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Preface As a cached database, Redis currently has a large usage in the market. Most people use its string format storage in their work. For the rest of the data structure, it is rarely used. The basic data structure of Redis includes: string, hash, list, set, sorted set. These five data structures are often used in different scenarios in ...

Intersection of two unidirectional linked lists Problem Description: There are two one-way linked lists. They may or may not intersect. If it intersects, it returns the intersecting node; if it does not intersect, it returns null. There are only three cases when two one-way linked lists intersect. The problem of linked list intersection is ...

preface Set set: specifically reflected in the non repeatable nature. The feature of this set is that it will not store duplicate elements and will store unordered elements (the order of storage and retrieval is not necessarily the same) hashset: it is a classic implementation class of set. The bottom layer is implemented by using the key val ...

** 1. What is a lookup table ** In daily life, we have to do some searching work almost every day, looking up someone's phone number in the phone book; Find a specific file in the folder of the computer, and so on. This section mainly introduces the data structure used for lookup operation - lookup table. A lookup table is a collection of da ...

350. Intersection of two arrays II Given two arrays, write a function to calculate their intersection. Example 1: Input: nums1 = [1,2,2,1], nums2 = [2,2] Output: [2,2] Example 2: Input: nums1 = [4,9,5], nums2 = [9,4,9,8,4] Output: [4,9]   explain: The number of occurrences of each element in the output result shall be consistent with the m ...

1, Overview of classes and interfaces Advantages and functions of Java collection framework Using a mature collection framework helps us write efficient and stable code conveniently and quicklyLearning the data structure knowledge behind it will help us understand the advantages, disadvantages and usage scenarios of each collection ...