Heap Heap is a special Tree-based data structure in which tree is a complete binary tree. Heaps are basically are binary trees with more properties and specifications and there are mainly two types of heaps. Rules A heap must be a complete binary tree. All of the levels of the tree must be completely filled except maybe the last one. The last level has all keys as left as possible Types of heap Min Heap

Tries It is commonly used to represent a dictionary for looking up words in a vocabulary Implementation https://leetcode.com/problems/implement-trie-prefix-tree/ Trie() Initializes the trie object. void insert(String word) Inserts the string word into the trie. boolean search(String word) Returns true if the string word is in the trie (i.e., was inserted before), and false otherwise. boolean startsWith(String prefix) Returns true if there is a previously inserted string word that has the prefix, and false otherwise.

Tree Properties Every tree has a special node called the root node. The root node can be used to traverse every node of the tree. It is called root because the tree originated from root only. If a tree has N nodes(vertices), the number of edges is always one less than the number of nodes (i.e., N-1). If it has more than that, it’s called a graph not a tree.

Infrastructure Setup Guide This document outlines the steps for building a deployment environment for a web service on using AWS and Terraform. Infrastructure CI/CD is also achieved through Terraform Cloud and GitHub Actions. Basic explanations about Terraform are provided. Please note that the information in this document is current as of December 17, 2021. The tools you are using, such as Terraform and Terraform Cloud, may have been updated, so

インフラ構築の手順書 Terraformを使いWebサービスのデプロイ環境を構築していく際の手順を記述する。 Terraform CloudとGithub Acti

概要 Golang についての基礎的な情報をまとめる資料である。 Go とは？ Google が開発したプログラミング言語であり、2009 年に最初のバージョンがオープンソース

The Principle of Built-in Hash Table The key value can be any hashable type. A value that belongs to a hashable type has a hash code, and this code is used to get the bucket index. Each bucket contains an array to store all the values in the same bucket initially If there are too many values in the bucket, these values will be stored in the form of height-balanced BST so that look-up can be more efficient.

CSRF(Cross Site Request Forgery) 外部サイトを経由したサーバーへの悪意のあるリクエストによって利用者の意図しない処理を実行する攻撃。 user がログインした状態で悪意あるリン

RAID 複数の Disk をまとめて一つの storage とする技術。 基本的にはデータを冗長化すること可用性を高めるためのものである。パフォーマンス向上のために用いられる

Intro Random notes of relating OOP Terminology Parameter A parameter is a named variable passed into a function. Parameter variables are used to import arguments into functions. The difference between parameters and arguments Function parameters are the names listed in the function’s definition. Function arguments are the real values passed to the function. Parameters are initialized to the values of the arguments supplied. MDN Parameter Override Overriding a method means