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[juhui-jeong] WEEK 12 Solutions#2606

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[juhui-jeong] WEEK 12 Solutions#2606
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@juhui-jeong juhui-jeong commented May 19, 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”.

@dalestudy
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dalestudy Bot commented May 19, 2026

๐Ÿ“Š juhui-jeong ๋‹˜์˜ ํ•™์Šต ํ˜„ํ™ฉ

์ด๋ฒˆ ์ฃผ ์ œ์ถœ ๋ฌธ์ œ

๋ฌธ์ œ ๋‚œ์ด๋„ ์œ ํ˜• ๋ถ„์„
non-overlapping-intervals Medium โš ๏ธ ์œ ํ˜• ๋ถˆ์ผ์น˜
remove-nth-node-from-end-of-list Medium โš ๏ธ ์œ ํ˜• ๋ถˆ์ผ์น˜
same-tree Easy โœ… ์˜๋„ํ•œ ์œ ํ˜•
serialize-and-deserialize-binary-tree Hard โœ… ์˜๋„ํ•œ ์œ ํ˜•

๋ˆ„์  ํ•™์Šต ์š”์•ฝ

  • ํ’€์ดํ•œ ๋ฌธ์ œ: 17 / 75๊ฐœ
  • ์ด๋ฒˆ ์ฃผ ์œ ํ˜• ์ผ์น˜์œจ: 50% (4๋ฌธ์ œ ์ค‘ 2๋ฌธ์ œ ์ผ์น˜)

๋ฌธ์ œ ํ’€์ด ํ˜„ํ™ฉ

์นดํ…Œ๊ณ ๋ฆฌ ์ง„ํ–‰๋„ ์™„๋ฃŒ
Array โ– โ– โ– โ–กโ–กโ–กโ–ก 4 / 10 (Easy 3, Medium 1)
String โ– โ– โ– โ–กโ–กโ–กโ–ก 4 / 10 (Medium 1, Easy 3)
Linked List โ– โ– โ–กโ–กโ–กโ–กโ–ก 2 / 6 (Easy 2)
Heap โ– โ– โ–กโ–กโ–กโ–กโ–ก 1 / 3 (Medium 1)
Binary โ– โ–กโ–กโ–กโ–กโ–กโ–ก 1 / 5 (Easy 1)
Dynamic Programming โ– โ–กโ–กโ–กโ–กโ–กโ–ก 2 / 11 (Easy 1, Medium 1)
Tree โ– โ–กโ–กโ–กโ–กโ–กโ–ก 2 / 14 (Easy 2)
Graph โ– โ–กโ–กโ–กโ–กโ–กโ–ก 1 / 8 (Medium 1)
Interval โ–กโ–กโ–กโ–กโ–กโ–กโ–ก 0 / 5 โ† ์•„์ง ์‹œ์ž‘ ์•ˆ ํ•จ
Matrix โ–กโ–กโ–กโ–กโ–กโ–กโ–ก 0 / 4 โ† ์•„์ง ์‹œ์ž‘ ์•ˆ ํ•จ

๐Ÿค– ์ด ๋Œ“๊ธ€์€ GitHub App์„ ํ†ตํ•ด ์ž๋™์œผ๋กœ ์ž‘์„ฑ๋˜์—ˆ์Šต๋‹ˆ๋‹ค.

๐Ÿ”ข API ์‚ฌ์šฉ๋Ÿ‰ (gpt-4.1-nano)
์š”์ฒญ ์ž…๋ ฅ ํ† ํฐ ์ถœ๋ ฅ ํ† ํฐ ํ•ฉ๊ณ„ ๋น„์šฉ
1 510 29 539 $0.000063
2 1,222 61 1,283 $0.000147
3 1,864 91 1,955 $0.000223
4 2,330 129 2,459 $0.000285
ํ•ฉ๊ณ„ 5,926 310 6,236 $0.000717

@Cyjin-jani Cyjin-jani self-requested a review May 21, 2026 14:56
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๐Ÿท๏ธ ์•Œ๊ณ ๋ฆฌ์ฆ˜ ํŒจํ„ด ๋ถ„์„

  • ํŒจํ„ด: Greedy, Sorting
  • ์„ค๋ช…: ์ด ์ฝ”๋“œ๋Š” ์ธํ„ฐ๋ฒŒ ์ •๋ ฌ ํ›„, ๊ฒน์นจ ์—ฌ๋ถ€๋ฅผ ํŒ๋‹จํ•˜์—ฌ ์ตœ์†Œ ์ œ๊ฑฐ ๊ฐœ์ˆ˜๋ฅผ ์ฐพ๋Š” greedy ์ „๋žต์„ ์‚ฌ์šฉํ•˜๋ฉฐ, ์ •๋ ฌ์€ ๋ฌธ์ œ ํ•ด๊ฒฐ์— ํ•ต์‹ฌ์ ์ž…๋‹ˆ๋‹ค.

๐Ÿ“Š ์‹œ๊ฐ„/๊ณต๊ฐ„ ๋ณต์žก๋„ ๋ถ„์„

โ„น๏ธ ์ด ํŒŒ์ผ์—๋Š” 3๊ฐ€์ง€ ํ’€์ด๊ฐ€ ํฌํ•จ๋˜์–ด ์žˆ์–ด ๊ฐ๊ฐ ๋ถ„์„ํ•ฉ๋‹ˆ๋‹ค.

ํ’€์ด 1: Solution.eraseOverlapIntervals โ€” Time: O(n log n) / Space: O(1)
๋ณต์žก๋„
Time O(n log n)
Space O(1)

ํ”ผ๋“œ๋ฐฑ: ๋ฐฐ์—ด ์ •๋ ฌ์ด O(n log n)์ด๊ณ , ์ดํ›„ ํ•œ ๋ฒˆ ์ˆœํšŒํ•˜๋Š” O(n)์ด๋ฏ€๋กœ ์ „์ฒด ์‹œ๊ฐ„ ๋ณต์žก๋„๋Š” O(n log n)์ž…๋‹ˆ๋‹ค. ์ •๋ ฌ ํ›„ ๋ณ„๋„ ์ž๋ฃŒ๊ตฌ์กฐ๋ฅผ ์‚ฌ์šฉํ•˜์ง€ ์•Š์œผ๋ฏ€๋กœ ๊ณต๊ฐ„ ๋ณต์žก๋„๋Š” O(1)์ž…๋‹ˆ๋‹ค.

๊ฐœ์„  ์ œ์•ˆ: ํ˜„์žฌ ๊ตฌํ˜„์ด ์ ์ ˆํ•ด ๋ณด์ž…๋‹ˆ๋‹ค.

ํ’€์ด 2: Solution.eraseOverlapIntervals โ€” Time: O(n log n) / Space: O(1)
๋ณต์žก๋„
Time O(n log n)
Space O(1)

ํ”ผ๋“œ๋ฐฑ: ๋ฐฐ์—ด ์ •๋ ฌ์ด O(n log n)์ด๊ณ , ์ดํ›„ ํ•œ ๋ฒˆ ์ˆœํšŒํ•˜๋Š” O(n)์ด๋ฏ€๋กœ ์ „์ฒด ์‹œ๊ฐ„ ๋ณต์žก๋„๋Š” O(n log n)์ž…๋‹ˆ๋‹ค. ์ •๋ ฌ ํ›„ ๋ณ„๋„ ์ž๋ฃŒ๊ตฌ์กฐ๋ฅผ ์‚ฌ์šฉํ•˜์ง€ ์•Š์œผ๋ฏ€๋กœ ๊ณต๊ฐ„ ๋ณต์žก๋„๋Š” O(1)์ž…๋‹ˆ๋‹ค.

๊ฐœ์„  ์ œ์•ˆ: ํ˜„์žฌ ๊ตฌํ˜„์ด ์ ์ ˆํ•ด ๋ณด์ž…๋‹ˆ๋‹ค.

ํ’€์ด 3: Solution.eraseOverlapIntervals โ€” Time: โœ… O(n log n) โ†’ O(n log n) / Space: โŒ O(n) โ†’ O(1)
์œ ์ € ๋ถ„์„ ์‹ค์ œ ๋ถ„์„ ๊ฒฐ๊ณผ
Time O(n log n) O(n log n) โœ…
Space O(n) O(1) โŒ

ํ”ผ๋“œ๋ฐฑ: ๋ฐฐ์—ด ์ •๋ ฌ์ด O(n log n)์ด๊ณ , ์ดํ›„ ํ•œ ๋ฒˆ ์ˆœํšŒํ•˜๋Š” O(n)์ด๋ฏ€๋กœ ์ „์ฒด ์‹œ๊ฐ„ ๋ณต์žก๋„๋Š” O(n log n)์ž…๋‹ˆ๋‹ค. ์ •๋ ฌ ํ›„ ๋ณ„๋„ ์ž๋ฃŒ๊ตฌ์กฐ๋ฅผ ์‚ฌ์šฉํ•˜์ง€ ์•Š์œผ๋ฏ€๋กœ ๊ณต๊ฐ„ ๋ณต์žก๋„๋Š” O(1)์ž…๋‹ˆ๋‹ค.

๊ฐœ์„  ์ œ์•ˆ: ํ˜„์žฌ ๊ตฌํ˜„์ด ์ ์ ˆํ•ด ๋ณด์ž…๋‹ˆ๋‹ค.

๐Ÿ’ก ํ’€์ด์— ์‹œ๊ฐ„/๊ณต๊ฐ„ ๋ณต์žก๋„๋ฅผ ์ฃผ์„์œผ๋กœ ๋‚จ๊ฒจ๋ณด์„ธ์š”!

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๐Ÿท๏ธ ์•Œ๊ณ ๋ฆฌ์ฆ˜ ํŒจํ„ด ๋ถ„์„

  • ํŒจํ„ด: Two Pointers
  • ์„ค๋ช…: ์ด ์ฝ”๋“œ๋Š” ๋น ๋ฅธ ํฌ์ธํ„ฐ(fast)์™€ ๋А๋ฆฐ ํฌ์ธํ„ฐ(slow)๋ฅผ ์‚ฌ์šฉํ•˜์—ฌ ๋ฆฌ์ŠคํŠธ์˜ ๋์—์„œ n๋ฒˆ์งธ ๋…ธ๋“œ๋ฅผ ์ฐพ๊ณ  ์ œ๊ฑฐํ•˜๋Š” ๋ฐฉ์‹์œผ๋กœ, Two Pointers ํŒจํ„ด์— ์†ํ•ฉ๋‹ˆ๋‹ค.

๐Ÿ“Š ์‹œ๊ฐ„/๊ณต๊ฐ„ ๋ณต์žก๋„ ๋ถ„์„

โ„น๏ธ ์ด ํŒŒ์ผ์—๋Š” 2๊ฐ€์ง€ ํ’€์ด๊ฐ€ ํฌํ•จ๋˜์–ด ์žˆ์–ด ๊ฐ๊ฐ ๋ถ„์„ํ•ฉ๋‹ˆ๋‹ค.

ํ’€์ด 1: Solution.removeNthFromEnd โ€” Time: O(n) / Space: O(1)
๋ณต์žก๋„
Time O(n)
Space O(1)

ํ”ผ๋“œ๋ฐฑ: ๋น ๋ฅธ ํฌ์ธํ„ฐ๋ฅผ n๋งŒํผ ์ด๋™์‹œํ‚จ ํ›„, ๋А๋ฆฐ ํฌ์ธํ„ฐ์™€ ํ•จ๊ป˜ ์ด๋™ํ•˜๋ฉฐ ๋์—์„œ n๋ฒˆ์งธ ๋…ธ๋“œ๋ฅผ ์ฐพ์Šต๋‹ˆ๋‹ค. ๋ฆฌ์ŠคํŠธ ๊ธธ์ด๋งŒํผ ํ•œ ๋ฒˆ ์ˆœํšŒํ•˜๋ฏ€๋กœ ์‹œ๊ฐ„ ๋ณต์žก๋„๋Š” O(n), ์ถ”๊ฐ€ ๊ณต๊ฐ„์€ ์ƒ์ˆ˜์ž…๋‹ˆ๋‹ค.

๊ฐœ์„  ์ œ์•ˆ: ํ˜„์žฌ ๊ตฌํ˜„์ด ์ ์ ˆํ•ด ๋ณด์ž…๋‹ˆ๋‹ค.

ํ’€์ด 2: Solution.removeNthFromEnd โ€” Time: O(n) / Space: O(1)
๋ณต์žก๋„
Time O(n)
Space O(1)

ํ”ผ๋“œ๋ฐฑ: ๋ฆฌ์ŠคํŠธ ๊ธธ์ด๋ฅผ ๋จผ์ € ๊ณ„์‚ฐํ•˜๊ณ , ๊ทธ ํ›„ ์ œ๊ฑฐ ์œ„์น˜๋ฅผ ์ฐพ๊ธฐ ์œ„ํ•ด ํ•œ ๋ฒˆ ๋” ์ˆœํšŒํ•ฉ๋‹ˆ๋‹ค. ๋‘ ๋ฒˆ ์ˆœํšŒ์ง€๋งŒ ์‹œ๊ฐ„ ๋ณต์žก๋„๋Š” O(n)์ด๊ณ , ๊ณต๊ฐ„์€ ์ƒ์ˆ˜์ž…๋‹ˆ๋‹ค.

๊ฐœ์„  ์ œ์•ˆ: ํ˜„์žฌ ๊ตฌํ˜„์ด ์ ์ ˆํ•ด ๋ณด์ž…๋‹ˆ๋‹ค.

๐Ÿ’ก ํ’€์ด์— ์‹œ๊ฐ„/๊ณต๊ฐ„ ๋ณต์žก๋„๋ฅผ ์ฃผ์„์œผ๋กœ ๋‚จ๊ฒจ๋ณด์„ธ์š”!

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๐Ÿท๏ธ ์•Œ๊ณ ๋ฆฌ์ฆ˜ ํŒจํ„ด ๋ถ„์„

  • ํŒจํ„ด: DFS, BFS
  • ์„ค๋ช…: ์ด ์ฝ”๋“œ๋Š” ์žฌ๊ท€๋ฅผ ์ด์šฉํ•œ DFS์™€ ๋ฐ˜๋ณต๋ฌธ์„ ์ด์šฉํ•œ BFS ๋‘ ๊ฐ€์ง€ ๋ฐฉ๋ฒ•์œผ๋กœ ํŠธ๋ฆฌ์˜ ๋…ธ๋“œ๋“ค์„ ์ˆœํšŒํ•˜๋ฉฐ ๋น„๊ตํ•ฉ๋‹ˆ๋‹ค. ๋‘ ํŒจํ„ด ๋ชจ๋‘ ํŠธ๋ฆฌ ๊ตฌ์กฐ ํƒ์ƒ‰์— ์ ํ•ฉํ•ฉ๋‹ˆ๋‹ค.

๐Ÿ“Š ์‹œ๊ฐ„/๊ณต๊ฐ„ ๋ณต์žก๋„ ๋ถ„์„

โ„น๏ธ ์ด ํŒŒ์ผ์—๋Š” 2๊ฐ€์ง€ ํ’€์ด๊ฐ€ ํฌํ•จ๋˜์–ด ์žˆ์–ด ๊ฐ๊ฐ ๋ถ„์„ํ•ฉ๋‹ˆ๋‹ค.

ํ’€์ด 1: Solution.isSameTree โ€” Time: โœ… O(n) โ†’ O(n) / Space: โœ… O(h) โ†’ O(h)
์œ ์ € ๋ถ„์„ ์‹ค์ œ ๋ถ„์„ ๊ฒฐ๊ณผ
Time O(n) O(n) โœ…
Space O(h) O(h) โœ…

ํ”ผ๋“œ๋ฐฑ: ๋ชจ๋“  ๋…ธ๋“œ๋ฅผ ํ•œ ๋ฒˆ์”ฉ ๋ฐฉ๋ฌธํ•˜๋ฏ€๋กœ ์‹œ๊ฐ„ ๋ณต์žก๋„๋Š” O(n). ์žฌ๊ท€ ํ˜ธ์ถœ๋กœ ์ธํ•ด ํ˜ธ์ถœ ์Šคํƒ์ด ํŠธ๋ฆฌ ๋†’์ด๋งŒํผ ์Œ“์ด๋ฏ€๋กœ ๊ณต๊ฐ„ ๋ณต์žก๋„๋Š” O(h) (h๋Š” ํŠธ๋ฆฌ์˜ ๋†’์ด)์ž…๋‹ˆ๋‹ค.

๊ฐœ์„  ์ œ์•ˆ: ํ˜„์žฌ ๊ตฌํ˜„์ด ์ ์ ˆํ•ด ๋ณด์ž…๋‹ˆ๋‹ค.

ํ’€์ด 2: Solution.isSameTree โ€” Time: โœ… O(n) โ†’ O(n) / Space: โœ… O(n) โ†’ O(n)
์œ ์ € ๋ถ„์„ ์‹ค์ œ ๋ถ„์„ ๊ฒฐ๊ณผ
Time O(n) O(n) โœ…
Space O(n) O(n) โœ…

ํ”ผ๋“œ๋ฐฑ: ๋ชจ๋“  ๋…ธ๋“œ๋ฅผ ํ•œ ๋ฒˆ์”ฉ ๋ฐฉ๋ฌธํ•˜๋ฏ€๋กœ ์‹œ๊ฐ„ ๋ณต์žก๋„๋Š” O(n). ํ๋ฅผ ์‚ฌ์šฉํ•˜๋Š”๋ฐ, ์ตœ์•…์˜ ๊ฒฝ์šฐ ๋ชจ๋“  ๋…ธ๋“œ๊ฐ€ ํ์— ์ €์žฅ๋˜๋ฏ€๋กœ ๊ณต๊ฐ„ ๋ณต์žก๋„๋Š” O(n)์ž…๋‹ˆ๋‹ค.

๊ฐœ์„  ์ œ์•ˆ: ํ˜„์žฌ ๊ตฌํ˜„์ด ์ ์ ˆํ•ด ๋ณด์ž…๋‹ˆ๋‹ค.

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๐Ÿท๏ธ ์•Œ๊ณ ๋ฆฌ์ฆ˜ ํŒจํ„ด ๋ถ„์„

  • ํŒจํ„ด: DFS
  • ์„ค๋ช…: ์ด ์ฝ”๋“œ๋Š” ์žฌ๊ท€์  ๋ฐฉ์‹์œผ๋กœ ํŠธ๋ฆฌ ๊ตฌ์กฐ๋ฅผ ์ง๋ ฌํ™”์™€ ์—ญ์ง๋ ฌํ™”ํ•˜๋Š”๋ฐ, DFS(๊นŠ์ด ์šฐ์„  ํƒ์ƒ‰) ํŒจํ„ด์„ ํ™œ์šฉํ•˜์—ฌ ํŠธ๋ฆฌ์˜ ๋ชจ๋“  ๋…ธ๋“œ๋ฅผ ๋ฐฉ๋ฌธํ•ฉ๋‹ˆ๋‹ค.

๐Ÿ“Š ์‹œ๊ฐ„/๊ณต๊ฐ„ ๋ณต์žก๋„ ๋ถ„์„

โ„น๏ธ ์ด ํŒŒ์ผ์—๋Š” 2๊ฐ€์ง€ ํ’€์ด๊ฐ€ ํฌํ•จ๋˜์–ด ์žˆ์–ด ๊ฐ๊ฐ ๋ถ„์„ํ•ฉ๋‹ˆ๋‹ค.

ํ’€์ด 1: Codec.serialize โ€” Time: O(n) / Space: O(n)
๋ณต์žก๋„
Time O(n)
Space O(n)

ํ”ผ๋“œ๋ฐฑ: ๋ชจ๋“  ๋…ธ๋“œ๋ฅผ ํ•œ ๋ฒˆ์”ฉ ๋ฐฉ๋ฌธํ•˜์—ฌ ๋ฌธ์ž์—ด๋กœ ๋ณ€ํ™˜ํ•˜๋ฏ€๋กœ ์‹œ๊ฐ„ ๋ณต์žก๋„๋Š” O(n). ์žฌ๊ท€ ํ˜ธ์ถœ๋กœ ์ธํ•œ ํ˜ธ์ถœ ์Šคํƒ๊ณผ ๊ฒฐ๊ณผ ๋ฌธ์ž์—ด ํฌ๊ธฐ ๋•Œ๋ฌธ์— ๊ณต๊ฐ„ ๋ณต์žก๋„๋„ O(n)์ž…๋‹ˆ๋‹ค.

๊ฐœ์„  ์ œ์•ˆ: ํ˜„์žฌ ๊ตฌํ˜„์ด ์ ์ ˆํ•ด ๋ณด์ž…๋‹ˆ๋‹ค.

ํ’€์ด 2: Codec.deserialize โ€” Time: O(n) / Space: O(n)
๋ณต์žก๋„
Time O(n)
Space O(n)

ํ”ผ๋“œ๋ฐฑ: ์ž…๋ ฅ ๋ฌธ์ž์—ด์„ ๋ฐฐ์—ด๋กœ ๋ถ„ํ•  ํ›„, ์žฌ๊ท€์ ์œผ๋กœ ๋…ธ๋“œ๋ฅผ ์žฌ๊ตฌ์„ฑํ•˜๋ฏ€๋กœ ์‹œ๊ฐ„ ๋ณต์žก๋„๋Š” O(n). ๋ฐฐ์—ด ํฌ๊ธฐ๋งŒํผ ํ˜ธ์ถœ ์Šคํƒ์ด ์Œ“์ด๋ฏ€๋กœ ๊ณต๊ฐ„ ๋ณต์žก๋„๋„ O(n)์ž…๋‹ˆ๋‹ค.

๊ฐœ์„  ์ œ์•ˆ: ํ˜„์žฌ ๊ตฌํ˜„์ด ์ ์ ˆํ•ด ๋ณด์ž…๋‹ˆ๋‹ค.

๐Ÿ’ก ํ’€์ด์— ์‹œ๊ฐ„/๊ณต๊ฐ„ ๋ณต์žก๋„๋ฅผ ์ฃผ์„์œผ๋กœ ๋‚จ๊ฒจ๋ณด์„ธ์š”!

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