it yourself
Implement your solution in the following coding playground:
import java.util.*;public class Main{public static int findLongestSubstring(String str) {// Replace this placeholder return statement with your codereturn -1;}}