Programmer Think

What is computer science? ● first of all, it is clear that computer science is not only the research of computer. Although computer has played an important role in the process of scientific development, it is only a tool, a tool without soul. The so-called computer science is actually the research on problems, solving problems and solutions pro ...

1. Stack 1.1 definition of stack Stack is a linear table that is restricted to insert and delete operations only at the end of the table We call the end that allows insertion and deletion as the top of the stack and the other end naturally as the bottom of the stack; A stack without data elements is called an empty stack; The stack is cha ...

1, Target The input parameter of sign is encrypted, but it has two obvious characteristics: one is the end of = = and the other is the beginning of R4iSK. With these two characteristics, we can start. 2, Steps Start with Base64 ==The approximate rate of the ending data is Base64. Let's Hook it first // Base64 var Base64Class = Java.use( ...

Quick sort Quick sort is an improvement of bubble sort. Its basic idea is to divide the data to be sorted into two independent parts through one-time sorting. All the data in one part is smaller than all the data in the other part, and then quickly sort the two parts of data according to this method. The whole sorting process can be recursive, ...

Today we are going to solve two problems of constructing binary trees; 106. Construct binary tree from middle order and post order traversal sequences 105. Construct binary tree from preorder and inorder traversal sequences First remember a conclusion: a binary tree can be uniquely constructed according to the pre order and middle order, and ...

Although I have written Java code for some time, I still can't figure it out and give up selectively as long as I see generics. However, I found that generics are used in many places when looking at the code of the company leaders today, so I'll sort out the generics I understand today. What is generics generic programming is a style or pa ...

leetcode official website: https://leetcode-cn.com/problems CS-Notes: https://www.cyc2018.xyz/ 1. Sum of two II - input ordered array (7 / 21-167) Problem solving ideas: Using double pointers, one pointer points to an element with a smaller value and one pointer points to an element with a larger value. Pointers to smaller el ...

step by step1. Introduction to the principle of kNN2. Handwriting dataset test3. Summary of advantages and disadvantages of the algorithm1, Introduction to the principle of kNN1.1 algorithm overviewGiven a training dataset, for a new input instance, find the K instances closest to the instance in the training dataset (that is, the K neighbors m ...

1. Introduction to JavaScript 2. ECMAScript and TypeScript overview 2.2.7 object oriented programming using classes class Book { constructor(title, pages, isbn) { this.title = title this.pages = pages this.isbn = isbn } printTitle() { console.log(this.title) } } let book = new Book('title', 'p ...

catalogue 1 Introduction 2 Genetic Algorithm 2.1 basic concepts of genetic algorithm 2.2 characteristics of genetic algorithm 2.3 program block diagram 3 Python code implementation 3.1 source code implementation 3.2 genetic algorithm package sko GA  3.2.1 case 1 3.2.2 case 2 4 reference 1 Introduction Genetic algorithm (GA ...