Home Web Front-end JS Tutorial Longest Substring Without Repeating Characters with Sliding Window Technique

Longest Substring Without Repeating Characters with Sliding Window Technique

Dec 10, 2024 am 11:14 AM

Let's break down the solution steps and see how each step works

We assume we received the following input:
Longest Substring Without Repeating Characters with Sliding Window Technique

We will create an empty set to store the letters we have encountered and a variable to keep the longest substring we have found.
Longest Substring Without Repeating Characters with Sliding Window Technique

Now, we will check if the value pointed to by right exists in the set. If it doesn't exist, we will add it to the set and move right one step forward. After that, we will update the longest substring by comparing the size of the set to the value stored in the longSubstr variable.
Longest Substring Without Repeating Characters with Sliding Window Technique

We will check if the value pointed to by right is in the set. We see that it is not, so we add it to the set and increment right by 1. After that, we take the max between the size of the set and the value in longSubstr.
Longest Substring Without Repeating Characters with Sliding Window Technique

We check if the value pointed to by right is in the set, meaning c is not in the set. So, we add it to the set, increment right by 1, and check the max substring.
Longest Substring Without Repeating Characters with Sliding Window Technique

Now, we check if the value pointed to by right, which is a, exists in the set. We see that it does, so we remove it from the set and move left one step forward.
Longest Substring Without Repeating Characters with Sliding Window Technique

The value pointed to by right is b, and it exists in the set.

Therefore, we move the left pointer one step forward and remove b from the set.
Longest Substring Without Repeating Characters with Sliding Window Technique

Now we see that b is in the set, so we remove the value pointed to by left and move left one step forward.
Longest Substring Without Repeating Characters with Sliding Window Technique

The value pointed to by right is c, and it exists in the set.
Therefore, we remove it from the set and move left one step forward.
Longest Substring Without Repeating Characters with Sliding Window Technique

We will continue with the same technique until step 17 and will get:
Longest Substring Without Repeating Characters with Sliding Window Technique

Here is a JavaScript implementation

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

function longestSubstring(s) {

  let left = 0

  let right = 0

 

  let maxSubstr = 0

  let set = new Set()

 

  while (right < s.length) {

    const currentChar = s[right]

 

    if (!set.has(currentChar)) {

      set.add(currentChar)

      right++

      maxSubstr = Math.max(maxSubstr, right - left) // Update max substring length

    } else {

      set.delete(s[left])

      left++

    }

  }

 

  return maxSubstr

}

 

let inputString = 'abcabcbb'

console.log(longestSubstring(inputString)) // Output: 3 ("abc")

Copy after login

The above is the detailed content of Longest Substring Without Repeating Characters with Sliding Window Technique. For more information, please follow other related articles on the PHP Chinese website!

Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

Video Face Swap

Video Face Swap

Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Tools

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

What should I do if I encounter garbled code printing for front-end thermal paper receipts? What should I do if I encounter garbled code printing for front-end thermal paper receipts? Apr 04, 2025 pm 02:42 PM

Frequently Asked Questions and Solutions for Front-end Thermal Paper Ticket Printing In Front-end Development, Ticket Printing is a common requirement. However, many developers are implementing...

Demystifying JavaScript: What It Does and Why It Matters Demystifying JavaScript: What It Does and Why It Matters Apr 09, 2025 am 12:07 AM

JavaScript is the cornerstone of modern web development, and its main functions include event-driven programming, dynamic content generation and asynchronous programming. 1) Event-driven programming allows web pages to change dynamically according to user operations. 2) Dynamic content generation allows page content to be adjusted according to conditions. 3) Asynchronous programming ensures that the user interface is not blocked. JavaScript is widely used in web interaction, single-page application and server-side development, greatly improving the flexibility of user experience and cross-platform development.

Who gets paid more Python or JavaScript? Who gets paid more Python or JavaScript? Apr 04, 2025 am 12:09 AM

There is no absolute salary for Python and JavaScript developers, depending on skills and industry needs. 1. Python may be paid more in data science and machine learning. 2. JavaScript has great demand in front-end and full-stack development, and its salary is also considerable. 3. Influencing factors include experience, geographical location, company size and specific skills.

Is JavaScript hard to learn? Is JavaScript hard to learn? Apr 03, 2025 am 12:20 AM

Learning JavaScript is not difficult, but it is challenging. 1) Understand basic concepts such as variables, data types, functions, etc. 2) Master asynchronous programming and implement it through event loops. 3) Use DOM operations and Promise to handle asynchronous requests. 4) Avoid common mistakes and use debugging techniques. 5) Optimize performance and follow best practices.

How to achieve parallax scrolling and element animation effects, like Shiseido's official website?
or:
How can we achieve the animation effect accompanied by page scrolling like Shiseido's official website? How to achieve parallax scrolling and element animation effects, like Shiseido's official website? or: How can we achieve the animation effect accompanied by page scrolling like Shiseido's official website? Apr 04, 2025 pm 05:36 PM

Discussion on the realization of parallax scrolling and element animation effects in this article will explore how to achieve similar to Shiseido official website (https://www.shiseido.co.jp/sb/wonderland/)...

The Evolution of JavaScript: Current Trends and Future Prospects The Evolution of JavaScript: Current Trends and Future Prospects Apr 10, 2025 am 09:33 AM

The latest trends in JavaScript include the rise of TypeScript, the popularity of modern frameworks and libraries, and the application of WebAssembly. Future prospects cover more powerful type systems, the development of server-side JavaScript, the expansion of artificial intelligence and machine learning, and the potential of IoT and edge computing.

How to merge array elements with the same ID into one object using JavaScript? How to merge array elements with the same ID into one object using JavaScript? Apr 04, 2025 pm 05:09 PM

How to merge array elements with the same ID into one object in JavaScript? When processing data, we often encounter the need to have the same ID...

The difference in console.log output result: Why are the two calls different? The difference in console.log output result: Why are the two calls different? Apr 04, 2025 pm 05:12 PM

In-depth discussion of the root causes of the difference in console.log output. This article will analyze the differences in the output results of console.log function in a piece of code and explain the reasons behind it. �...

See all articles