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https://stackoverflow.com/questions/12362422/do-the-columns-in-a-table-in-a-rmdb-have-order Do the "columns" in a table in a RMDB have order? I learned that there is no concept of order in terms of tuples (e.g. rows) in a table but according to wikipedia "a tuple is an ordered list of elements". Does that mean that attributes do have an ... stackoverflow.com

정리 할 링크 https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String String The String object is used to represent and manipulate a sequence of characters. developer.mozilla.org https://developer.mozilla.org/ko/docs/Web/JavaScript/Reference/Global_Objects/Object/valueOf Object.prototype.valueOf() valueOf() 메서드는 특정 객체의 원시 값을 반환합니다. developer.mozilla.org https://develope..

1. 문제 https://www.acmicpc.net/problem/1208 2. Note 2.1. Subset sum problem Subset sum 문제라고 생각하여 O(nS)으로 해결하려 했습니다. 그러나 원소가 음수도 될 수 있다는 걸 간과하여 런타임 에러가 발생하였고, 이를 해결하기 위해 배열의 인덱스를 보정하여 접근하는 방식을 구현했지만 메모리 초과를 받았습니다. 2.2. 분할 정복의 아이디어 한 시간 넘게 해결하지 못하여 해법을 검색해봤는데 DP가 아닌 분할 정복으로 해결할 수 있다는 사실을 알게 되었습니다.

Project: A Pixel Art Editor The material from the previous chapters gives you all the elements you need to build a basic web application. In this chapter, we will do just that. Components We will structure the editor interface as a number of components, objects that are responsible for a piece of the DOM and that may contain other components inside them. 에디터 인터페이스는 여러 개의 컴포넌트로 이루어 지는데, 이 컴포넌트는 하..

Node.js Node.js, a program that allows you to apply your JavaScript skills outside of the browser. With it, you can build anything from small command line tools to HTTP servers that power dynamic websites. These chapters aim to teach you the main concepts that Node.js uses and to give you enough information to write useful programs for it. Background One of the more difficult problems with writi..

HTTP and Forms The protocol the browser might send something like this: GET /18_http.html HTTP/1.1 Host: eloquentjavascript.net User-Agent: Your browser's name Then the server responds, through that same connection. HTTP/1.1 200 OK Content-Length: 65585 Content-Type: text/html Last-Modified: Mon, 08 Jan 2018 10:29:45 GMT ... the rest of the document The browser takes the part of the response aft..

Drawing on Canvas Browsers give us several ways to display graphics. The simplest way is to use styles to position and color regular DOM elements. But we’d be using the DOM for something that it wasn’t originally designed for. There are two alternatives. The first is DOM-based but utilizes Scalable Vector Graphics (SVG), rather than HTML. Think of SVG as a document-markup dialect that focuses on..

Code HTML CSS .background { background: rgb(52, 166, 251); table-layout: fixed; border-spacing: 0; } .background td { padding: 0; } .lava { background: rgb(255, 100, 100); } .wall { background: white; } .actor { position: absolute; } .coin { background: rgb(241, 229, 89); } .player { background: rgb(64, 64, 64); } .lost .player { background: rgb(160, 64, 64); } .won .player { box-shadow: -4px -7..

Handling Events Some programs work with direct user input, such as mouse and keyboard actions. That kind of input isn’t available as a well-organized data structure—it comes in piece by piece, in real time, and the program is expected to respond to it as it happens. 마우스나 키보드의 액션같은 유저 입력은 실시간으로 조각조각 들어오고 바로 처리되길 기대한다. Event handlers Imagine an interface where the only way to find out whether a ke..

The Document Object Model When you open a web page in your browser, the browser retrieves the page’s HTML text and parses it, much like the way our parser from Chapter 12 parsed programs. The browser builds up a model of the document’s structure and uses this model to draw the page on the screen. This representation of the document is one of the toys that a JavaScript program has available in it..