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๐Ÿ“ ์•Œ๊ณ ๋ฆฌ์ฆ˜
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์•Œ๊ณ ๋ฆฌ์ฆ˜ ๊ฐœ๋… ๋ฐ ๋ฌธ์ œ ํ’€์ด ์ •๋ฆฌ





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[ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค/Python] ๊ฐ€์žฅ ํฐ ์ˆ˜๋ฌธ์ œ0 ๋˜๋Š” ์–‘์˜ ์ •์ˆ˜๊ฐ€ ์ฃผ์–ด์กŒ์„ ๋•Œ, ์ •์ˆ˜๋ฅผ ์ด์–ด ๋ถ™์—ฌ ๋งŒ๋“ค ์ˆ˜ ์žˆ๋Š” ๊ฐ€์žฅ ํฐ ์ˆ˜๋ฅผ ์•Œ์•„๋‚ด ์ฃผ์„ธ์š”.์˜ˆ๋ฅผ ๋“ค์–ด, ์ฃผ์–ด์ง„ ์ •์ˆ˜๊ฐ€ [6, 10, 2]๋ผ๋ฉด [6102, 6210, 1062, 1026, 2610, 2106]๋ฅผ ๋งŒ๋“ค ์ˆ˜ ์žˆ๊ณ , ์ด์ค‘ ๊ฐ€์žฅ ํฐ ์ˆ˜๋Š” 6210์ž…๋‹ˆ๋‹ค.0 ๋˜๋Š” ์–‘์˜ ์ •์ˆ˜๊ฐ€ ๋‹ด๊ธด ๋ฐฐ์—ด numbers๊ฐ€ ๋งค๊ฐœ๋ณ€์ˆ˜๋กœ ์ฃผ์–ด์งˆ ๋•Œ, ์ˆœ์„œ๋ฅผ ์žฌ๋ฐฐ์น˜ํ•˜์—ฌ
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a year ago
5 min read
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[ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค/Python] K๋ฒˆ์งธ ์ˆ˜https://school.programmers.co.kr/learn/courses/30/lessons/42748๋ฌธ์ œ๋ฐฐ์—ด array์˜ i๋ฒˆ์งธ ์ˆซ์ž๋ถ€ํ„ฐ j๋ฒˆ์งธ ์ˆซ์ž๊นŒ์ง€ ์ž๋ฅด๊ณ  ์ •๋ ฌํ–ˆ์„ ๋•Œ, k๋ฒˆ์งธ์— ์žˆ๋Š” ์ˆ˜๋ฅผ ๊ตฌํ•˜๋ ค ํ•ฉ๋‹ˆ๋‹ค.์˜ˆ๋ฅผ ๋“ค์–ด array๊ฐ€ [1, 5, 2, 6, 3, 7, 4], i = 2, j = 5, k = 3์ด๋ผ๋ฉดarray์˜ 2๋ฒˆ์งธ๋ถ€ํ„ฐ 5๋ฒˆ์งธ๊นŒ์ง€
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a year ago
3 min read
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[ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค/Python] ์ตœ์†Œ์ง์‚ฌ๊ฐํ˜•๋ฌธ์ œ๋ช…ํ•จ ์ง€๊ฐ‘์„ ๋งŒ๋“œ๋Š” ํšŒ์‚ฌ์—์„œ ์ง€๊ฐ‘์˜ ํฌ๊ธฐ๋ฅผ ์ •ํ•˜๋ ค๊ณ  ํ•ฉ๋‹ˆ๋‹ค. ๋‹ค์–‘ํ•œ ๋ชจ์–‘๊ณผ ํฌ๊ธฐ์˜ ๋ช…ํ•จ๋“ค์„ ๋ชจ๋‘ ์ˆ˜๋‚ฉํ•  ์ˆ˜ ์žˆ์œผ๋ฉด์„œ, ์ž‘์•„์„œ ๋“ค๊ณ  ๋‹ค๋‹ˆ๊ธฐ ํŽธํ•œ ์ง€๊ฐ‘์„ ๋งŒ๋“ค์–ด์•ผ ํ•ฉ๋‹ˆ๋‹ค. ์ด๋Ÿฌํ•œ ์š”๊ฑด์„ ๋งŒ์กฑํ•˜๋Š” ์ง€๊ฐ‘์„ ๋งŒ๋“ค๊ธฐ ์œ„ํ•ด ๋””์ž์ธํŒ€์€ ๋ชจ๋“  ๋ช…ํ•จ์˜ ๊ฐ€๋กœ ๊ธธ์ด์™€ ์„ธ๋กœ ๊ธธ์ด๋ฅผ ์กฐ์‚ฌํ–ˆ์Šต๋‹ˆ๋‹ค.์•„๋ž˜ ํ‘œ๋Š” 4๊ฐ€์ง€ ๋ช…ํ•จ์˜ ๊ฐ€๋กœ ๊ธธ์ด์™€ ์„ธ๋กœ ๊ธธ์ด๋ฅผ ๋‚˜ํƒ€๋ƒ…๋‹ˆ๋‹ค.๋ช…ํ•จ ๋ฒˆํ˜ธ๊ฐ€๋กœ ๊ธธ์ด์„ธ๋กœ
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a year ago
8 min read
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[ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค/Python] ์˜ฌ๋ฐ”๋ฅธ ๊ด„ํ˜ธhttps://school.programmers.co.kr/learn/courses/30/lessons/12909๋ฌธ์ œ๊ด„ํ˜ธ๊ฐ€ ๋ฐ”๋ฅด๊ฒŒ ์ง์ง€์–ด์กŒ๋‹ค๋Š” ๊ฒƒ์€ '(' ๋ฌธ์ž๋กœ ์—ด๋ ธ์œผ๋ฉด ๋ฐ˜๋“œ์‹œ ์ง์ง€์–ด์„œ ')' ๋ฌธ์ž๋กœ ๋‹ซํ˜€์•ผ ํ•œ๋‹ค๋Š” ๋œป์ž…๋‹ˆ๋‹ค. ์˜ˆ๋ฅผ ๋“ค์–ด"()()" ๋˜๋Š” "(())()" ๋Š” ์˜ฌ๋ฐ”๋ฅธ ๊ด„ํ˜ธ์ž…๋‹ˆ๋‹ค.")()(" ๋˜๋Š” "(()(" ๋Š” ์˜ฌ๋ฐ”๋ฅด์ง€ ์•Š์€ ๊ด„ํ˜ธ์ž…๋‹ˆ๋‹ค.'('
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0
a year ago
3 min read
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[ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค/Python] ๋‹จ์–ด ๋ณ€ํ™˜https://school.programmers.co.kr/learn/courses/30/lessons/43163๋ฌธ์ œ๋‘ ๊ฐœ์˜ ๋‹จ์–ด begin, target๊ณผ ๋‹จ์–ด์˜ ์ง‘ํ•ฉ words๊ฐ€ ์žˆ์Šต๋‹ˆ๋‹ค. ์•„๋ž˜์™€ ๊ฐ™์€ ๊ทœ์น™์„ ์ด์šฉํ•˜์—ฌ begin์—์„œ target์œผ๋กœ ๋ณ€ํ™˜ํ•˜๋Š” ๊ฐ€์žฅ ์งง์€ ๋ณ€ํ™˜ ๊ณผ์ •์„ ์ฐพ์œผ๋ ค๊ณ  ํ•ฉ๋‹ˆ๋‹ค.1. ํ•œ ๋ฒˆ์— ํ•œ ๊ฐœ์˜ ์•ŒํŒŒ๋ฒณ๋งŒ ๋ฐ”๊ฟ€ ์ˆ˜ ์žˆ์Šต๋‹ˆ๋‹ค. 2.
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a year ago
3 min read
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[์•Œ๊ณ ๋ฆฌ์ฆ˜/Python] ์ด๋ถ„ํƒ์ƒ‰์ด๋ถ„ํƒ์ƒ‰ Binary Searchํƒ์ƒ‰ ๋ฒ”์œ„๋ฅผ ๋‘ ๋ถ€๋ถ„์œผ๋กœ ๋ถ„ํ• ํ•˜๋ฉด์„œ ์ฐพ๋Š” ๋ฐฉ์‹ํƒ์ƒ‰์€ ์˜ค๋ฆ„์ฐจ์ˆœ ์ •๋ ฌ๋œ ์ƒํƒœ๋กœ ํ•ด์•ผ ํ•œ๋‹ค.์‹œ๊ฐ„๋ณต์žก๋„์ „์ฒด ํƒ์ƒ‰ : O(N)์ด๋ถ„ ํƒ์ƒ‰ : O(logN)์ž‘๋™ ๋ฐฉ์‹๋ฐ์ดํ„ฐ ์ •๋ ฌ๋ฐ์ดํ„ฐ์˜ ์ค‘๊ฐ„๊ฐ’(mid)์ด ์ฐพ๊ณ ์ž ํ•˜๋Š” ๊ฐ’(target)์ธ์ง€ ๋น„๊ตmid ๊ฐ’์ด target ๊ฐ’๊ณผ ๋‹ค๋ฅด๋ฉด ๋Œ€์†Œ๊ด€๊ณ„๋ฅผ ๋น„๊ตํ•˜์—ฌ ํƒ์ƒ‰ ๋ฒ”์œ„๋ฅผ ์ขํžˆ๊ณ , target๊ณผ mid
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a year ago
2 min read
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[์•Œ๊ณ ๋ฆฌ์ฆ˜/Python] ๋™์ ๊ณ„ํš๋ฒ• DP๋™์  ๊ณ„ํš๋ฒ• Dynamic Programming๋ณต์žกํ•œ ๋ฌธ์ œ๋ฅผ ๊ฐ„๋‹จํ•œ ์—ฌ๋Ÿฌ ๊ฐœ์˜ ๋ฌธ์ œ๋กœ ๋‚˜๋ˆ„์–ด ํ‘ธ๋Š” ๋ฐฉ๋ฒ•ํ•œ ๊ฐ€์ง€ ๋ฌธ์ œ์— ๋Œ€ํ•ด์„œ ํ•œ ๋ฒˆ๋งŒ ํ’€๋„๋ก ๋งŒ๋“ค์–ด์ฃผ๋Š” ์•Œ๊ณ ๋ฆฌ์ฆ˜๋˜‘๊ฐ™์€ ์—ฐ์‚ฐ์„ ๋ฐ˜๋ณตํ•˜์ง€ ์•Š๋„๋ก ํ•œ๋‹ค.๋ฉ”๋ชจ์ด์ œ์ด์…˜(Memoization) : ํ•œ ๋ฒˆ ๊ณ„์‚ฐํ•œ ๋ฌธ์ œ๋Š” ๋‹ค์‹œ ๊ณ„์‚ฐํ•˜์ง€ ์•Š๋„๋ก ์ €์žฅํ•ด๋‘๊ณ  ํ™œ์šฉํ•˜๋Š” ๋ฐฉ์‹์‚ฌ์šฉ ์กฐ๊ฑด์ตœ์  ๋ถ€๋ถ„ ๊ตฌ์กฐ (Optimal Substruct
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0
a year ago
3 min read
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[ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค/Python] ๋„คํŠธ์›Œํฌ๋ฌธ์ œ๋„คํŠธ์›Œํฌ๋ž€ ์ปดํ“จํ„ฐ ์ƒํ˜ธ ๊ฐ„์— ์ •๋ณด๋ฅผ ๊ตํ™˜ํ•  ์ˆ˜ ์žˆ๋„๋ก ์—ฐ๊ฒฐ๋œ ํ˜•ํƒœ๋ฅผ ์˜๋ฏธํ•ฉ๋‹ˆ๋‹ค. ์˜ˆ๋ฅผ ๋“ค์–ด, ์ปดํ“จํ„ฐ A์™€ ์ปดํ“จํ„ฐ B๊ฐ€ ์ง์ ‘์ ์œผ๋กœ ์—ฐ๊ฒฐ๋˜์–ด์žˆ๊ณ , ์ปดํ“จํ„ฐ B์™€ ์ปดํ“จํ„ฐ C๊ฐ€ ์ง์ ‘์ ์œผ๋กœ ์—ฐ๊ฒฐ๋˜์–ด ์žˆ์„ ๋•Œ ์ปดํ“จํ„ฐ A์™€ ์ปดํ“จํ„ฐ C๋„ ๊ฐ„์ ‘์ ์œผ๋กœ ์—ฐ๊ฒฐ๋˜์–ด ์ •๋ณด๋ฅผ ๊ตํ™˜ํ•  ์ˆ˜ ์žˆ์Šต๋‹ˆ๋‹ค. ๋”ฐ๋ผ์„œ ์ปดํ“จํ„ฐ A, B, C๋Š” ๋ชจ๋‘ ๊ฐ™์€ ๋„คํŠธ์›Œํฌ ์ƒ์— ์žˆ๋‹ค๊ณ  ํ•  ์ˆ˜ ์žˆ์Šต๋‹ˆ๋‹ค.์ปดํ“จํ„ฐ
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0
a year ago
3 min read
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[์•Œ๊ณ ๋ฆฌ์ฆ˜/Python] BFS & DFS์ธ์ ‘ ํ–‰๋ ฌ (Adjacency Matrix)2์ฐจ์› ๋ฐฐ์—ด๋กœ ๊ทธ๋ž˜ํ”„์˜ ์—ฐ๊ฒฐ ๊ด€๊ณ„๋ฅผ ํ‘œํ˜„ํ•˜๋Š” ๋ฐฉ์‹ํƒ์ƒ‰ํ•  ๋•Œ๋ชจ๋“  ๋…ธ๋“œ๋ฅผ ํ™•์ธํ•ด์•ผ ํ•˜๋ฏ€๋กœ ์‹œ๊ฐ„๋ณต์žก๋„๋Š” O(N^2)์ด๋‹ค.ํ–‰๋ ฌ ์ธ๋ฑ์Šค๋ฅผ ์ด์šฉํ•ด ๋น ๋ฅด๊ฒŒ ์ ‘๊ทผ ๊ฐ€๋Šฅํ•˜๋ฏ€๋กœ, graphi ์กฐํšŒ๋Š” O(1)์ด๋‹ค.๋…ธ๋“œ ๊ฐœ์ˆ˜๊ฐ€ ์ ๊ณ  ๊ฐ„์„ ์ด ๋งŽ์„ ๋•Œ ํ™œ์šฉ(0) --- (1) \ \ (2)graph = [
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0
a year ago
6 min read
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[๋ฐฑ์ค€/Python] 1138๋ฒˆ: ํ•œ ์ค„๋กœ ์„œ๊ธฐ[1138๋ฒˆ] ํ•œ ์ค„๋กœ ์„œ๊ธฐ๋ฌธ์ œN๋ช…์˜ ์‚ฌ๋žŒ๋“ค์€ ๋งค์ผ ์•„์นจ ํ•œ ์ค„๋กœ ์„ ๋‹ค. ์ด ์‚ฌ๋žŒ๋“ค์€ ์ž๋ฆฌ๋ฅผ ๋งˆ์Œ๋Œ€๋กœ ์„œ์ง€ ๋ชปํ•˜๊ณ  ์˜ค๋ฏผ์‹์˜ ์ง€์‹œ๋Œ€๋กœ ์„ ๋‹ค.์–ด๋А ๋‚  ์‚ฌ๋žŒ๋“ค์€ ์˜ค๋ฏผ์‹์ด ์‚ฌ๋žŒ๋“ค์ด ์ค„ ์„œ๋Š” ์œ„์น˜๋ฅผ ๊ธฐ๋กํ•ด ๋†“๋Š”๋‹ค๋Š” ๊ฒƒ์„ ์•Œ์•˜๋‹ค. ๊ทธ๋ฆฌ๊ณ  ์•„์นจ์— ์ž๊ธฐ๊ฐ€ ๊ธฐ๋กํ•ด ๋†“์€ ๊ฒƒ๊ณผ ์‚ฌ๋žŒ๋“ค์ด ์ค„์„ ์„  ์œ„์น˜๊ฐ€ ๋งž๋Š”์ง€ ํ™•์ธํ•œ๋‹ค.์‚ฌ๋žŒ๋“ค์€ ์ž๊ธฐ๋ณด๋‹ค ํฐ ์‚ฌ๋žŒ์ด ์™ผ์ชฝ์— ๋ช‡ ๋ช… ์žˆ์—ˆ๋Š”์ง€๋งŒ์„ ๊ธฐ
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0
a year ago
5 min read
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[๋ฐฑ์ค€/Python] 1026๋ฒˆ: ๋ณด๋ฌผ[1026๋ฒˆ] ๋ณด๋ฌผ๋ฌธ์ œ์˜›๋‚  ์˜›์ ์— ์ˆ˜ํ•™์ด ํ•ญ์ƒ ํฐ ๊ณจ์นซ๊ฑฐ๋ฆฌ์˜€๋˜ ๋‚˜๋ผ๊ฐ€ ์žˆ์—ˆ๋‹ค. ์ด ๋‚˜๋ผ์˜ ๊ตญ์™• ๊น€์ง€๋ฏผ์€ ๋‹ค์Œ๊ณผ ๊ฐ™์€ ๋ฌธ์ œ๋ฅผ ๋‚ด๊ณ  ํฐ ์ƒ๊ธˆ์„ ๊ฑธ์—ˆ๋‹ค.๊ธธ์ด๊ฐ€ N์ธ ์ •์ˆ˜ ๋ฐฐ์—ด A์™€ B๊ฐ€ ์žˆ๋‹ค. ๋‹ค์Œ๊ณผ ๊ฐ™์ด ํ•จ์ˆ˜ S๋ฅผ ์ •์˜ํ•˜์ž.S = A[0] ร— B[0] + ... + A[N-1] ร— B[N-1]S์˜ ๊ฐ’์„ ๊ฐ€์žฅ ์ž‘๊ฒŒ ๋งŒ๋“ค๊ธฐ ์œ„ํ•ด A์˜ ์ˆ˜๋ฅผ ์žฌ๋ฐฐ์—ดํ•˜์ž. ๋‹จ, B์—
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0
a year ago
4 min read
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[๋ฐฑ์ค€/Python] 11399๋ฒˆ: ATM[11399๋ฒˆ] ATM๋ฌธ์ œ์ธํ•˜์€ํ–‰์—๋Š” ATM์ด 1๋Œ€๋ฐ–์— ์—†๋‹ค. ์ง€๊ธˆ ์ด ATM์•ž์— N๋ช…์˜ ์‚ฌ๋žŒ๋“ค์ด ์ค„์„ ์„œ์žˆ๋‹ค. ์‚ฌ๋žŒ์€ 1๋ฒˆ๋ถ€ํ„ฐ N๋ฒˆ๊นŒ์ง€ ๋ฒˆํ˜ธ๊ฐ€ ๋งค๊ฒจ์ ธ ์žˆ์œผ๋ฉฐ, i๋ฒˆ ์‚ฌ๋žŒ์ด ๋ˆ์„ ์ธ์ถœํ•˜๋Š”๋ฐ ๊ฑธ๋ฆฌ๋Š” ์‹œ๊ฐ„์€ Pi๋ถ„์ด๋‹ค.์‚ฌ๋žŒ๋“ค์ด ์ค„์„ ์„œ๋Š” ์ˆœ์„œ์— ๋”ฐ๋ผ์„œ, ๋ˆ์„ ์ธ์ถœํ•˜๋Š”๋ฐ ํ•„์š”ํ•œ ์‹œ๊ฐ„์˜ ํ•ฉ์ด ๋‹ฌ๋ผ์ง€๊ฒŒ ๋œ๋‹ค. ์˜ˆ๋ฅผ ๋“ค์–ด, ์ด 5๋ช…์ด ์žˆ๊ณ , P1 = 3, P2 = 1
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0
a year ago
5 min read
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[๋ฐฑ์ค€/Python] 2839๋ฒˆ: ์„คํƒ• ๋ฐฐ๋‹ฌ[2839๋ฒˆ] ์„คํƒ• ๋ฐฐ๋‹ฌ๋ฌธ์ œ์ƒ๊ทผ์ด๋Š” ์š”์ฆ˜ ์„คํƒ•๊ณต์žฅ์—์„œ ์„คํƒ•์„ ๋ฐฐ๋‹ฌํ•˜๊ณ  ์žˆ๋‹ค. ์ƒ๊ทผ์ด๋Š” ์ง€๊ธˆ ์‚ฌํƒ•๊ฐ€๊ฒŒ์— ์„คํƒ•์„ ์ •ํ™•ํ•˜๊ฒŒ Nํ‚ฌ๋กœ๊ทธ๋žจ์„ ๋ฐฐ๋‹ฌํ•ด์•ผ ํ•œ๋‹ค. ์„คํƒ•๊ณต์žฅ์—์„œ ๋งŒ๋“œ๋Š” ์„คํƒ•์€ ๋ด‰์ง€์— ๋‹ด๊ฒจ์ ธ ์žˆ๋‹ค. ๋ด‰์ง€๋Š” 3ํ‚ฌ๋กœ๊ทธ๋žจ ๋ด‰์ง€์™€ 5ํ‚ฌ๋กœ๊ทธ๋žจ ๋ด‰์ง€๊ฐ€ ์žˆ๋‹ค.์ƒ๊ทผ์ด๋Š” ๊ท€์ฐฎ๊ธฐ ๋•Œ๋ฌธ์—, ์ตœ๋Œ€ํ•œ ์ ์€ ๋ด‰์ง€๋ฅผ ๋“ค๊ณ  ๊ฐ€๋ ค๊ณ  ํ•œ๋‹ค. ์˜ˆ๋ฅผ ๋“ค์–ด, 18ํ‚ฌ๋กœ๊ทธ๋žจ ์„คํƒ•์„ ๋ฐฐ๋‹ฌํ•ด์•ผ ํ•  ๋•Œ,
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[์•Œ๊ณ ๋ฆฌ์ฆ˜/Python] ๊ทธ๋ฆฌ๋”” ์•Œ๊ณ ๋ฆฌ์ฆ˜ (Greedy Algorithm)1. ๊ทธ๋ฆฌ๋”” (Greedy) ์•Œ๊ณ ๋ฆฌ์ฆ˜ํƒ์š•๋ฒ•(Greedy)์€ ํ˜„์žฌ ์ƒํ™ฉ์—์„œ ๊ฐ€์žฅ ์ข‹์€ ๊ฒƒ๋งŒ ๊ณ ๋ฅด๋Š” ๋ฐฉ๋ฒ•์„ ์˜๋ฏธํ•œ๋‹ค.๊ทธ๋ฆฌ๋”” ์•Œ๊ณ ๋ฆฌ์ฆ˜์„ ์ด์šฉํ•˜๋ฉด ๋งค ์ˆœ๊ฐ„ ๊ฐ€์žฅ ์ข‹์•„๋ณด์ด๋Š” ๊ฒƒ์„ ์„ ํƒํ•˜๋ฉฐ, ํ˜„์žฌ์˜ ์„ ํƒ์ด ๋‚˜์ค‘์— ๋ฏธ์น  ์˜ํ–ฅ์— ๋Œ€ํ•ด์„œ๋Š” ๊ณ ๋ คํ•˜์ง€ ์•Š๋Š”๋‹ค.๊ทธ๋ฆฌ๋”” ์•Œ๊ณ ๋ฆฌ์ฆ˜์˜ ํŠน์ง•์€ '์‚ฌ์ „์— ์™ธ์šฐ๊ณ  ์žˆ์ง€ ์•Š์•„๋„ ํ’€ ์ˆ˜ ์žˆ์„ ๊ฐ€๋Šฅ์„ฑ์ด ๋†’์€ ๋ฌธ์ œ ์œ ํ˜•'์ด๋‹ค. ์ฆ‰, ๋‹ค๋ฅธ ์•Œ๊ณ ๋ฆฌ์ฆ˜์˜
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์•„์ง ๋Œ“๊ธ€์ด ์—†์–ด์š”