50 classic SQL interview questions
50 classic SQL interview questions (Part 1)
Recently, I found this set of classic SQL interview questions when collecting SQL daily questions.
I combed it again according to the questions, including table structure, relationship between tables, test data, questions, reference answers, etc. Most of the reference answers are common on various dat ...
Posted by jonybhi on Thu, 14 Apr 2022 19:57:36 +0300
Java network programming - UDP communication principle (super detailed analysis, you can understand it at a glance!!!)
preface
Continue today's Java Network Programming -- TCP and UDP communication
1, TCP and UDP overview
The transport layer usually uses TCP and UDP protocols to control the communication between endpoints
TCPUDPAgreement nameTransmission control protocolUser packet protocolConnectedConnection oriented protocol. Data must be connectedFor ...
Posted by Rangel on Thu, 14 Apr 2022 13:33:37 +0300
I'll give you a pile of tasks to complete. Can you finish all the tasks on time?
I'll give you a pile of tasks to complete. Can you finish all the tasks on time?
Tip: interview questions before Huawei 202204 It is similar to arranging meetings, waiting in line to finish washing, waiting in line to make coffee and other problems to test the skilled use of small root piles
subject
Give you an N*2 array arr, which re ...
Posted by neville on Wed, 13 Apr 2022 18:31:40 +0300
[interview] Lambda expression of new features of java8
This series is the relevant notes of the interview questions series of large factories. If there is any error, you are welcome to correct it.
Lambda expression
Why use Lambda expressions
Lambda is an anonymous function. We can understand lambda expression as a piece of code that can be passed, and pass the code like data. In this way, we c ...
Posted by leonglass on Wed, 13 Apr 2022 16:13:16 +0300
[prepare for autumn move] easily grasp the high-frequency algorithm problem of big factory -- reverse linked list
🥪 Write in front
Hello, friends 😋， I'm saury 🐟， A new blogger active in Java area and algorithm area~
Welcome to the algorithm learning community of colleges and universities 🏰: https://bbs.csdn.net/forums/Suanfa , the leaders in the community gather, and we exchange and learn from each other!
From today on, I will ...
Posted by justsomeone on Wed, 13 Apr 2022 03:23:48 +0300
Advanced skills of Android -- Summary of ContentProvider
1. Applicable scenarios
ContentProvider provides a unified interface for storing and reading dataUsing ContentProvider, applications can share dataMany of the built-in data in android are in the form of ContentProvider for developers to call (such as video, audio, pictures, address book, etc.)
There are benefits at the end of the article!!!
...
Posted by joukar on Mon, 11 Apr 2022 11:02:07 +0300
Algorithm interview problem-1-egg drop problem
Problem description
Method 1 - dynamic programming (timeout)
class Solution {
public:
int superEggDrop(int K, int N) {
const int INF=0x3f3f3f3f;
//dp[i][j]: the minimum number of experiments using j eggs when there are I stairs
vector<vector<int>>dp(N+1,vector<int>(K+1,0));
//initializa ...
Posted by newbeee on Mon, 11 Apr 2022 02:58:07 +0300
Resource scheduling, Yan restart strategy and high availability of Hadoop series (35)
restart
The resource manager is the central authority for managing resources and scheduling applications running on YARN. Therefore, it has potential single point of failure risk in the whole Apache YARN cluster. This document provides an overview of resource manager restart. This function can enhance the resource manager so that it can still ...
Posted by jandrews3 on Sun, 10 Apr 2022 22:44:21 +0300
Android advanced technology sharing -- practical part of customized View series - ViewGroup (including customized View treasure map)
Customizing the ViewGroup is actually not complicated, but it needs some effort to support the margin attribute of the child View.
I have written a custom FlowLayout to support the padding attribute of my own as well as the margin attribute of the child View. The basic comments have been written in the code in as much detail as possible.
Effe ...
Posted by bouton on Sat, 09 Apr 2022 05:24:03 +0300
Skyline, building contour problem
Catalogue of series articles
Tip: it may take some time to write a blog, but only when I stand up and write clearly can I understand it clearly. In order to force myself to learn this algorithm and filter out the ideas of problem-solving, I insist on writing! The skyline problem is the title of LeetCode: Original title link: Skyline contour p ...
Posted by rklapwijk on Wed, 06 Apr 2022 17:14:52 +0300