[TOJ 3660] family relationship (Union of map maps)

describe Given the relationship between several family members, judge whether two people belong to the same family, that is, two people can directly or indirectly contact each other through these relationships. input There are multiple groups of input data. The first row of each group of data is a positive integer n (1 < = n < = 100), ...

Posted on Sat, 04 Apr 2020 18:28:57 -0400 by sidney

Passing reference in traversal of array foreach()

In the traversal of foreach ($arr as $k = > $V) in PHP, the following things happen in each round of traversal $k = currentKey($arrCopy); //Assign the key value of the current round of replica array to $k, such as subscript 0, 1, 2, etc; $v = currentVal($arrCopy); //Assign the current round value of the replica array to $v, such as' aa','b ...

Posted on Sat, 04 Apr 2020 18:20:35 -0400 by s1m0n

An example of Python Golang parsing web log regularity

Some log files need to be parsed. What python does now is to see the performance of golang. Because it's not so familiar with golang, it doesn't do any optimization. Compare the code and performance of regular extraction of the two languages. Just for reference and thinking Environmental Science macos 11.13.x 15 ...

Posted on Sat, 04 Apr 2020 18:01:07 -0400 by sam2004

[bzoj 4551--TJOI2016&HEOI2016] tree

In 2016, sister Jiayuan just learned from the tree and was very happy. Now he wants to solve such a problem: given a root tree (root is 1), there are two operations as follows: 1. Mark operation: mark a node (at the beginning, only node 1 is marked, and other nodes are not marked, and for a node, you can mark multipl ...

Posted on Sat, 04 Apr 2020 17:58:49 -0400 by alexz

Week 13 [item 4] balanced binary tree correlation algorithm

/*   *Copyright (c)2017, School of computer and control engineering, Yantai University *All rights reservrd.            *Author: Li Xinhao *Completion time: November 30, 2017 *Version number: v1.0 *Problem Description: run the algorithm mentioned in this week's video, observe the results and understand the algorith ...

Posted on Sat, 04 Apr 2020 17:16:48 -0400 by devassocx

Probe into ReadType of scan in HBase

background knowledge Linux level linux provides different functions for reading files, with the following references: When a random read-write operation is performed on the same file handle (under Windows) or file descriptor (under Linux), there are two steps to locate and read/write the file pointer, but since this is not an atomic operation, ...

Posted on Sat, 04 Apr 2020 17:10:10 -0400 by MrAlaska

Adapter mode of fabric mode

1 Overview Adapter pattern, as you can see from the name, works like an adapter: connecting two incompatible things to work together. 2 adapter mode Charger (power adapter) is a common example in daily life. The input voltage of most mobile phones is 5V, while the voltage of household AC is 220V. As the adapter, the charger converts the voltage ...

Posted on Sat, 04 Apr 2020 16:54:53 -0400 by xjake88x

json and pickle serialization

In Python, json and pickle can be serialized, but the difference is that json is public, that is, all languages can be used, but pickle can only be used inside python. They have the same methods and functions, but json can only serialize simple data types such as strings, dictionaries, lists, etc. because there are som ...

Posted on Sat, 04 Apr 2020 16:49:38 -0400 by valerie19

Spring boot connects Redis to implement HMSET operation

This article records using spring boot starter Redis to access Redis. The Redis related configuration files are placed in the application.yml file in the Resources directory, as shown below: spring: profiles: dev,default,test redis: database: 1 host: 192.168.107.253 #redis test server port: 6379 First, add dependency in pom.xml: ...

Posted on Sat, 04 Apr 2020 16:47:28 -0400 by bigwatercar

How to support arbitrary placement of sub elements of components

A filter component is as follows: The filter component contains a button and a form. The button can control the display and hiding of the form. In the design, button and form are on the same line, which is naturally encapsulated as a component when implemented. But in another project, the design is different. The button is placed in the top ri ...

Posted on Sat, 04 Apr 2020 16:33:48 -0400 by Dan39