Tag:Children

  • Notes on Java backend development of PostgreSQL (I)

    Time:2021-9-18

    Notes on Java backend development of PostgreSQL (I) 1. Requirement 1: it is necessary to recursively query all child records under the parent record Realization thinking ①:(1) List the limited children, and then query all child records level by level(2) You need to query the corresponding child elements in batches Shortcomings: dynamic expansion cannot be […]

  • What is the difference between DOM nodes and elements? Good guy, I understand!

    Time:2021-8-22

    Author: shadeTranslator: front end XiaozhiSource: dmitripavlutin Like it and see it again, wechat search【Great Migrations 】, station B pays attention【Front end Xiaozhi】This person has no big factory background, but has an upward positive attitude. this paperGitHub https://github.com/qq44924588…It has been included in the, the articles have been classified, and a lot of my documents and tutorial […]

  • An article helps you understand the things of binary pile

    Time:2021-8-11

    [recommended reading of series articles] [sequence table of data structure] use diagrams and codes to make you understand the linear table of sequence structure [linked list of data structure] after reading this article, I finally understand the linked list [stack of data structure] understand the “stack” with detailed graphics and text (principle chapter) [queue of […]

  • After five years of front-end development, I fell into confusion

    Time:2021-8-6

    Recently, my mood has been fluctuating. I occasionally feel that I am too hypocritical and groaning without illness. My days are beautiful, but I am impetuous, uneasy, depressed and confused from time to time. But when I think about it carefully, it’s not that I’m hypocritical and groaning without illness, but that the future I’ve […]

  • In 10 hours, I shortened the running time of spark script from 15 hours to 12 minutes!

    Time:2021-7-29

    <!– In 10 hours, I shortened the running time of spark script from 15 hours to 12 minutes! — > I was confused on Monday and wrote an article:How to fetch a specific row from Spark’s dataframe, there are several solutions to my conjecture. I didn’t expect to face this problem so soon. I use […]

  • My daughter asked me about the app startup process with her phone watch

    Time:2021-7-23

    preface First, new a daughter, Var mddaught = new daughter (“6 years old”, “beautiful and lovely”, “healthy and clever”, “most like playing with little genius telephone watch and her father”) okay,My daughter has a babyOne day, my daughter asked me: “Dad, Dad, you said I played thisGenius Phone WatchWhy is it so powerful? Just click […]

  • Leetcode-0617 merge binary tree

    Time:2021-6-30

    Title addresshttps://leetcode-cn.com/problems/merge-two-binary-trees/ 1. Recursive solution For recursion, we first need the termination condition of recursion. For this problem, the termination condition of recursion is that T1 and T2 recurse to the case that either side is null, because under this condition, we don’t need to continue to merge, we can directly return the non null […]

  • TcaplusDB: wish all the world’s children and children happy children’s day.

    Time:2021-6-29

    It’s June 1 again. Mr. tcaplus DB is here to wish children all over the world a happy children’s Day! International Children’s Day is scheduled for June 1 every year. In commemoration of the leditzer massacre on June 10, 1942 and all the children who died in the war all over the world, we oppose […]

  • Happy children’s day, TcaplusDB, happy holidays, big and small friends.

    Time:2021-6-27

    It’s June 1 again. Mr. tcaplus DB is here to wish children all over the world a happy children’s Day! International Children’s Day is scheduled for June 1 every year. In commemoration of the leditzer massacre on June 10, 1942 and all the children who died in the war all over the world, we oppose […]

  • Tree and binary tree

    Time:2021-6-1

    The concept of tree Family relations of similar people definition content node The stored data elements and the branches to the subtree Degree of node Number of subtrees of nodes leaf Nodes with degree 0 Children (parents) Direct successor (direct precursor) brother Children of the same node ancestors Root to all nodes on the node […]

  • Trees and binary trees (2)

    Time:2021-5-31

    Storage structure of binary tree Sequential storage Because binary tree is more flexible, sequential representation will waste a lot of space, so it is generally not used, unless it is full binary tree or full binary tree Chain representation Static linked list It is stored in a linear structure, so the allocation of storage space […]

  • The type of Android input is date to hide the drop-down arrow

    Time:2021-5-29

    Recently, there is a requirement to have a date selector, and then the style is custom. The arrow will be hidden automatically on IOS, but Android won’t, as shown in the figure below And then a variety of online search is summarized as follows input[type=”date”]::-webkit-inner-spin-button, input[type=”date”]::-webkit-outer-spin-button, input[type=”date”]::-webkit-calendar-picker-indicator{ visibility: hidden;-webkit-appearance: none;display: none;} However, there is no […]