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[chjung99] WEEK 07 solutions#2233

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chjung99 merged 5 commits intoDaleStudy:mainDaleStudy/leetcode-study:mainfrom
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Dec 29, 2025
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[chjung99] WEEK 07 solutions#2233
chjung99 merged 5 commits intoDaleStudy:mainDaleStudy/leetcode-study:mainfrom
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@chjung99 chjung99 commented Dec 29, 2025

๋‹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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@DaleStudy ๋ฆฌ๋ทฐํ•ด์ค˜

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dalestudy bot commented Dec 29, 2025

์ „๋ฐ˜์ ์œผ๋กœ ๊น”๋”ํ•œ ๊ตฌํ˜„๊ณผ ๋‹ค์–‘ํ•œ ๋ฌธ์ œ ํ•ด๊ฒฐ ๋ฐฉ๋ฒ•์ด ์ž˜ ๋“œ๋Ÿฌ๋‚˜ ์žˆ์Šต๋‹ˆ๋‹ค. ํŠนํžˆ DFS์™€ DP, ์ •๋ ฌ, ํ•ด์‹œ์…‹ ํ™œ์šฉ ๋“ฑ ์—ฌ๋Ÿฌ ์•Œ๊ณ ๋ฆฌ์ฆ˜ ๊ธฐ๋ฒ•์„ ์ ์ ˆํžˆ ํ™œ์šฉํ•˜์…จ๋„ค์š”. ๋ช‡ ๊ฐ€์ง€ ๊ฐœ์„  ํฌ์ธํŠธ๋ฅผ ๋“œ๋ฆฌ์ž๋ฉด:

  1. ์‹œ๊ฐ„/๊ณต๊ฐ„ ๋ณต์žก๋„ ๋ถ„์„: ๊ฐ ํ’€์ด์— ๋Œ€ํ•œ ์‹œ๊ฐ„๊ณผ ๊ณต๊ฐ„ ๋ณต์žก๋„ ์ฃผ์„์„ ์ถ”๊ฐ€ํ•˜๋Š” ๊ฒƒ์ด ์ข‹๊ฒ ์Šต๋‹ˆ๋‹ค. ์˜ˆ๋ฅผ ๋“ค์–ด, decode-ways๋Š” TC: O(n), SC: O(n) (๋ฉ”๋ชจ์ด์ œ์ด์…˜์„ ์œ„ํ•ด), set-matrix-zeroes๋Š” TC: O(mn), SC: O(m + n) ์ •๋„๋กœ ๋ช…ํ™•ํžˆ ํ‘œ๊ธฐํ•˜๋ฉด ๊ฐ€๋…์„ฑ๊ณผ ์ดํ•ด์— ๋„์›€์ด ๋ฉ๋‹ˆ๋‹ค.

  2. decode-ways DFS + ๋ฉ”๋ชจ์ด์ œ์ด์…˜: ํ˜„์žฌ ๊ตฌํ˜„์€ ํšจ์œจ์ ์ด๋ฉฐ, isDecodable() ํ•จ์ˆ˜๋„ ๋ช…ํ™•ํ•ฉ๋‹ˆ๋‹ค. ๊ทธ๋Ÿฌ๋‚˜ substring() ํ˜ธ์ถœ ๋Œ€์‹  charAt()์œผ๋กœ ๋ฐ”๋กœ ๋น„๊ตํ•˜๋Š” ๋ฐฉ๋ฒ•๋„ ๊ณ ๋ คํ•ด๋ณผ ์ˆ˜ ์žˆ์Šต๋‹ˆ๋‹ค. ์ด๋Š” ์„ฑ๋Šฅ ํ–ฅ์ƒ์— ๋„์›€์ด ๋ฉ๋‹ˆ๋‹ค.

  3. insert-interval: ์ •๋ ฌ ํ›„ ๋ณ‘ํ•ฉ ๊ณผ์ •์€ ๊น”๋”ํ•˜์ง€๋งŒ, deque ๋Œ€์‹  ArrayList๋กœ ์œ ์ง€ํ•˜๋Š” ๊ฒƒ๋„ ์ถฉ๋ถ„ํžˆ ๊ฐ€๋Šฅํ•˜๋ฉฐ, ์ฝ”๋“œ๊ฐ€ ๋” ๊ฐ„๋‹จํ•  ์ˆ˜ ์žˆ์Šต๋‹ˆ๋‹ค. ๋˜ํ•œ, Interval ํด๋ž˜์Šค๋ฅผ Comparable๋กœ ๊ตฌํ˜„ํ•˜์…จ๋Š”๋ฐ, Collections.sort() ์ดํ›„ ๋ณ‘ํ•ฉ ๊ณผ์ •์—์„œ ๋” ์ง๊ด€์ ์ด๊ณ  ํšจ์œจ์ ์ธ ๋ณ‘ํ•ฉ ๋ฐฉ๋ฒ•์„ ์‚ฌ์šฉํ•  ์ˆ˜ ์žˆ์Šต๋‹ˆ๋‹ค.

  4. set-matrix-zeroes: ํ•ด์‹œ์…‹์œผ๋กœ ํ–‰๊ณผ ์—ด์„ ์ €์žฅํ•˜๋Š” ๋ฐฉ์‹์€ ์ง๊ด€์ ์ด๊ณ  ๊น”๋”ํ•ฉ๋‹ˆ๋‹ค. ํ•˜์ง€๋งŒ, ๊ณต๊ฐ„ ๋ณต์žก๋„๋ฅผ ๊ณ ๋ คํ•˜๋ฉด ์ฒซ ํ–‰๊ณผ ์—ด์— ํ”Œ๋ž˜๊ทธ๋ฅผ ์ €์žฅํ•˜๋Š” ๋ฐฉ๋ฒ•๋„ ์žˆ์Šต๋‹ˆ๋‹ค. ๊ฐ€๋…์„ฑ์€ ์œ ์ง€ํ•˜๋ฉด์„œ ๊ณต๊ฐ„์„ ์ ˆ์•ฝํ•  ์ˆ˜ ์žˆ์ฃ .

  5. unique-paths: DP ๋ฐฉ์‹์ด ๋ช…ํ™•ํ•˜๋ฉฐ ํšจ์œจ์ ์ž…๋‹ˆ๋‹ค. dp ๋ฐฐ์—ด ํฌ๊ธฐ๋ฅผ (m+1) x (n+1)๋กœ ํ•˜์…จ๋Š”๋ฐ, (m x n)์œผ๋กœ๋„ ์ถฉ๋ถ„ํ•˜๋ฉฐ ๋” ์ง๊ด€์ ์ผ ์ˆ˜ ์žˆ์Šต๋‹ˆ๋‹ค.

  6. word-search: DFS, ๋ฐฑํŠธ๋ž˜ํ‚น ๊ตฌํ˜„์ด ๊น”๋”ํ•ฉ๋‹ˆ๋‹ค. answer ํ”Œ๋ž˜๊ทธ ๋Œ€์‹ , ์žฌ๊ท€ ํ˜ธ์ถœ์ด ์ข…๋ฃŒ๋˜๋ฉด ๋ฐ”๋กœ ๋ฐ˜ํ™˜ํ•˜๋Š” ๋ฐฉ์‹๋„ ๊ณ ๋ คํ•ด๋ณผ ์ˆ˜ ์žˆ์Šต๋‹ˆ๋‹ค. visit ๋ฐฐ์—ด ํ™œ์šฉ๋„ ์ ์ ˆํ•˜๋ฉฐ, outOfRange() ํ•จ์ˆ˜๋„ ๋ช…ํ™•ํ•ฉ๋‹ˆ๋‹ค.

์ „๋ฐ˜์ ์œผ๋กœ ์ฝ”๋“œ ์Šคํƒ€์ผ์ด ๊น”๋”ํ•˜๊ณ  ๋ฌธ์ œ ํ•ด๊ฒฐ ๋ฐฉ๋ฒ•๋„ ์ ์ ˆํ•ฉ๋‹ˆ๋‹ค. ์•ฝ๊ฐ„์˜ ์ตœ์ ํ™”์™€ ์ฃผ์„ ์ถ”๊ฐ€, ๋ณต์žก๋„ ๋ช…์‹œ๋กœ ๊ฐ€๋…์„ฑ๊ณผ ์œ ์ง€๋ณด์ˆ˜์„ฑ์„ ๋” ๋†’์ผ ์ˆ˜ ์žˆ๊ฒ ์Šต๋‹ˆ๋‹ค. ์ˆ˜๊ณ ํ•˜์…จ๊ณ , ์•ž์œผ๋กœ๋„ ๋‹ค์–‘ํ•œ ์•Œ๊ณ ๋ฆฌ์ฆ˜ ๋ฌธ์ œ ํ•ด๊ฒฐ ๋Šฅ๋ ฅ์„ ๊ธฐ๋Œ€ํ•ฉ๋‹ˆ๋‹ค!

@chjung99 chjung99 requested review from a team and removed request for a team December 29, 2025 12:37
@DaleStudy DaleStudy deleted a comment from dalestudy bot Dec 29, 2025
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@DaleStudy ์Šน์ธํ•ด์ค˜

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dalestudy bot commented Dec 29, 2025

์ฝ”๋“œ๊ฐ€ ๊น”๋”ํ•˜๊ฒŒ ๊ตฌ์„ฑ๋˜์–ด ์žˆ๊ณ , ๋กœ์ง๋„ ๋ช…ํ™•ํ•ด์„œ ๋ฌธ์ œ ํ•ด๊ฒฐ์— ์ ํ•ฉํ•ฉ๋‹ˆ๋‹ค. ํŠนํžˆ dfs์™€ ๋ฉ”๋ชจ์ด์ œ์ด์…˜์„ ํ™œ์šฉํ•œ decode-ways ๊ตฌํ˜„์ด ํšจ์œจ์ ์ž…๋‹ˆ๋‹ค. ๋˜ํ•œ, ์‚ฝ์ž…, ์ œ๋กœ ์ฒ˜๋ฆฌ, ๊ฒฝ๋กœ ๊ณ„์‚ฐ ๋“ฑ ๋‹ค์–‘ํ•œ ๋ฌธ์ œ์— ๋Œ€ํ•ด ์ž˜ ์ž‘์„ฑํ•˜์…จ์Šต๋‹ˆ๋‹ค. ์ „์ฒด์ ์œผ๋กœ ์ž˜ ํ•˜์…จ์œผ๋ฉฐ, ๋ฆฌ๋ทฐ ์Šน์ธ ๋“œ๋ฆฝ๋‹ˆ๋‹ค!

@chjung99 chjung99 requested a review from 8804who December 29, 2025 12:42
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@DaleStudy approve

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์Šน์ธ๋˜์—ˆ์Šต๋‹ˆ๋‹ค! ๐Ÿ‘

@chjung99 chjung99 removed the request for review from 8804who December 29, 2025 12:42
@chjung99 chjung99 merged commit 8887013 into DaleStudy:main Dec 29, 2025
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