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[chjung99] WEEK 10 solutions#2279

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chjung99 merged 5 commits intoDaleStudy:mainDaleStudy/leetcode-study:mainfrom
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Jan 17, 2026
Merged

[chjung99] WEEK 10 solutions#2279
chjung99 merged 5 commits intoDaleStudy:mainDaleStudy/leetcode-study:mainfrom
chjung99:mainchjung99/leetcode-study:mainCopy head branch name to clipboard

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@chjung99
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๋‹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”.

@chjung99
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@DaleStudy ๋ฆฌ๋ทฐํ•ด์ค˜

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dalestudy bot commented Jan 17, 2026

์ „์ฒด์ ์œผ๋กœ ์ž˜ ๊ตฌ์„ฑ๋œ ์ฝ”๋“œ์ž…๋‹ˆ๋‹ค. ํŠนํžˆ, ๊ฐ ๋ฌธ์ œ๋ณ„๋กœ ๋ช…ํ™•ํ•œ ๊ตฌ์กฐ์™€ ๊น”๋”ํ•œ ๊ตฌํ˜„์ด ๋‹๋ณด์ž…๋‹ˆ๋‹ค. ๋ช‡ ๊ฐ€์ง€ ๊ฐœ์„  ํฌ์ธํŠธ๋ฅผ ์ œ์•ˆ๋“œ๋ฆฌ์ž๋ฉด:

  1. ์‹œ๊ฐ„/๊ณต๊ฐ„ ๋ณต์žก๋„ ๋ช…์‹œ: ๋ชจ๋“  ์ฝ”๋“œ์— ์‹œ๊ฐ„๊ณผ ๊ณต๊ฐ„ ๋ณต์žก๋„ ๋ถ„์„์ด ๋น ์ ธ ์žˆ๋Š”๋ฐ, ์˜ˆ๋ฅผ ๋“ค์–ด WordDictionary์˜ ๊ฒ€์ƒ‰์€ O(n) (๋‹จ์–ด ๊ธธ์ด), houseRobber์˜ DP๋Š” O(n)์ด๊ณ , NumberOfIslands๋Š” BFS๋กœ O(n*m)์ž…๋‹ˆ๋‹ค. ์ด๋ฅผ ์ฃผ์„ ๋˜๋Š” ์ฝ”๋“œ ๋‚ด์— ๋ช…์‹œํ•˜๋ฉด ๊ฐ€๋…์„ฑ๊ณผ ์ดํ•ด๋„๊ฐ€ ๋†’์•„์ง‘๋‹ˆ๋‹ค.

  2. ์ค‘๋ณต ์ฝ”๋“œ ์ตœ์ ํ™”: rob ํ•จ์ˆ˜์—์„œ Arrays.copyOfRange๋ฅผ ํ˜ธ์ถœํ•˜๋Š” ๋Œ€์‹ , ์ธ๋ฑ์Šค๋ฅผ ํ™œ์šฉํ•˜๋Š” ๋ฐฉ๋ฒ•๋„ ๊ณ ๋ คํ•ด๋ณด์„ธ์š”. ์ด๋Š” ๋ถˆํ•„์š”ํ•œ ๋ฐฐ์—ด ๋ณต์‚ฌ๋ฅผ ๋ฐฉ์ง€ํ•˜์—ฌ ์„ฑ๋Šฅ ํ–ฅ์ƒ์— ๋„์›€์ด ๋  ์ˆ˜ ์žˆ์Šต๋‹ˆ๋‹ค.

  3. ๊ฐ€๋…์„ฑ ํ–ฅ์ƒ: ์ผ๋ถ€ ๋ณ€์ˆ˜๋ช…(node, n, m, dp)์€ ์ ์ ˆํ•˜์ง€๋งŒ, dfs์™€ ๊ฐ™์€ ์žฌ๊ท€ ํ˜ธ์ถœ ํ•จ์ˆ˜๋ช…์€ ๋ช…ํ™•ํ•˜๊ฒŒ ์œ ์ง€๋˜๊ณ  ์žˆ์–ด ์ข‹์Šต๋‹ˆ๋‹ค. ๋‹ค๋งŒ, Point ํด๋ž˜์Šค์—์„œ x, y ๋Œ€์‹  row, col๋กœ ๋ช…๋ช…ํ•˜๋ฉด ๋” ์ง๊ด€์ ์ผ ์ˆ˜ ์žˆ์Šต๋‹ˆ๋‹ค.

  4. ์ผ๊ด€๋œ ์Šคํƒ€์ผ: ๋“ค์—ฌ์“ฐ๊ธฐ์™€ ๊ณต๋ฐฑ์€ ์ผ๊ด€์ ์ด์ง€๋งŒ, ์˜ˆ๋ฅผ ๋“ค์–ด for ๋ฃจํ”„์˜ ๊ด„ํ˜ธ ์‚ฌ์ด์— ๊ณต๋ฐฑ์„ ๋„ฃ๊ฑฐ๋‚˜, if ์กฐ๊ฑด๋ฌธ ๋’ค์— ํ•œ ์ค„ ๋„์šฐ๋Š” ๋“ฑ ์Šคํƒ€์ผ ์ผ๊ด€์„ฑ์„ ์œ ์ง€ํ•˜๋ฉด ๋” ๊น”๋”ํ•ฉ๋‹ˆ๋‹ค.

  5. ์ถ”๊ฐ€ ์ตœ์ ํ™” ๊ฐ€๋Šฅ์„ฑ: houseRobber๋Š” ํ˜„์žฌ DP ๋ฐฐ์—ด์„ ์‚ฌ์šฉํ•˜์ง€๋งŒ, ๊ณต๊ฐ„์„ O(1)๋กœ ์ค„์ผ ์ˆ˜ ์žˆ์Šต๋‹ˆ๋‹ค. ์˜ˆ๋ฅผ ๋“ค์–ด, ๋‘ ๋ณ€์ˆ˜(prev, curr)๋งŒ ์œ ์ง€ํ•˜๋Š” ๋ฐฉ๋ฒ•๋„ ๊ณ ๋ คํ•ด๋ณด์„ธ์š”.

์ „์ฒด์ ์œผ๋กœ ์ดํ•ดํ•˜๊ธฐ ์‰ฝ๊ณ  ๊น”๋”ํ•œ ๊ตฌํ˜„์ž…๋‹ˆ๋‹ค. ์ด๋Ÿฌํ•œ ์ž‘์€ ๊ฐœ์„ ์œผ๋กœ ์„ฑ๋Šฅ๊ณผ ๊ฐ€๋…์„ฑ์„ ๋” ๋†’์ผ ์ˆ˜ ์žˆ์œผ๋‹ˆ ์ฐธ๊ณ ํ•˜์‹œ๊ธฐ ๋ฐ”๋ž๋‹ˆ๋‹ค. ๊ณ„์†ํ•ด์„œ ์ข‹์€ ์ฝ”๋“œ ๊ธฐ๋Œ€ํ• ๊ฒŒ์š”!

@chjung99
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@DaleStudy ์Šน์ธ

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์Šน์ธ๋˜์—ˆ์Šต๋‹ˆ๋‹ค! ๐Ÿ‘

@chjung99 chjung99 merged commit 0883157 into DaleStudy:main Jan 17, 2026
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