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[OstenHun] WEEK 01 solutions #2385

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OstenHun merged 1 commit intoDaleStudy:mainDaleStudy/leetcode-study:mainfrom
OstenHun:mainOstenHun/leetcode-study:mainCopy head branch name to clipboard
Mar 8, 2026
Merged

[OstenHun] WEEK 01 solutions #2385
OstenHun merged 1 commit intoDaleStudy:mainDaleStudy/leetcode-study:mainfrom
OstenHun:mainOstenHun/leetcode-study:mainCopy head branch name to clipboard

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@OstenHun
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@OstenHun OstenHun commented Mar 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”.

@OstenHun
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OstenHun commented Mar 8, 2026

@DaleStudy ๋ฆฌ๋ทฐํ•ด์ค˜

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dalestudy bot commented Mar 8, 2026

์šฐ์„ , ๋ฌธ์ œ ํ•ด๊ฒฐ์„ ์œ„ํ•ด ์—ฌ๋Ÿฌ ์ ‘๊ทผ๋ฒ•์„ ์‹œ๋„ํ•˜๋ฉฐ ์ ์ง„์ ์œผ๋กœ ๊ฐœ์„ ํ•œ ๋ชจ์Šต์ด ์ธ์ƒ์ ์ž…๋‹ˆ๋‹ค. ํŠนํžˆ, ๋งˆ์ง€๋ง‰์—๋Š” ํ•ด์‹œ์…‹์„ ํ™œ์šฉํ•œ ์ตœ์ ํ™”๋œ ๋ฐฉ๋ฒ•์„ ๋„์ž…ํ•œ ์ ์ด ์ข‹์Šต๋‹ˆ๋‹ค. ๋ช‡ ๊ฐ€์ง€ ํ”ผ๋“œ๋ฐฑ ๋“œ๋ฆฌ์ž๋ฉด:

  1. ์‹œ๊ฐ„/๊ณต๊ฐ„ ๋ณต์žก๋„ ๋ช…์‹œ: ๋งˆ์ง€๋ง‰ ๊ตฌํ˜„์— TC: O(n), SC: O(n)์œผ๋กœ ๋ช…์‹œํ•˜๋Š” ๊ฒƒ์„ ์ถ”์ฒœํ•ฉ๋‹ˆ๋‹ค. ์ด๋Š” ์ฝ”๋“œ์˜ ํšจ์œจ์„ฑ์„ ์ดํ•ดํ•˜๋Š” ๋ฐ ๋„์›€๋ฉ๋‹ˆ๋‹ค.

  2. ๊ฐ€๋…์„ฑ ๋ฐ ์Šคํƒ€์ผ: ๋งˆ์ง€๋ง‰ ๋ฒ„์ „์—์„œ๋Š” nums.reserve(n);๋ฅผ ์‚ฌ์šฉํ•˜์—ฌ ๋ฉ”๋ชจ๋ฆฌ ํ• ๋‹น์„ ์ตœ์ ํ™”ํ•œ ์ ์ด ์ข‹์Šต๋‹ˆ๋‹ค. ๋‹ค๋งŒ, using namespace std;๋Š” ๊ฐ€๋Šฅํ•˜๋ฉด ํ”ผํ•˜๋Š” ๊ฒƒ์ด ๋” ์ข‹์€ ์Šต๊ด€์ž…๋‹ˆ๋‹ค. ๋Œ€์‹  std::๋ฅผ ๋ช…์‹œํ•˜๋Š” ๊ฒƒ๋„ ๊ฐ€๋…์„ฑ์— ๋„์›€์ด ๋ฉ๋‹ˆ๋‹ค.

  3. ์ฝ”๋“œ ์ •๋ฆฌ: ๋ถˆํ•„์š”ํ•œ ์ฃผ์„์ด๋‚˜ ์ด์ „ ๋ฐฉ๋ฒ•์— ๋Œ€ํ•œ ์„ค๋ช…์€ ์ œ๊ฑฐํ•˜๊ฑฐ๋‚˜ ๋ณ„๋„ ๋ฌธ์„œ๋กœ ์ •๋ฆฌํ•˜๋Š” ๊ฒƒ์ด ๊น”๋”ํ•ฉ๋‹ˆ๋‹ค. ์ œ์ถœ ์‹œ์—๋Š” ๋งˆ์ง€๋ง‰ ๊น”๋”ํ•œ ๋ฒ„์ „๋งŒ ๋‚จ๊ธฐ๊ณ , ํ•„์š”ํ•˜๋ฉด ๊นƒํ—ˆ๋ธŒ์˜ ์ปค๋ฐ‹ ๋ฉ”์‹œ์ง€ ๋˜๋Š” ๋ฌธ์„œ๋กœ ์„ค๋ช…ํ•˜๋Š” ๊ฒƒ์ด ์ข‹์Šต๋‹ˆ๋‹ค.

  4. ์ถ”๊ฐ€ ์ œ์•ˆ: C++20 ์ด์ƒ์—์„œ๋Š” std::unordered_set ๋Œ€์‹  std::unordered_set์˜ contains() ๋ฉ”์„œ๋“œ(๊ตฌ๋ฒ„์ „์€ count() ํ˜น์€ find()๋ฅผ ์‚ฌ์šฉ) ํ™œ์šฉ๋„ ๊ณ ๋ คํ•  ์ˆ˜ ์žˆ์Šต๋‹ˆ๋‹ค.

์ „์ฒด์ ์œผ๋กœ, ์—ฌ๋Ÿฌ ๋ฐฉ๋ฒ•์„ ์‹คํ—˜ํ•˜๋ฉฐ ์ตœ์ ์˜ ์†”๋ฃจ์…˜์— ๋„๋‹ฌํ•˜๋Š” ๊ณผ์ •์ด ํ›Œ๋ฅญํ•˜๋ฉฐ, ๋งˆ์ง€๋ง‰ ๋ฒ„์ „์€ ๊น”๋”ํ•˜๊ณ  ํšจ์œจ์ ์ž…๋‹ˆ๋‹ค. ์•ž์œผ๋กœ๋„ ๋‹ค์–‘ํ•œ ๋ฐ์ดํ„ฐ ๊ตฌ์กฐ์™€ ์•Œ๊ณ ๋ฆฌ์ฆ˜์„ ์‹คํ—˜ํ•˜๋Š” ํƒœ๋„๋ฅผ ์œ ์ง€ํ•˜์„ธ์š”!

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OstenHun commented Mar 8, 2026

@DaleStudy ์Šน์ธ

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์Šน์ธ๋˜์—ˆ์Šต๋‹ˆ๋‹ค! ๐Ÿ‘

@OstenHun OstenHun merged commit 4759a12 into DaleStudy:main Mar 8, 2026
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