Skip list Definition Searching in a dictionary of n number pairs described by an ordered linked list requires at most n key comparisons. If a pointer is added to the middle node of the linked list, the number of comparisons can be reduced to n/2 + 1. At this time, in order to find a […]
Tag: key-value
Decrypting a Map in Java: How to efficiently manipulate key-value pairs?
Foreword Map is one of the very important data structures in Java. It stores key-value pairs and can quickly find the corresponding value through the key. It is one of the most frequently used data structures in our actual development. This article aims to introduce common Map implementations in Java, their advantages and disadvantages, and […]
Decrypting a Map in Java: How to efficiently manipulate key-value pairs?
Foreword Map is one of the very important data structures in Java. It stores key-value pairs and can quickly find the corresponding value through the key. It is one of the most frequently used data structures in our actual development. This article aims to introduce common Map implementations in Java, their advantages and disadvantages, and […]
Python dictionary and collection operation guide: creating, obtaining values, modifying and deleting key-value pairs, full analysis of copying and traversing methods
Article directory Dictionary Create dictionary Get the value in the dictionary Modify dictionary Delete key-value pairs from dictionary copy dictionary dictionary comprehension Traverse dictionary Use keys() method Use the values() method Use items() method summary set Create a collection Set operations Set operations summary Recommended Python boutique columns Basic knowledge of python (0 basic introduction) […]
Spark [RDD Programming (3) Key-value Pair RDD]
Introduction Key-value pair RDD means that each RDD element is a key-value pair of type (key, value). It is a common RDD and can be applied to many scenarios. Because after all, through our previous study of Hadoop, we can see that the processing of data is basically unified batch processing in the form of […]
Java+HttpClient library is a tool method that encapsulates get, post in key-value format, and post request in json format [Hangzhou Multi-tester_Wang Sir]…
package cn.duoceshi.springbootdemo.utils; import cn.duoceshi.springbootdemo.Enum.CodeEnum; import cn.duoceshi.springbootdemo.model.HttpClientResponse; import org.apache.http.Header; import org.apache.http.NameValuePair; import org.apache.http.client.entity.UrlEncodedFormEntity; import org.apache.http.client.methods.CloseableHttpResponse; import org.apache.http.client.methods.HttpGet; import org.apache.http.client.methods.HttpPost; import org.apache.http.client.methods.HttpRequestBase; import org.apache.http.client.utils.URIBuilder; import org.apache.http.entity.ContentType; import org.apache.http.entity.StringEntity; import org.apache.http.impl.client.CloseableHttpClient; import org.apache.http.impl.client.HttpClients; import org.apache.http.message.BasicNameValuePair; import org.apache.http.util.EntityUtils; import java.io.IOException; import java.net.URI; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; /** * No. 2023-8-30 Multiple testers * Tool methods […]
Android: MMKV – Key-Value Store
Directory 1. Introduction to MMKV 1. Features and advantages: 2. User Guide: 3. Dependent packages: Second, the common method of MMKV 1. Initialize and obtain the instance: 2. Store data: 3. Read data 4. Delete data 5. Other operations: 3. Examples of MMKV usage MainActivity: activity_main: operation result: 4. Comparison between MMKV and SharedPreferences 1. […]
Bit operation–Generate the corresponding integer according to the (mask, vavlue) key-value pair
Article directory Function Description example analyze MACRO_CHOOSE_HELPER MACRO_GLUE(x, y) x y MV(m, v) MASK_VALx Function description It is used to generate an integer according to the incoming mask and the corresponding value, and the unspecified mask bit is cleared. MASK_VAL(BIT(1), 1), set bit1 to 1, the result is 2. MASK_VAL(BIT(1), 1, BIT(2), 1), set bit1 […]
In-depth analysis of Redis: a fast and efficient key-value storage system
In-depth analysis of Redis: a fast and efficient key-value storage system 1. Introduction In modern applications, high performance and scalability are critical. Redis (Remote Dictionary Server) is a fast and efficient key-value storage system with excellent performance and flexible data structure. This article will deeply analyze the characteristics, installation and configuration, basic operations, advanced functions, […]
Redis key-value pair mapping relationship storage-Dict
Basic overview Redis is a key-value (Key-Value Pair) database, which can quickly add, delete, modify and query according to the key. And The mapping relationship between key and value is realized through Dict. Dict consists of three parts: Hash Table (DictHashTable), Hash Node (DictEntry), Dictionary (Dict) Hash table: Hash node: size can only be 2^n […]