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[socow] WEEK 13 solutions#2319

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TonyKim9401 merged 2 commits intoDaleStudy:mainfrom
socow:main
Feb 7, 2026
Merged

[socow] WEEK 13 solutions#2319
TonyKim9401 merged 2 commits intoDaleStudy:mainfrom
socow:main

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@socow
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@socow socow commented Feb 6, 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 Feb 7, 2026

์ข‹์€ ์ ์ด ๋งŽ์Šต๋‹ˆ๋‹ค! ์ฝ”๋“œ๋Š” ๊น”๋”ํ•˜๊ณ , BST์˜ ํŠน์„ฑ์„ ์ž˜ ํ™œ์šฉํ•˜์—ฌ ์‹œ๊ฐ„ ๋ณต์žก๋„๋ฅผ O(log n)์œผ๋กœ ๊ธฐ๋Œ€ํ•  ์ˆ˜ ์žˆ๊ฒŒ ๊ตฌํ˜„ํ•˜์…จ๋„ค์š”. ๋˜ํ•œ, ๋ฐ˜๋ณต๋ฌธ ๋ฐฉ์‹์œผ๋กœ ๊ตฌํ˜„ํ•˜์—ฌ ๊ณต๊ฐ„ ๋ณต์žก๋„๋„ O(1)๋กœ ์œ ์ง€ํ•œ ์ ๋„ ์šฐ์ˆ˜ํ•ฉ๋‹ˆ๋‹ค.

ํ”ผ๋“œ๋ฐฑ ๋“œ๋ฆฌ์ž๋ฉด:

  • ์‹œ๊ฐ„/๊ณต๊ฐ„ ๋ณต์žก๋„ ๋ถ„์„ ๋ช…์‹œ: ํ˜„์žฌ๋Š” ์ฝ”๋“œ ๋‚ด ์ฃผ์„์— TC, SC๋ฅผ ๋„ฃ์–ด์ฃผ์…จ๋Š”๋ฐ, ์กฐ๊ธˆ ๋” ๋ช…ํ™•ํ•˜๊ฒŒ "๊ท ํ˜• BST์—์„œ ํ‰๊ท  O(log n), ์ตœ์•… O(n)"์ž„์„ ๋ช…์‹œํ•˜๋Š” ๊ฒƒ๋„ ์ข‹๊ฒ ์Šต๋‹ˆ๋‹ค. ๋˜ํ•œ, ๊ณต๊ฐ„ ๋ณต์žก๋„๋Š” ๋ฐ˜๋ณต๋ฌธ์ด๋ฏ€๋กœ O(1)์ž„์„ ํ™•์‹คํžˆ ์ „๋‹ฌํ•˜๋Š”๊ฒŒ ์ข‹์•„์š”.
  • ๊ฐ€๋…์„ฑ๊ณผ ์Šคํƒ€์ผ: ๋ณ€์ˆ˜ ์ด๋ฆ„ cur๋Š” ์ง๊ด€์ ์ด์ง€๋งŒ, current ๋˜๋Š” node๋กœ ์ข€ ๋” ๋ช…ํ™•ํ•˜๊ฒŒ ํ‘œ๊ธฐํ•˜๋ฉด ์ข‹๊ฒ ์Šต๋‹ˆ๋‹ค.
  • ์ ‘๊ทผ๋ฒ• ์ œ์•ˆ: ๊ท ํ˜•์ด ์•„๋‹Œ ์ผ๋ฐ˜ BST๋ผ๋ฉด ์ตœ์•…์˜ ๊ฒฝ์šฐ O(n)์ด ๋  ์ˆ˜ ์žˆ์Œ์„ ์ฃผ์„์œผ๋กœ ๋ช…์‹œํ•˜๋Š” ๊ฒƒ๋„ ํ•™์Šต์— ๋„์›€์ด ๋  ๊ฒƒ ๊ฐ™์Šต๋‹ˆ๋‹ค.

์ „์ฒด์ ์œผ๋กœ ๋งค์šฐ ๊น”๋”ํ•˜๊ณ  ์ดํ•ดํ•˜๊ธฐ ์‰ฌ์šด ํ•ด๊ฒฐ๋ฒ•์ž…๋‹ˆ๋‹ค! ์ด ๋ฐฉ์‹์€ ํšจ์œจ์ ์ด๊ณ  ์ง๊ด€์ ์ด๊ธฐ์— ์ถ”์ฒœ๋“œ๋ฆด ๋งŒํ•ฉ๋‹ˆ๋‹ค. ์•ž์œผ๋กœ๋„ ์ด๋ ‡๊ฒŒ ๋ช…ํ™•ํ•˜๊ณ  ๊ฐ„๊ฒฐํ•œ ์ฝ”๋“œ ๊ธฐ๋Œ€ํ•˜๊ฒ ์Šต๋‹ˆ๋‹ค. ์ˆ˜๊ณ ํ•˜์…จ์–ด์š”!

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13์ฃผ์ฐจ ๋ฌธ์ œ ํ’€์ด ๊ณ ์ƒํ•˜์…จ์Šต๋‹ˆ๋‹ค.
์žฌ๊ท€ ๋ฐฉ์‹์œผ๋กœ ์ด์ง„ ํŠธ๋ฆฌ ์ˆœํšŒ ๋ฌธ์ œ ์ž˜ ํ’€์–ด๋‚ด์ฃผ์…จ๋„ค์š”!
์ด์ œ 2์ฃผ๋งŒ ๋” ์ง„ํ–‰ํ•˜์‹œ๋ฉด ์กธ์—…์ด์‹œ๋„ค์š”. ์Šคํ„ฐ๋”” ํ›„๊ธฐ ์–ธ์ œ๋“ ์ง€ ํŽผํ•˜์‹ค๋•Œ ๋‚จ๊ฒจ์ฃผ์‹œ๊ณ  14์ฃผ์ฐจ๋„ ํŒŒ์ดํŒ…์ž…๋‹ˆ๋‹ค!

@TonyKim9401 TonyKim9401 merged commit c8017a5 into DaleStudy:main Feb 7, 2026
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