terryEHLee

terryEHLee

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terryEHLee

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๐Ÿ–ฅ๏ธ CS(Computer Science)(26)

  • [CS/์•Œ๊ณ ๋ฆฌ์ฆ˜] ์‹œ๊ฐ„/๊ณต๊ฐ„ ๋ณต์žก๋„

    ์‹œ๊ฐ„๋ณต์žก๋„(Time Complexity) : ์•Œ๊ณ ๋ฆฌ์ฆ˜์ด ๋ฌธ์ œ๋ฅผ ํ•ด๊ฒฐํ•˜๋Š”๋ฐ ๊ฑธ๋ฆฌ๋Š” ์‹œ๊ฐ„์„ ๋ถ„์„ํ•˜๋Š” ๋ฐฉ๋ฒ•์œผ๋กœ ์•Œ๊ณ ๋ฆฌ์ฆ˜์˜ ์„ฑ๋Šฅ์„ ํ‰๊ฐ€ํ•˜๋Š”๋ฐ ์‚ฌ์šฉ๋œ๋‹ค. Big O ํ‘œ๊ธฐ๋ฒ•์œผ๋กœ ๋‚˜ํƒ€๋‚ด๋ฉฐ, ์•Œ๊ณ ๋ฆฌ์ฆ˜์ด ์ž…๋ ฅ ํฌ๊ธฐ n์— ๋Œ€ํ•ด ์–ด๋–ป๊ฒŒ ์ฆ๊ฐ€ํ•˜๋Š”์ง€๋ฅผ ํ‘œํ˜„ํ•œ๋‹ค. ex) O(1), O(n), O(logn) .... ๊ณต๊ฐ„๋ณต์žก๋„(Space Complexity) : ์•Œ๊ณ ๋ฆฌ์ฆ˜์ด ์ž…๋ ฅ ๋ฐ์ดํ„ฐ๋ฅผ ์ฒ˜๋ฆฌํ•˜๊ฑฐ๋‚˜ ์ค‘๊ฐ„ ๊ฒฐ๊ณผ๋ฅผ ์ €์žฅํ•˜๋Š”๋ฐ ํ•„์š”ํ•œ ๋ฉ”๋ชจ๋ฆฌ์˜ ์–‘์„ ํ‰๊ฐ€ํ•˜๋Š”๋ฐ ์‚ฌ์šฉ๋œ๋‹ค. Byte, Bit ๋‹จ์œ„, Big O ํ‘œ๊ธฐ๋ฒ•์œผ๋กœ ๋‚˜ํƒ€๋ƒ„. ๊ณต๊ฐ„ ๋ณต์žก๋„์— ์˜ํ–ฅ์„ ๋ฏธ์น˜๋Š” ์š”์†Œ๋“ค ๋ณ€์ˆ˜ ๋ฐ ๋ฐ์ดํ„ฐ ๊ตฌ์กฐ: ๋ณ€์ˆ˜ ๊ฐœ์ˆ˜ ๋ฐ ํฌ๊ธฐ, ์ž๋ฃŒ๊ตฌ์กฐ ์žฌ๊ท€ ํ˜ธ์ถœ: ์žฌ๊ท€์  ์•Œ๊ณ ๋ฆฌ์ฆ˜์€ stack์— ์ •๋ณด๋ฅผ ์ €์žฅํ•ด์•ผํ•˜๊ธฐ์— ๊ณต๊ฐ„๋ณต์žก๋„๊ฐ€ ๋†’์•„์ง ์ž„์‹œ ๋ฒ„ํผ ์ผ๋ฐ˜์ ์œผ๋กœ ์‹œ๊ฐ„๋ณต์žก๋„์™€ ๊ณต๊ฐ„๋ณต์žก๋„..

    2023.07.27
  • [CS/๋„คํŠธ์›Œํฌ] ํ†ต์‹ (์„œ๋ฒ„<->ํด๋ผ์ด์–ธํŠธ)

    ์„œ๋ฒ„ -> ํด๋ผ์ด์–ธํŠธ ์œ ์ €๊ฐ€ ์›น์‚ฌ์ดํŠธ ํ˜น์€ ์•ฑ์— ์ ‘์†์„ ํ•˜๋ฉด ์„œ๋ฒ„๊ฐ€ ํด๋ผ์ด์–ธํŠธ์— data๋ฅผ ๋ณด์—ฌ์คŒ. ํด๋ผ์ด์–ธํŠธ ๊ฐœ๋ฐœ์ž๋Š” ์ด data๋ฅผ API(Application programming Interface)๋กœ ๋ฐ›์•„์˜ด. ์ด API๋Š” JSON(JavaScript Object Notation)์ด๋ผ๋Š” ํ˜•ํƒœ๋กœ ์ฃผ๊ณ  ๋ฐ›์•„์ง. JSON Dictionary ํ˜•ํƒœ์™€ ์œ ์‚ฌํ•œ Key:Value ์Œ์œผ๋กœ ์ด๋ฃจ์–ด์ง ํด๋ผ์ด์–ธํŠธ -> ์„œ๋ฒ„ GET : ํ†ต์ƒ์ ์œผ๋กœ ์ •์ ์ธ DATA๋ฅผ ์š”์ฒญํ•  ๋•Œ ์‚ฌ์šฉ(Read) ex) ๋‚ ์”จ, ์Šคํฌ์ธ ๊ฒฝ๊ธฐ ๊ฒฐ๊ณผ ๋“ฑ์˜ ์ •๋ณด ์กฐํšŒ ๐Ÿงธ GET ๋ฐฉ์‹์˜ ๋ฐ์ดํ„ฐ ์˜ˆ์‹œ https://movie.naver.com/movie/bi/mi/basic.nhn?code=161967 -> '?'๋ฅผ ๊ธฐ์ค€์œผ๋กœ ์•ž ๋ถ€๋ถ„์ด '์„œ๋ฒ„์ฃผ์†Œ' ๋’ท ๋ถ€๋ถ„..

    2023.04.22
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