Programmer Group

Title link: Lizard Title Analysis: With a network stream, let's first analyze the problem: In a \(r*c\) diagram, some numbers are distributed, and others are filled with \(0\). We start from the specified numbers and can move to a number within \(d\) or outside the diagram each time. The original number will be \(-1\) and can't be negative at a ...

biconnected component (bcc) Concept: There are two kinds of bi-connected components, one is bi-connected component and the other is edge bi-connected component. If the removal of any node (an edge) in an undirected graph does not change the connectivity of the graph, that is, there is no cut point (bridge), it is called a point (edge) connect ...

shell script Learning Guide 2017-03-26 Turn on tracing set -x Turn off tracing set +x This abbreviation is also too bullish i18n: internationalization l10n: localization Regular expression (absolutely something you don't need to forget) Backward Reference awk (again) sed, stream editor sed -n '/Character string/p' file.txt sed -i '/Character ...

Algorithmic Training Tricky and Clever Password Time limit: 2.0s memory limit: 256.0MB Problem Description When we were young, the hero in our story, King Copa, had his personal data not completely hidden.This is unacceptable to him.As a result, he developed a password that was ...

serialize Serialization: Serialize, which writes Java objects to IO streams (which can be stored in databases, files, etc.) Deserialize, which reads and restores Java objects from an IO stream. So to understand: serialization is to seal the object, and deserialization is to unblock. Objects contain not only characters, but more non-characters, ...

If this is not good, you can see the Public Number Series: RxJava 2.0 Tutorial (1) http://mp.weixin.qq.com/s/Nr9kxDR2hRWvfqHUdDF-XA RxJava 2.0 tutorial (2) https://mp.weixin.qq.com/s/S-sSWOcd408BtIC7Z7yN8g RxJava 2.0 Tutorial (3) http://mp.weixin.qq.com/s/5QjSX0OOtWBhjx5oR9DnBg  RxJava 2.0 tutorial (4) https://mp.w ...

lambda functions are anonymous functions. Before ES6 was released, we usually wrote anonymous functions like this. var selected = allJobs.filter(function (job) { return job.isSelected(); }); ES6 introduces a new grammar for writing functions var selected = allJobs.filter(job => job.isSelected()); Its syntax is very simple: i ...

(1) Importance of asynchronous programming With asynchronous programming, method calls run in the background (usually with the help of threads or tasks) and do not block the calling thread. There are three different asynchronous programming modes: asynchronous mode, Event-based Asynchronous Mode and newly added task-based asynchronous mode (TAP ...

Preface Hashtable in JDK is a K-V container of thread-safe. Its principle of thread-safe is very simple. It adds synchronized keyword to all methods involved in the operation of the hash table for locking operation. This achieves thread safety, but is very inefficient. //With synchronized acquisition of hashmap locks every time a method enters, ...

Router, or routing, is an important concept in the front end. In order to achieve decoupling, specific addresses and corresponding pages are separated by router. Create a new detail folder in the src/app directory and create a file named gundam-detail.component. import { Component } from '@angular/core'; import { Gundam } from '../../mo ...