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Deep understanding of pointers preface First, let's understand the concept of the following pointers: A pointer is a variable used to store an address, which identifies a piece of memory space.The size of the pointer is fixed at 4 or 8 bytes (32 or 64 bits).Pointers are typed, which determines the step size of pointer operation and t ...

1, Overview HashMap The general structure of the hash table is shown in the figure below. The hash table is an array. We often call each node in the array a bucket, and each node in the hash table is used to store a key value pair. When inserting elements, if there is a conflict (that is, multiple key value pairs are mapped to the same buc ...

1, Title [LeetCode-21] Merge the two ascending linked lists into a new} ascending linked list and return. The new linked list is composed of all nodes of a given two linked lists.   Example 1: Input: l1 = [1,2,4], l2 = [1,3,4] Output: [1,1,2,3,4,4] Example 2: Input: l1 = [], l2 = [] Output: [] Example 3: Input: l ...

The worst case is the linear time selection algorithm Reference: [algorithm] Introduction to algorithm: https://www.bilibili.com/video/BV1Tb411M7FA?p=6 Ask questions: find the K-th largest number from an array, that is, the TOPK problem. This problem is often encountered in interviews and research. Then, how should this problem be solved? Of ...

1. Basic concept of stack Stack is a restrictive linear table, which limits the insertion and deletion of linear tables to only one end of the table. Generally, the end of the table that allows insertion and deletion is called the Top of the stack. Therefore, the current position of the Top of the stack changes dynamically, which is indica ...

preface The so-called window is a continuous closed set, which is generally represented by left and right pointers, but it will also change according to the meaning of the question, such as the following question 187. Repetitive DNA sequences All DNA consists of A series of nucleotides abbreviated as' A ',' C ',' G 'and'T', such as " ...

catalogue Member variable Constructor add to Return queue header element / out of queue operation delete Analysis of bottom binary heap algorithm summary Talk about the heap sorting algorithm Member variable public class PriorityQueue<E> extends AbstractQueue<E> implements java.io.Serializable { private static fi ...

438. Find all letter words in the string Meaning: Given two strings S and p, find the substrings of all ectopic words of p in s, and return the starting indexes of these substrings. The order in which answers are output is not considered. Ectopic words refer to strings with the same letters but arranged differently. Example 1: input: ...

Blog home page (4 messages) Xiao Wu_ Xiao Wu has an idea_ CSDN blog - notes, java,leetcode domain bloggersWelcome to pay attentiongive the thumbs-upCollection and messageHeaven rewards diligence. Diligence can make up for weakness. Come on with Xiao Wu17-year-old freshman, limited level, please give advice, thank you very much!  Refer to t ...

7-1 symmetrical sorting (25 points) The title comes from PTA You work for the albatross circus with a group of ugly stars as pillars. You have just completed a program that outputs their list in non descending order according to the length of the stars' name string (that is, the length of the current name is at least the same as that of th ...