Programmer Think

PS: Sword finger offer is not only an interview guide that many students will refer to when looking for a job, but also an algorithm Guide (the main reason why it is so popular is that it provides a step-by-step optimization solution, which I think is very friendly). Now many Internet algorithm interview questions can be found here. For the con ...

**Seven principles of design mode** 1.Closed development principle: open to expansion and closed to modification. When the program needs to be expanded, the original code cannot be modified to form a hot plug effect. 2.Single responsibility principle: a class interface or method is responsible for only one responsibility, reducing code ...

Concerning the definition of prime number: prime number is also called prime number. A natural number greater than 1 is called a prime number if it cannot be divided by any other natural number except 1 and itself; otherwise it is called a total number (specifying that 1 is neither a prime number nor a sum). Algorithms for generating prime num ...

Java collections brief introduction Java collections can be roughly divided into four systems: set, list, Queue and map. Set represents unordered and unrepeatable collections; List represents an ordered and repeated set; Map represents a set with mapping relationship, and Java 5 adds a Queue system set to represent a Queue set implementation ...

1. Question 5 of the longest palindrome substring force deduction Substring: substring must be continuous, which is different from the concept of subsequence Subsequence: Where the violent solution can be optimized: palindromes are judged only when the length of the substring is > the current maximum length, Is there anything that can be ...

Introduction: today, I was laughed by this question and woke up by this question. It turns out that I haven't really understood KMP algorithm Let's talk about how interesting this problem is: I: For those who are familiar with object-oriented encapsulation, only one line of code is needed to solve this problem. Hahaha, I was laughed at. The fo ...

@TOC # Spring Series Record every step in the program u auth:huf Reply: In the front of the article, I will reply to some students'questions. Note that if the return return value is not written when using InstantiationAwareBeanPostProcessor;This is in the process of creating objects;This will cause the @Autowired injection inside the object ...

Conceptual understanding 1.LRU is the abbreviation of Least Recently Used, that is, the Least Recently Used page replacement algorithm. It serves the virtual page storage management and makes decisions according to the usage of pages after they are transferred into memory. Since it is impossible to predict the future usage of each page, onl ...

1. sql Title Brushing There are two main purposes to do this topic, preparing for the interview and understanding the business logic and thinking style of the data analyst in practice. Most of the data analysts are biased toward the business side, with the indicators increasing or decreasing, how to analyze, from which angles to analyze, c ...

preface Hello, I'm Xiaoxiong, a programmer from Huawei. Today, I'll bring you a high-frequency interview question related to arrays. This question is the interview question of big companies such as Google, Tencent, apple and Amazon, that is, the 1122 question on force buckle - the relative ranking of arrays. This paper mainly introduces the s ...