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[liza0525] WEEK 14 Solutions#2629

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[liza0525] WEEK 14 Solutions#2629
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@liza0525
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@liza0525 liza0525 commented Jun 5, 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”.

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๐Ÿท๏ธ ์•Œ๊ณ ๋ฆฌ์ฆ˜ ํŒจํ„ด ๋ถ„์„

  • ํŒจํ„ด: BFS, DFS
  • ์„ค๋ช…: ์ด ์ฝ”๋“œ๋Š” ํŠธ๋ฆฌ์˜ ๋ ˆ๋ฒจ๋ณ„ ์ˆœํšŒ๋ฅผ ์œ„ํ•ด BFS์™€ DFS ๋ฐฉ์‹์„ ๋ชจ๋‘ ์‚ฌ์šฉํ•˜๋ฉฐ, ๊ฐ๊ฐ ํ์™€ ์žฌ๊ท€ ํ˜ธ์ถœ์„ ํ™œ์šฉํ•˜๋Š” ๋Œ€ํ‘œ์ ์ธ ํŠธ๋ฆฌ ํƒ์ƒ‰ ํŒจํ„ด์ž…๋‹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.levelOrder โ€” Time: โœ… O(n) โ†’ O(n) / Space: โœ… O(w) โ†’ O(w)
์œ ์ € ๋ถ„์„ ์‹ค์ œ ๋ถ„์„ ๊ฒฐ๊ณผ
Time O(n) O(n) โœ…
Space O(w) O(w) โœ…

ํ”ผ๋“œ๋ฐฑ: ํ๋ฅผ ์ด์šฉํ•œ BFS ํƒ์ƒ‰์œผ๋กœ ๋ชจ๋“  ๋…ธ๋“œ๋ฅผ ํ•œ ๋ฒˆ์”ฉ ๋ฐฉ๋ฌธํ•˜๋ฉฐ, ์ตœ๋Œ€ ๋…ธ๋“œ ์ˆ˜(w)์— ๋น„๋ก€ํ•˜๋Š” ๊ณต๊ฐ„์„ ์‚ฌ์šฉํ•ฉ๋‹ˆ๋‹ค.

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

ํ’€์ด 2: Solution.levelOrder 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: ์žฌ๊ท€ ํ˜ธ์ถœ ์Šคํƒ์ด ํŠธ๋ฆฌ์˜ ๋†’์ด(h)์— ๋น„๋ก€ํ•˜๋ฉฐ, ๋ชจ๋“  ๋…ธ๋“œ๋ฅผ ํ•œ ๋ฒˆ์”ฉ ๋ฐฉ๋ฌธํ•ฉ๋‹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: Dynamic Programming
  • ์„ค๋ช…: ์ด ์ฝ”๋“œ๋Š” ์ด์ „ ๊ฒฐ๊ณผ๋ฅผ ํ™œ์šฉํ•˜์—ฌ ํ˜„์žฌ ๊ฐ’์„ ๊ณ„์‚ฐํ•˜๋Š” DP ๋ฐฉ์‹์„ ์‚ฌ์šฉํ•˜๋ฉฐ, ์ตœ์ ์˜ ์ค‘๋ณต ๊ณ„์‚ฐ ๋ฐฉ์ง€์™€ ํšจ์œจ์„ฑ์„ ๋ณด์—ฌ์ค๋‹ˆ๋‹ค.

๐Ÿ“Š ์‹œ๊ฐ„/๊ณต๊ฐ„ ๋ณต์žก๋„ ๋ถ„์„

์œ ์ € ๋ถ„์„ ์‹ค์ œ ๋ถ„์„ ๊ฒฐ๊ณผ
Time O(n) O(n) โœ…
Space O(n) O(n) โœ…

ํ”ผ๋“œ๋ฐฑ: DP ๋ฐฐ์—ด์„ ์ด์šฉํ•˜์—ฌ ์ด์ „ ๊ฒฐ๊ณผ๋ฅผ ํ™œ์šฉํ•˜๋ฉฐ, ๋ชจ๋“  ์ˆ˜์— ๋Œ€ํ•ด ํ•œ ๋ฒˆ์”ฉ ๊ณ„์‚ฐํ•ฉ๋‹ˆ๋‹ค.

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

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dalestudy Bot commented Jun 5, 2026

๐Ÿ“Š liza0525 ๋‹˜์˜ ํ•™์Šต ํ˜„ํ™ฉ

์ด๋ฒˆ ์ฃผ ์ œ์ถœ ๋ฌธ์ œ

๋ฌธ์ œ ๋‚œ์ด๋„ ์œ ํ˜• ๋ถ„์„
binary-tree-level-order-traversal Medium โœ… ์˜๋„ํ•œ ์œ ํ˜•
counting-bits Easy โš ๏ธ ์œ ํ˜• ๋ถˆ์ผ์น˜

๋ˆ„์  ํ•™์Šต ์š”์•ฝ

  • ํ’€์ดํ•œ ๋ฌธ์ œ: 65 / 75๊ฐœ
  • ์ด๋ฒˆ ์ฃผ ์œ ํ˜• ์ผ์น˜์œจ: 50% (2๋ฌธ์ œ ์ค‘ 1๋ฌธ์ œ ์ผ์น˜)

๋ฌธ์ œ ํ’€์ด ํ˜„ํ™ฉ

์นดํ…Œ๊ณ ๋ฆฌ ์ง„ํ–‰๋„ ์™„๋ฃŒ
Array โ– โ– โ– โ– โ– โ– โ–  10 / 10 (Medium 7, Easy 3)
Linked List โ– โ– โ– โ– โ– โ– โ–  6 / 6 (Easy 3, Hard 1, Medium 2)
Heap โ– โ– โ– โ– โ– โ– โ–  3 / 3 (Hard 2, Medium 1)
Dynamic Programming โ– โ– โ– โ– โ– โ– โ–ก 10 / 11 (Easy 1, Medium 9)
String โ– โ– โ– โ– โ– โ– โ–ก 9 / 10 (Medium 5, Hard 1, Easy 3)
Graph โ– โ– โ– โ– โ– โ– โ–ก 7 / 8 (Medium 7)
Binary โ– โ– โ– โ– โ– โ– โ–ก 4 / 5 (Easy 3, Medium 1)
Interval โ– โ– โ– โ– โ– โ– โ–ก 4 / 5 (Medium 3, Easy 1)
Matrix โ– โ– โ– โ– โ– โ–กโ–ก 3 / 4 (Medium 3)
Tree โ– โ– โ– โ– โ– โ–กโ–ก 10 / 14 (Hard 2, Medium 5, Easy 3)

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
1 928 71 999 $0.000121

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