Programmer Think

I. overview The red black tree is a balanced binary tree. This kind of tree can carry out efficient middle order traversal. By constraining the color of each node on any simple path from root to leaf, it is ensured that no path is twice as long as other paths, so it is nearly balanced. We use red black tree when it has less rotation to keep bal ...

Chain code and platform of Fabric 1.0 source code Notes 1. Overview of platforms The platforms code is centralized in the core/chaincode/platforms directory. core/chaincode/platforms directory, the programming language platform implementation of chain code, such as golang or java. Platform.go, platform interface definition, and platform related ...

The class libraries involved in this article, configparser, xlrd, xlutils, requests Objective: to achieve a simple http interface test, put the data into the Excel table, test by reading the data in the Excel table, and write the test results back to the Excel table 1. Data preparation 2. Interface, port, path baseurl = 1 ...

In the previous article, we talked about how to consume services through RestTemplate+Ribbon. This article mainly talks about how to consume services through Feign. 1. Introduction to FeignFeign is a declarative pseudo-Http client that makes it easier to write Http clients.With Feign, you only need to create an interface and annotate it.It has ...

Recently, redis cache has been used in our work, so we share something we have summarized. This article uses StringRedisTemplate for learning. The value here is: (1) StringRedisTemplate needs to be serialized when performing batch deletion operation, (2) the update operation is the same as the add operation, and the next code is as follows:1. ...

  1. Deep traverse DFS Similar to the first root traversal of a tree As shown in the figure, the depth traversal output of the above figure is ADCBE The adjacency matrix of a graph is given. The graph is searched for depth first, starting from vertex 0   class Graph { private: int flag[N];//State array int V ...

Concurrent programming Two methods of subprocess recycling join() allows the main process to wait for the end of the subprocess and reclaim the subprocess resources. The main process then ends and reclaims the resources from multiprocessing import Process import time def task(name): print(f'Child process{name}: starting......') time ...

Title Description: Input a positive integer array, put all the numbers in the array together to form a number, and print the smallest of all the numbers that can be spliced. For example, if the input array {3, 32321}, the minimum number that can be printed out is 321323. Solution 1: After converting int to string, arrange an ...

Title: There is a chessboard with an initial color of all white n*n. each time you select a rectangular area to reverse the color, ask how many black squares there will be at the end. N, k<=10000 Analysis: It's the same as scanning line. Record each transverse edge and project it to the x-axis. It's just that there's no d ...

The auto configuration provided by Spring Boot is very powerful. In some cases, the auto configuration function may not meet our requirements. We need to customize the configuration. At this time, we need to exclude / disable the auto configuration of some classes of Spring Boot. For example, data source and mail are all provided with automatic ...