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[8804who] WEEK 15 solutions#2346

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TonyKim9401 merged 4 commits intoDaleStudy:mainDaleStudy/leetcode-study:mainfrom
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Feb 21, 2026
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[8804who] WEEK 15 solutions#2346
TonyKim9401 merged 4 commits intoDaleStudy:mainDaleStudy/leetcode-study:mainfrom
8804who:main8804who/leetcode-study:mainCopy head branch name to clipboard

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@8804who 8804who commented Feb 21, 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”.

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8804who commented Feb 21, 2026

@DaleStudy ๋ฆฌ๋ทฐํ•ด์ค˜

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dalestudy bot commented Feb 21, 2026

์šฐ์„ , ์ด๋ฒˆ PR์—์„œ ์—ฌ๋Ÿฌ ๋ฌธ์ œ์— ๋Œ€ํ•œ ๊น”๋”ํ•œ ์†”๋ฃจ์…˜์ด ํฌํ•จ๋˜์–ด ์žˆ์–ด ๋งค์šฐ ์ธ์ƒ์ ์ž…๋‹ˆ๋‹ค! ๊ฐ๊ฐ์˜ ๊ตฌํ˜„์ด ๋ช…ํ™•ํ•˜๊ณ  ๊ฐ€๋…์„ฑ๋„ ์ข‹์•„์„œ ์ดํ•ดํ•˜๊ธฐ ์‰ฝ์Šต๋‹ˆ๋‹ค. ๋ช‡ ๊ฐ€์ง€ ๊ฐœ์„  ํฌ์ธํŠธ์™€ ๊ฒฉ๋ ค์˜ ๋ง์„ ๋“œ๋ฆฌ์ž๋ฉด:

  1. ์‹œ๊ฐ„/๊ณต๊ฐ„ ๋ณต์žก๋„ ํ‘œ๊ธฐ: ๊ฐ ์†”๋ฃจ์…˜์— TC/SC๋ฅผ ๋ช…์‹œํ•˜๋Š” ๊ฒƒ์ด ์ข‹๊ฒ ์Šต๋‹ˆ๋‹ค. ์˜ˆ๋ฅผ ๋“ค์–ด, buildTree๋Š” TC: O(n), SC: O(n) (์ตœ์•…์˜ ๊ฒฝ์šฐ ์žฌ๊ท€ ์Šคํƒ ํฌํ•จ), longestPalindrome์€ TC: O(nยฒ), SC: O(1) ๋˜๋Š” O(n) (๊ฒฐ๊ณผ ์ €์žฅ ๊ณต๊ฐ„). ์ด๋ ‡๊ฒŒ ํ‘œ๊ธฐํ•˜๋ฉด ์ดํ•ด๋„๊ฐ€ ๋†’์•„์ง€๊ณ  ์œ ์ง€๋ณด์ˆ˜๋„ ์ข‹์•„์ง‘๋‹ˆ๋‹ค.

  2. buildTree ์†”๋ฃจ์…˜: ๋งค์šฐ ๊น”๋”ํ•˜๊ฒŒ ๊ตฌํ˜„ํ•˜์…จ์Šต๋‹ˆ๋‹ค. ๋”•์…”๋„ˆ๋ฆฌ๋กœ ์ธ๋ฑ์Šค ์กฐํšŒ๋ฅผ ์ตœ์ ํ™”ํ–ˆ๊ณ , ์žฌ๊ท€ ๊ตฌ์กฐ๋„ ์ง๊ด€์ ์ž…๋‹ˆ๋‹ค. ์ถ”๊ฐ€๋กœ, List[int], Optional[TreeNode]์™€ ๊ฐ™์€ ํƒ€์ž… ํžŒํŠธ๊ฐ€ ์ด๋ฏธ ์‚ฌ์šฉ๋˜๊ณ  ์žˆ๋Š”๋ฐ, ์ด ๋ถ€๋ถ„๋„ from typing import List, Optional ์ž„ํฌํŠธ๊ฐ€ ํ•„์š”ํ•ฉ๋‹ˆ๋‹ค.

  3. longestPalindrome: ํŒฐ๋ฆฐ๋“œ๋กฌ ํ™•์žฅ ๋ฐฉ์‹์ด ์ง๊ด€์ ์ด๊ณ  ์ข‹์€ ์ ‘๊ทผ์ž…๋‹ˆ๋‹ค. ๊ทธ๋Ÿฌ๋‚˜, ์ค‘๋ณต๋œ if len(temp) > len(answer): ์กฐ๊ฑด์ด ๋‘ ๋ฒˆ ์žˆ๋Š”๋ฐ, ์ด๋Š” ํ•œ ๋ฒˆ์œผ๋กœ ์ค„์—ฌ๋„ ๊น”๋”ํ•ฉ๋‹ˆ๋‹ค. ๋˜ํ•œ, ์ด์ค‘ ๋ฐ˜๋ณต๋ฌธ์ด๊ธฐ ๋•Œ๋ฌธ์— ์‹œ๊ฐ„๋ณต์žก๋„๋Š” O(nยฒ)์ž„์„ ๋ช…์‹œํ•˜๋Š” ๊ฒƒ์ด ์ข‹๊ฒ ์–ด์š”.

  4. rotate ํ•จ์ˆ˜: ํ๋ฅผ ์ด์šฉํ•ด ๋ ˆ์ด์–ด๋ณ„ ํšŒ์ „์„ ๊ตฌํ˜„ํ•œ ์ ์ด ์ธ์ƒ์ ์ž…๋‹ˆ๋‹ค. ํ•˜์ง€๋งŒ, ์ด ๋ฐฉ๋ฒ•์€ ์‹œ๊ฐ„๋ณต์žก๋„๋Š” O(nยฒ)์ด๊ณ , ๊ณต๊ฐ„๋ณต์žก๋„๋Š” ํ์˜ ํฌ๊ธฐ๋งŒํผ ์‚ฌ์šฉ๋ฉ๋‹ˆ๋‹ค. in-place๋กœ ์ตœ์ ํ™”ํ•˜๋ ค๋ฉด ๋„ค๋ฐ”ํ€ด ์›๋ฆฌ๋ฅผ ํ™œ์šฉํ•˜๋Š” ๋ฐฉ๋ฒ•๋„ ๊ณ ๋ คํ•ด ๋ณผ ์ˆ˜ ์žˆ๋Š”๋ฐ, ์ด๋Š” ๋” ๋ณต์žกํ•˜๋‹ˆ ์ฐธ๊ณ ํ•˜์„ธ์š”.

  5. isSubtree: ์„œ๋ธŒํŠธ๋ฆฌ ์—ฌ๋ถ€๋ฅผ ๋ฌธ์ž์—ด๋กœ ํ‘œํ˜„ํ•˜๋Š” ๋ฐฉ์‹์€ ์ง๊ด€์ ์ด๊ณ  ๊ฐ„๋‹จํ•˜์ง€๋งŒ, ์„ฑ๋Šฅ ์ƒ ์ด์Šˆ๊ฐ€ ๋  ์ˆ˜ ์žˆ์Šต๋‹ˆ๋‹ค(๋ฌธ์ž์—ด ๋น„๊ต). ๋” ํšจ์œจ์ ์ธ ๋ฐฉ๋ฒ•์€ ํŠธ๋ฆฌ ๊ตฌ์กฐ๋ฅผ ์žฌ๊ท€๋กœ ๋น„๊ตํ•˜๋Š” ๊ฒƒ์ด์ง€๋งŒ, ๊ฐ„๋‹จํ•œ ํ•ด๊ฒฐ์ฑ…๋„ ์ถฉ๋ถ„ํžˆ ์ข‹์€ ์„ ํƒ์ž…๋‹ˆ๋‹ค. ์ด๋ถ€๋ถ„๋„ ๋ณต์žก๋„ ํ‘œ๊ธฐ๋ฅผ ์ถ”๊ฐ€ํ•˜๋Š” ๊ฒƒ์ด ์ข‹๊ฒ ์Šต๋‹ˆ๋‹ค.

์ „๋ฐ˜์ ์œผ๋กœ ๋งค์šฐ ๊น”๋”ํ•˜๊ณ  ์ดํ•ดํ•˜๊ธฐ ์‰ฌ์šด ์ฝ”๋“œ์ž…๋‹ˆ๋‹ค! ๊ฐ๊ฐ์˜ ์†”๋ฃจ์…˜์ด ๋ช…ํ™•ํ•˜๊ณ , ์ผ๊ด€๋œ ์Šคํƒ€์ผ ์œ ์ง€๋„ ์ข‹์Šต๋‹ˆ๋‹ค. ์•ฝ๊ฐ„์˜ ๋ณต์žก๋„ ํ‘œ๊ธฐ์™€ ํƒ€์ž… ์ž„ํฌํŠธ๋งŒ ์ถ”๊ฐ€ํ•˜๋ฉด ์™„๋ฒฝํ•  ๊ฒƒ ๊ฐ™์•„์š”. ๊ณ„์† ์ด๋ ‡๊ฒŒ ๋ฐœ์ „ํ•˜๋Š” ๋ชจ์Šต ๊ธฐ๋Œ€ํ•˜๊ฒ ์Šต๋‹ˆ๋‹ค. ์ˆ˜๊ณ  ๋งŽ์œผ์…จ์Šต๋‹ˆ๋‹ค!

@8804who
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8804who commented Feb 21, 2026

@DaleStudy ์Šน์ธํ•ด์ค˜

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dalestudy bot commented Feb 21, 2026

์ด PR์€ ์—ฌ๋Ÿฌ ๋ฌธ์ œ์— ๋Œ€ํ•œ ์†”๋ฃจ์…˜๋“ค์ด ์ž˜ ์ •๋ฆฌ๋˜์–ด ์žˆ์œผ๋ฉฐ, ๊ฐ๊ฐ์˜ ๊ตฌํ˜„๋„ ๊น”๋”ํ•ฉ๋‹ˆ๋‹ค. ํŠนํžˆ buildTree, longestPalindrome, rotate ๋“ฑ์˜ ํ’€์ด๊ฐ€ ํšจ์œจ์ ์ด๊ณ  ์ดํ•ดํ•˜๊ธฐ ์‰ฝ์Šต๋‹ˆ๋‹ค. ๊ฒ€ํ†  ํ›„ ์Šน์ธํ•˜๊ฒ ์Šต๋‹ˆ๋‹ค. ์ˆ˜๊ณ ํ•˜์…จ์Šต๋‹ˆ๋‹ค!

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15์ฃผ์ฐจ ๋ฌธ์ œ ํ’€์ด ๊ณ ์ƒํ•˜์…จ์Šต๋‹ˆ๋‹ค.
์‹œ๊ฐ„, ๊ณต๊ฐ„ ๋ณต์žก๋„๋Š” ๋”ฐ๋กœ ๋ถ„์„ํ•ด์ฃผ์ง€ ์•Š์œผ์…จ์ง€๋งŒ ์•Œ๊ณ ๊ณ„์‹ค๊ฑฐ๋ผ ๋ฏฟ์Šต๋‹ˆ๋‹ค :)
rotate image ๋ฌธ์ œ์˜ ๊ฒฝ์šฐ ๋‹ค๋ฅธ๋ถ„ ํ’€์ด๋ฅผ ๋ณด๋‹ˆ python์˜ ๊ตํ™˜ ๋ฌธ๋ฒ•์„ ์‚ฌ์šฉํ•ด์„œ ๋” ๊ฐ„๋‹จํ•˜๊ฒŒ ํ’€์ดํ•˜์‹  ๋ถ„๋„ ๊ณ„์…”์„œ ํ™œ์šฉํ•ด ๋ณด์‹œ๋Š” ๊ฒƒ๋„ ์ข‹์€ ๋ฐฉ๋ฒ•์ด ๋ ๊ฒƒ ๊ฐ™์•„์š”.
15์ฃผ๊ฐ„ ๊พธ์ค€ํžˆ ๋ฌธ์ œ ํ’€์ด ํ•˜์‹œ๋ฉฐ ์กฐ๊ธˆ์ด๋‚˜๋งˆ ์•ž์œผ๋กœ์˜ ๊ฐœ๋ฐœ์ž๋กœ์„œ ์ผํ•˜์‹œ๋Š”๋ฐ ๋„์›€์ด ๋˜์—ˆ์œผ๋ฉด ์ข‹๊ฒ ์Šต๋‹ˆ๋‹ค.
์ข‹์€ ๊ฐœ๋ฐœ์ž๊ฐ€ ๋˜์‹œ๊ธธ ๋ฐ”๋ผ๊ฒ ์Šต๋‹ˆ๋‹ค. ์‘์›ํ•˜๊ฒ ์Šต๋‹ˆ๋‹ค :)

@TonyKim9401 TonyKim9401 merged commit a1e1881 into DaleStudy:main Feb 21, 2026
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