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[ys-han00] WEEK 09 solutions#2259

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TonyKim9401 merged 1 commit intoDaleStudy:mainDaleStudy/leetcode-study:mainfrom
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Jan 10, 2026
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[ys-han00] WEEK 09 solutions#2259
TonyKim9401 merged 1 commit intoDaleStudy:mainDaleStudy/leetcode-study:mainfrom
ys-han00:mainys-han00/leetcode-study:mainCopy head branch name to clipboard

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@ys-han00 ys-han00 commented Jan 8, 2026

๋‹ต์•ˆ ์ œ์ถœ ๋ฌธ์ œ

์ž‘์„ฑ์ž ์ฒดํฌ ๋ฆฌ์ŠคํŠธ

  • Projects์˜ ์˜ค๋ฅธ์ชฝ ๋ฒ„ํŠผ(โ–ผ)์„ ๋ˆŒ๋Ÿฌ ํ™•์žฅํ•œ ๋’ค, Week๋ฅผ ํ˜„์žฌ ์ฃผ์ฐจ๋กœ ์„ค์ •ํ•ด์ฃผ์„ธ์š”.
  • ๋ฌธ์ œ๋ฅผ ๋ชจ๋‘ ํ‘ธ์‹œ๋ฉด ํ”„๋กœ์ ํŠธ์—์„œ Status๋ฅผ In Review๋กœ ์„ค์ •ํ•ด์ฃผ์„ธ์š”.
  • ์ฝ”๋“œ ๊ฒ€ํ† ์ž 1๋ถ„ ์ด์ƒ์œผ๋กœ๋ถ€ํ„ฐ ์Šน์ธ์„ ๋ฐ›์œผ์…จ๋‹ค๋ฉด PR์„ ๋ณ‘ํ•ฉํ•ด์ฃผ์„ธ์š”.

๊ฒ€ํ† ์ž ์ฒดํฌ ๋ฆฌ์ŠคํŠธ

Important

๋ณธ์ธ ๋‹ต์•ˆ ์ œ์ถœ ๋ฟ๋งŒ ์•„๋‹ˆ๋ผ ๋‹ค๋ฅธ ๋ถ„ PR ํ•˜๋‚˜ ์ด์ƒ์„ ๋ฐ˜๋“œ์‹œ ๊ฒ€ํ† ๋ฅผ ํ•ด์ฃผ์…”์•ผ ํ•ฉ๋‹ˆ๋‹ค!

  • ๋ฐ”๋กœ ์ด์ „์— ์˜ฌ๋ผ์˜จ PR์— ๋ณธ์ธ์„ ์ฝ”๋“œ ๋ฆฌ๋ทฐ์–ด๋กœ ์ถ”๊ฐ€ํ•ด์ฃผ์„ธ์š”.
  • ๋ณธ์ธ์ด ๊ฒ€ํ† ํ•ด์•ผํ•˜๋Š” PR์˜ ๋‹ต์•ˆ ์ฝ”๋“œ์— ํ”ผ๋“œ๋ฐฑ์„ ์ฃผ์„ธ์š”.
  • ํ† ์š”์ผ ์ „๊นŒ์ง€ PR์„ ๋ณ‘ํ•ฉํ•  ์ˆ˜ ์žˆ๋„๋ก ์Šน์ธํ•ด์ฃผ์„ธ์š”.

@TonyKim9401
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@DaleStudy ๋ฆฌ๋ทฐํ•ด์ค˜

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dalestudy bot commented Jan 10, 2026

๋จผ์ €, ๋‹ค์–‘ํ•œ ๋ฌธ์ œ์— ๋„์ „ํ•˜๋ฉฐ ๊น”๋”ํ•œ ์†”๋ฃจ์…˜์„ ์ œ์ถœํ•˜์‹  ๊ฒƒ์— ๊ฒฉ๋ ค๋ฅผ ๋“œ๋ฆฝ๋‹ˆ๋‹ค! ํŠนํžˆ ํˆฌ ํฌ์ธํ„ฐ, BFS/DFS, ๋น„ํŠธ ์—ฐ์‚ฐ ๋“ฑ ์—ฌ๋Ÿฌ ๊ธฐ๋ฒ•์„ ์ž˜ ํ™œ์šฉํ•˜์…จ๋„ค์š”.

๋ช‡ ๊ฐ€์ง€ ๊ฐœ์„  ๋ฐ ํ”ผ๋“œ๋ฐฑ์„ ๋“œ๋ฆฌ์ž๋ฉด:

  1. ์‹œ๊ฐ„/๊ณต๊ฐ„ ๋ณต์žก๋„ ํ‘œ๊ธฐ: ๊ฐ ์†”๋ฃจ์…˜์— TC์™€ SC๋ฅผ ๋ช…์‹œํ•˜๋Š” ๊ฒƒ์ด ์ข‹๊ฒ ์Šต๋‹ˆ๋‹ค. ์˜ˆ๋ฅผ ๋“ค์–ด, hasCycle์€ TC: O(n), SC: O(1), maxProduct๋Š” TC: O(n), SC: O(1) ๋“ฑ์œผ๋กœ์š”. ์ด๋Š” ๋ฆฌ๋ทฐ์–ด์™€ ๋ณธ์ธ ๋ชจ๋‘์—๊ฒŒ ์ค‘์š”ํ•œ ์ฐธ๊ณ ์ž๋ฃŒ์ž…๋‹ˆ๋‹ค.

  2. hasCycle ์†”๋ฃจ์…˜: ํ˜„์žฌ ์Šฌ๋กœ์šฐ-ํŒจ์ŠคํŠธ ํฌ์ธํ„ฐ ๋ฐฉ์‹์ด ์ตœ์ ์ž…๋‹ˆ๋‹ค. ๋‹ค๋งŒ, ์ฃผ์„์ฒ˜๋ฆฌ๋œ ๋‹ค๋ฅธ ๋ฐฉ๋ฒ•๋„ ํฅ๋ฏธ๋กญ์ง€๋งŒ, ๊น”๋”ํ•œ ํ˜„์žฌ ๋ฒ„์ „์ด ๊ฐ€์žฅ ๊ถŒ์žฅ๋ฉ๋‹ˆ๋‹ค.

  3. maxProduct: ์Œ์ˆ˜์™€ 0์„ ๊ณ ๋ คํ•œ ๊ตฌํ˜„์ด ์ž˜ ๋˜์–ด์žˆ์Šต๋‹ˆ๋‹ค. ๋‹ค๋งŒ, prod_min๊ณผ prod_max๋ฅผ ์—…๋ฐ์ดํŠธํ•˜๋Š” ์ˆœ์„œ๋ฅผ ์กฐ์‹ฌํ•˜์„ธ์š”. ํ˜„์žฌ๋Š” prod_min์„ ๋จผ์ € ์—…๋ฐ์ดํŠธ ํ›„ ๋‹ค์‹œ prod_max๋ฅผ ์—…๋ฐ์ดํŠธํ•˜๋Š”๋ฐ, ์ด๋Ÿด ๊ฒฝ์šฐ ์ž„์‹œ ๋ณ€์ˆ˜(tmp)๋ฅผ ์‚ฌ์šฉํ•˜๋Š” ๊ฒƒ์ด ์•ˆ์ „ํ•˜๋ฉฐ, ๊ฐ€๋…์„ฑ๋„ ๋” ์ข‹์•„์ง‘๋‹ˆ๋‹ค.

  4. minWindow: ์Šฌ๋ผ์ด๋”ฉ ์œˆ๋„์šฐ์™€ ํ•ด์‹œ๋งต ์‚ฌ์šฉ์ด ์ ์ ˆํ•ฉ๋‹ˆ๋‹ค. ๋ณ€์ˆ˜๋ช… cnt๋Š” ์ง๊ด€์ ์ด๋ฉฐ, substr ๋Œ€์‹  formed ๊ฐ™์€ ์ด๋ฆ„๋„ ๊ณ ๋ คํ•ด ๋ณผ ์ˆ˜ ์žˆ์Šต๋‹ˆ๋‹ค. ๋˜ํ•œ, ์ •์ˆ˜ํ˜• ๋ณ€์ˆ˜ ์„ ์–ธ ์‹œ int substr = 0, min_l = 0, min_r = s.size();๋Š” ๋ช…ํ™•ํ•˜์ง€๋งŒ, min_r์€ ์ตœ๋Œ€๊ฐ’ ๋Œ€์‹  -1๋กœ ์ดˆ๊ธฐํ™” ํ›„ ์กฐ๊ฑด์„ ์กฐ์ •ํ•˜๋Š” ๊ฒƒ๋„ ๋ฐฉ๋ฒ•์ž…๋‹ˆ๋‹ค.

  5. pacificAtlantic: BFS๋กœ ํ•ด์ˆ˜๋ฉด์—์„œ ํ™•์žฅํ•˜๋Š” ์ ‘๊ทผ๋ฒ•์ด ํšจ์œจ์ ์ž…๋‹ˆ๋‹ค. ํ˜„์žฌ ๊ตฌํ˜„์€ ์ด์ค‘ BFS๋ฅผ ์ž˜ ์ ์šฉํ–ˆ์œผ๋ฉฐ, ๊ฐ€๋…์„ฑ๋„ ์ข‹์Šต๋‹ˆ๋‹ค. ๋‹ค๋งŒ, ๋ฐ˜๋ณต๋˜๋Š” ์ฝ”๋“œ๋ฅผ ํ•จ์ˆ˜๋กœ ๋ถ„๋ฆฌํ•˜๋ฉด ๋” ๊น”๋”ํ•  ์ˆ˜ ์žˆ์Šต๋‹ˆ๋‹ค.

์ „๋ฐ˜์ ์œผ๋กœ, ๊ฐ€๋…์„ฑ์ด ์ข‹๊ณ  ๊น”๋”ํ•œ ์ฝ”๋“œ์ž…๋‹ˆ๋‹ค! ์•ž์œผ๋กœ๋Š” ๊ฐ ๋ฌธ์ œ๋ณ„ ์‹œ๊ฐ„/๊ณต๊ฐ„ ๋ณต์žก๋„๋„ ๋ช…์‹œํ•˜๊ณ , ๋ณ€์ˆ˜๋ช…๊ณผ ์ดˆ๊ธฐํ™” ๋ฐฉ์‹์„ ์กฐ๊ธˆ ๋” ํ†ต์ผํ•˜๋ฉด ๋”์šฑ ์™„์„ฑ๋„๊ฐ€ ๋†’์•„์งˆ ๊ฒƒ ๊ฐ™์Šต๋‹ˆ๋‹ค. ๊พธ์ค€ํžˆ ์—ฐ์Šตํ•˜์…”์„œ ๋” ๋‹ค์–‘ํ•œ ๋ฌธ์ œ๋„ ๋„์ „ํ•ด๋ณด์‹œ๊ธธ ์‘์›ํ•ฉ๋‹ˆ๋‹ค!

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9์ฃผ์ฐจ ๋ฌธ์ œ ํ’€์ด ๊ณ ์ƒํ•˜์…จ์Šต๋‹ˆ๋‹ค.
๋ฌธ์ œ๋“ค ์ดํ•ดํ•˜์‹œ๊ณ  ์•Œ๊ณ ๋ฆฌ์ฆ˜ ์ถ”๋ก ํ•˜์‹œ๊ธฐ๊นŒ์ง€ ๊ณ ์ƒํ•˜์‹  ํ”์ ์ด ๋А๊ปด์ง€๋Š” ๋‹ต์•ˆ์ด๋„ค์š” :)
๋ฒŒ์จ ์ „์ฒด ์ผ์ • ์ค‘์— 2/3์ด๋‚˜ ๋‹ฌ๋ ค์˜ค์…จ๋„ค์š”!
10์ฃผ์ฐจ ๋ฌธ์ œ ํ’€์ด๋„ ํŒŒ์ดํŒ…์ž…๋‹ˆ๋‹ค!

@TonyKim9401 TonyKim9401 merged commit e3b2068 into DaleStudy:main Jan 10, 2026
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