Programmer Think

From the beginning of 2015 to the end of 2018, we have made a commodity system in meituan reviews for four years. A little summary. 2019/1/3   Business fast running, platform jogging 1. Fast business At the beginning of 2015, pan commodity system was started to explore ktv booking, and a set of ...

Catalog I. Preface 2, Factory mode 2.1 overview 2.2 code 2.3 summary 3, Abstract factory pattern 3.1 overview 3.2 code 3.3 summary 4, Comparison of two modes 4.1 draw "factory mode" and "abstract factory mode" in the same figure 4.2 further illustration of "factor ...

To create an empty collection, use s=set() d={}, default dictionary s=set() is an empty collection The elements in a collection are out of order and cannot be obtained from a corner label #Collection creation and traversal s={'Lin Qingxia','High Circle','Zhang Manyu'} for ele in s: print(ele) #Add t ...

Title: write several functions (1) Enter the names and employee numbers of ten employees; (2) Sort by employee number from small to large, and the order of names will be adjusted accordingly; (3) It is required to input an employee number, use half search to find out the name of the employee, input the employee number to be sea ...

priority queue For a special queue, the order of getting out elements is based on the priority (key) of the elements, and the order of getting out elements into the queue Action: find max (min), delete (max) Array: Linked list: Ordered array: Ordered list: Use binary search tree? NO Use complete binary ...

java learning resources https://www.bilibili.com/video/av37413483 1. Process control statements 1. Sequential structure From top to bottom, from left to right, brackets are counted first; public class Test { public static void main(String[] args) { //Execute from top to bottom int a = 10; Sys ...

Basic knowledge array and vector are continuous storage space, which can be accessed by arithmetic operation of pointer. List is also a container. The difference is that the elements of list are linked by a set of pointers: the forward pointer points to the next element, and the backward pointer points to the previous element. Therefore, the ar ...

Today, I'd like to summarize this search related topic I wrote a few days ago: My first thought: Divide the two arrays (suppose A, B) into A => A [0] ~ a [i] a [i] ~ a [n - I] and (0 < = I < n, n = = a.size()) B => B [0] ~ a [J] a [J] ~ a [n - J] and (0 < = J < m, M = = b.size()) ...

Basic knowledge A function must be declared before it can be called (used). The declaration of the function allows the compiler to check whether the subsequent usage is correct - whether there are enough parameters, whether the parameter type is correct, and so on. A function declaration does not have to provide a function body, but it must in ...

1.rsyslog                 This service is used to collect logs. It does not generate logs, but plays a collection role           vim  /etc/rsyslog.conf        ##View collection log information           /var/log/messages            ##Service information log            /var/log/secure            ##System login log            ...