Table of Contents
Reply content:
Home Backend Development PHP Tutorial javascript - How to quickly find the size of quantity a between the key name and the key name in array b

javascript - How to quickly find the size of quantity a between the key name and the key name in array b

Jul 06, 2016 pm 01:51 PM
javascript php

Variable a = 8 and array b = array(1,3,5,7,8.9,9,11.3);

Assume that the length of the array is unknown, the variable value is unknown, and the array key values ​​are arranged from small to large
How to quickly find the size of quantity a between the key name and the key name in array b

eg: a=8, between b[4] and b[5]

Reply content:

Variable a = 8 and array b = array(1,3,5,7,8.9,9,11.3);

Assume that the length of the array is unknown, the variable value is unknown, and the array key values ​​are arranged from small to large
How to quickly find the size of quantity a between the key name and the key name in array b

eg: a=8, between b[4] and b[5]

The length is unknown...it's unlikely...isn't it just b.length?...
Is there any better way to query this kind of query besides binary division...

Or you can encapsulate a class yourself, do a mapping when the array is created, and group the data according to size. How to group depends on your requirements, which can greatly improve the speed.
For example, to be simpler, group by integers, like this:

<code>class ClassA extends Array {
    constructor(...args) {
        super(...args);
        this.hash = [];
        for(let i = 0; i < this.length; i++) {
            if(!this.hash[Math.floor(this[i])]) this.hash[Math.floor(this[i])] = i;
        }
    }
}</code>
Copy after login
The

array is still the same array, just add a hash, which represents the starting subscript of the integer segment. For example, if you want to query the number 8.5, then you only need to query this.hash[Math.floor(8.5)] and this.hash[Math.floor(8.5) 1], two subscripts The data between the two hashes is enough. If the two hashes are empty, then just search forward and backward until the value is found. If the data is too sparse, you can make another hash for this hash and record the valid integer segments. Anyway, it is just space for time.

Obviously using binary search

Implementation method:

<code>1、先排序(冒泡、快速排序等,本题已优先排列好)
2、插入需要判断的元素,再排序
3、返回插入数组所在的键值</code>
Copy after login
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

AI Hentai Generator

AI Hentai Generator

Generate AI Hentai for free.

Hot Article

R.E.P.O. Energy Crystals Explained and What They Do (Yellow Crystal)
2 weeks ago By 尊渡假赌尊渡假赌尊渡假赌
Repo: How To Revive Teammates
4 weeks ago By 尊渡假赌尊渡假赌尊渡假赌
Hello Kitty Island Adventure: How To Get Giant Seeds
3 weeks ago By 尊渡假赌尊渡假赌尊渡假赌

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)

CakePHP Project Configuration CakePHP Project Configuration Sep 10, 2024 pm 05:25 PM

In this chapter, we will understand the Environment Variables, General Configuration, Database Configuration and Email Configuration in CakePHP.

PHP 8.4 Installation and Upgrade guide for Ubuntu and Debian PHP 8.4 Installation and Upgrade guide for Ubuntu and Debian Dec 24, 2024 pm 04:42 PM

PHP 8.4 brings several new features, security improvements, and performance improvements with healthy amounts of feature deprecations and removals. This guide explains how to install PHP 8.4 or upgrade to PHP 8.4 on Ubuntu, Debian, or their derivati

CakePHP Date and Time CakePHP Date and Time Sep 10, 2024 pm 05:27 PM

To work with date and time in cakephp4, we are going to make use of the available FrozenTime class.

CakePHP File upload CakePHP File upload Sep 10, 2024 pm 05:27 PM

To work on file upload we are going to use the form helper. Here, is an example for file upload.

CakePHP Routing CakePHP Routing Sep 10, 2024 pm 05:25 PM

In this chapter, we are going to learn the following topics related to routing ?

Discuss CakePHP Discuss CakePHP Sep 10, 2024 pm 05:28 PM

CakePHP is an open-source framework for PHP. It is intended to make developing, deploying and maintaining applications much easier. CakePHP is based on a MVC-like architecture that is both powerful and easy to grasp. Models, Views, and Controllers gu

How To Set Up Visual Studio Code (VS Code) for PHP Development How To Set Up Visual Studio Code (VS Code) for PHP Development Dec 20, 2024 am 11:31 AM

Visual Studio Code, also known as VS Code, is a free source code editor — or integrated development environment (IDE) — available for all major operating systems. With a large collection of extensions for many programming languages, VS Code can be c

CakePHP Creating Validators CakePHP Creating Validators Sep 10, 2024 pm 05:26 PM

Validator can be created by adding the following two lines in the controller.

See all articles