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java instance understands the concept of blockchain
The core of blockchain is decentralized storage. Traditional database solutions, including relational database and non relational database, belong to...
QML TEXT content up and down, left and right effect realization
1. effect Want to use QML to achieve the effect of scrolling Text, that is, "can scroll up and down one by one, when each content exceeds the le...
Problem B: a novel addition operation
Define the class newInt, including: Data member of type int. Overloaded operator '+'. The calculation rule is: add the numbers in the corre...
Spring Boot 2.x Actual StateMachine
This article was first published on a personal website: Spring Boot 2.x Actual StateMachine Spring StateMachine is a state machine framework. In the S...
PHP uses recursion to find data hierarchically
Today I'll focus on using recursion to find data hierarchically.The principle is very simple. It is mainly to find the children through the paren...
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leetcode: sum of three numbers
Train of thought: 1. Sort first (from small to large) 2. Outer loop: traverse the array, fix the number nums[i] one at a time, and then make low=i+1,...
Tensorflow output u data [output u id = = I] = input u data [input u id = = I] code analysis
import tensorflow as tf import os os.environ['CUDA_VISIBLE_DEVICES'] = '1' with tf.Graph().as_default(), tf.Session() as sess: in...
Simplify request by reflection
When you submit data for adding, you can set the name attribute of input, and then servlet uses request.getParameter("name") to receive par...
Sword finger offer - the range of motion of a robot
Problem description There is a grid of m rows and n columns on the ground, and a robot moves from the grid of coordinates (0,0), It can move left, rig...
Go is fun, 5.20 make a diagram with go / let the words dance
Today, I'd like to introduce an interesting codeThe picture is generated into a pattern of text. Have you seen the GIF of dancing sister composed...
Search in 2D array of [sword finger Offer]
Sword finger Offer question Search in 2D array -- sword finger Offer 1 Title Description In a two-dimensional array (each one-dimensional array has t...
java judge time difference month day tool class
I. Java time comparison requirements 1. From time a to time B, how many years, months and days is the difference. For example, from February 2, 2011 ...
Luogu - P1018 product maximum problem solution
Original text: https://www.luogu.org/problemnew/solution/P1018?page=7 Title: P1018 [maximum product] Preface: In theory, the positive solution of this...
What is java serialization? When is serialization required?
Serialization: the process of converting Java objects into byte streams. Deserialization: the process of converting a byte stream to a Java object. Ja...
Introduction to Kotlin 1 -- one sentence tutorial
1. Define function fun function name (parameter name: type, parameter name: type,...): return type{ ...... } such as fun sum(a: Int, b: Int): Int { r...
Release npm package step pit
Yesterday, I tried to release npm package. I ran into a problem. Please record it. First, npm account must be registered Using npm adduser command npm...
zabbix monitoring mysql survival and performance
The Zabbix environment has been deployed:Zabbix_aget: installed in / etc/zabbix1. Open port 10050 firewall-cmd --zone=public --add-port=10050/tcp --p...
Python? Restframework (frequency component)
BaseThrottle (1) take out the visitor ip (2) judge that the current ip is not in the ACCESS Dictionary, add it in, and return True directly, indicati...
python dry goods sharing in the source code Era
Simple decorator 1.1.1. The simplest decoration behavior One of the characteristics of decorator is to add content on the basis of executing original...
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I. Basic Introduction to scala
[TOC] I. overview of scala 1.1 INTRODUCTION Scala is a multi paradigm programming language. The original intention of its design is to integrate vari...
Take a look at the new feature of Java 8 -- lambda expression
What is a lambda expression? Lambda expressions can be understood as a concise way to express transitive anonymous functions: it has no name, but it ...
Initial knowledge tree and binary tree (basic knowledge explanation and common implementation)
Binary Tree Padding - Tree In the previous articles, the linear table, stack, queue, string, and so on, which we have mainly introduced, are one-to-o...
Use Preference in Androidx - to record an official document error
Use Preference the Androidx way cause Possibly because of targetApi=29, AS reminded me that some of the methods in PreferenceActivity had been abandon...
Update two written test programming questions
360 enterprise safety written test First question Finding the greatest common divisor of a series def gys(a): res_a=[] for i in range(1,a+1): if a%i=...
Programming questions - serialization and deserialization
Title Description Please implement two functions to serialize and deserialize binary tree Ideas: (1) first, we need to build a binary tree The idea o...
reverse string
We have a string, such as: DECLARE @Source VARCHAR(MAX)= 'ABCDEFGHIJKLMNOPQRSTUVWXYZ' Now I want to reverse it: ZYXWVUTSRQPONMLKJIHGFEDCBA A...
Leetcode PHP solution -- D63 917. Reverse Only Letters
D63 917. Reverse Only Letters Title Link 917. Reverse Only Letters Title Analysis Given a string containing symbols, it only reverses the occurrence o...
The View layer of the basis of Sails - Assets
The assets directory is the directory where the front-end static resources are placed under the application of Sails, such as js, css, image, etc. Dy...