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[se6816] WEEK 10 solutions#2280

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se6816 merged 4 commits intoDaleStudy:mainDaleStudy/leetcode-study:mainfrom
se6816:mainse6816/leetcode-study:mainCopy head branch name to clipboard
Jan 17, 2026
Merged

[se6816] WEEK 10 solutions#2280
se6816 merged 4 commits intoDaleStudy:mainDaleStudy/leetcode-study:mainfrom
se6816:mainse6816/leetcode-study:mainCopy head branch name to clipboard

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@se6816 se6816 commented Jan 17, 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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se6816 commented Jan 17, 2026

@DaleStudy ๋ฆฌ๋ทฐํ•ด์ค˜

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dalestudy bot commented Jan 17, 2026

๋จผ์ €, ์—ฌ๋Ÿฌ ๋ฌธ์ œ์— ๋Œ€ํ•ด ๊น”๋”ํ•˜๊ฒŒ ์ฝ”๋“œ๋ฅผ ์ž‘์„ฑํ•˜์…จ๊ณ , ์ ์ ˆํ•œ ์ž๋ฃŒ๊ตฌ์กฐ๋ฅผ ํ™œ์šฉํ•˜์…จ๋„ค์š”! ํŠนํžˆ mergeKLists์—์„œ ์šฐ์„ ์ˆœ์œ„ ํ๋ฅผ ์‚ฌ์šฉํ•œ ์ ‘๊ทผ์€ ํšจ์œจ์ ์ž…๋‹ˆ๋‹ค. ๋‹ค๋งŒ, ๋ช‡ ๊ฐ€์ง€ ๊ฐœ์„  ํฌ์ธํŠธ๋ฅผ ์ œ์•ˆ๋“œ๋ฆฌ๊ฒ ์Šต๋‹ˆ๋‹ค.

  1. ์‹œ๊ฐ„/๊ณต๊ฐ„ ๋ณต์žก๋„ ๋ถ„์„
    ๊ฐ ์†”๋ฃจ์…˜์— ๋Œ€ํ•œ ์‹œ๊ฐ„๊ณผ ๊ณต๊ฐ„ ๋ณต์žก๋„ ๋ถ„์„์ด ํฌํ•จ๋˜๋ฉด ์ข‹๊ฒ ์Šต๋‹ˆ๋‹ค. ์˜ˆ๋ฅผ ๋“ค์–ด, invertTree๋Š” BFS๋กœ ๊ตฌํ˜„๋˜์–ด ์žˆ์œผ๋ฉฐ, TC: O(n), SC: O(n) (์ตœ์•…์˜ ๊ฒฝ์šฐ ํ ํฌ๊ธฐ)์ž„์„ ๋ช…ํ™•ํžˆ ํ‘œ๊ธฐํ•˜๋Š” ๊ฒƒ์ด ์ข‹์Šต๋‹ˆ๋‹ค. search์—์„œ๋Š” ์ด์ง„ ํƒ์ƒ‰์œผ๋กœ TC: O(log n), SC: O(1)๋กœ ๋ถ„์„ํ•  ์ˆ˜ ์žˆ๊ฒ ๋„ค์š”.

  2. invertTree (์ด์ง„ ํŠธ๋ฆฌ ๋ฐ˜์ „)
    ํ˜„์žฌ ํ๋ฅผ ์‚ฌ์šฉํ•˜๋Š” BFS ๋ฐฉ์‹์ž…๋‹ˆ๋‹ค. ์žฌ๊ท€ ๋ฐฉ์‹์— ๋น„ํ•ด ์Šคํƒ ๋˜๋Š” ํ๋ฅผ ์‚ฌ์šฉํ•˜๋Š” ๊ฒƒ์€ ๋ช…ํ™•ํ•˜๊ณ  ์ข‹์ง€๋งŒ, ์žฌ๊ท€ ๋ฒ„์ „๊ณผ ๋น„๊ตํ•ด ๊ฐ€๋…์„ฑ๊ณผ ์Šคํƒ ์˜ค๋ฒ„ํ”Œ๋กœ์šฐ ๊ฐ€๋Šฅ์„ฑ๋„ ๊ณ ๋ คํ•  ์ˆ˜ ์žˆ์Šต๋‹ˆ๋‹ค. ๋˜ํ•œ, ๋ณ€์ˆ˜๋ช… que ๋Œ€์‹  queue๊ฐ€ ๋” ์ง๊ด€์ ์ž…๋‹ˆ๋‹ค.

  3. Jump Game
    DFS ๋ฐฉ์‹์€ ๊ฐ„๋‹จํ•˜์ง€๋งŒ, ์ตœ์•…์˜ ๊ฒฝ์šฐ ์‹œ๊ฐ„ ๋ณต์žก๋„๊ฐ€ ๋†’์•„์งˆ ์ˆ˜ ์žˆ์Šต๋‹ˆ๋‹ค. greedy ์ ‘๊ทผ๋ฒ•์„ ์‚ฌ์šฉํ•˜๋ฉด ๋” ๊น”๋”ํ•˜๊ณ  ํšจ์œจ์ ์ž…๋‹ˆ๋‹ค(TC: O(n)). ์˜ˆ๋ฅผ ๋“ค์–ด, maxReach ๋ณ€์ˆ˜๋กœ ์ตœ๋Œ“๊ฐ’์„ ๊ฐฑ์‹ ํ•˜๋ฉฐ ์ง„ํ–‰ํ•˜๋Š” ๋ฐฉ๋ฒ•์ด ๋” ๊ถŒ์žฅ๋ฉ๋‹ˆ๋‹ค.

  4. Merge K Sorted Lists
    ์šฐ์„ ์ˆœ์œ„ ํ ์‚ฌ์šฉ์€ ํšจ๊ณผ์ ์ž…๋‹ˆ๋‹ค. ํ•˜์ง€๋งŒ ํ˜„์žฌ curr.next = new ListNode(temp.val)์œผ๋กœ ์ƒˆ ๋…ธ๋“œ๋ฅผ ์ƒ์„ฑํ•˜๋Š” ๋Œ€์‹ , ๊ธฐ์กด ๋…ธ๋“œ๋ฅผ ์—ฐ๊ฒฐํ•˜๋Š” ๋ฐฉ์‹์ด ๋” ๋ฉ”๋ชจ๋ฆฌ ํšจ์œจ์ ์ž…๋‹ˆ๋‹ค. ์ฆ‰, curr.next = temp๋กœ ๋ฐ”๋กœ ์—ฐ๊ฒฐํ•˜๋Š” ๊ฒƒ์ด ์ข‹์Šต๋‹ˆ๋‹ค.

  5. Search in Rotated Sorted Array
    ์ด์ง„ ํƒ์ƒ‰ ๊ตฌํ˜„์ด ๊น”๋”ํ•˜๋ฉฐ, ์ฃผ์„์ด๋‚˜ ๋ณ€์ˆ˜๋ช…์— ์กฐ๊ธˆ ๋” ์„ค๋ช…์„ ์ถ”๊ฐ€ํ•˜๋ฉด ๋” ์ข‹๊ฒ ์Šต๋‹ˆ๋‹ค. ์˜ˆ๋ฅผ ๋“ค์–ด, binarySearch ๋ฉ”์„œ๋“œ์— return -1์ด ์˜๋ฏธํ•˜๋Š” ๋ฐ”๋ฅผ ๋ช…ํ™•ํžˆ ํ•ด ์ฃผ์„ธ์š”.

์ „์ฒด์ ์œผ๋กœ ๊ฐ€๋…์„ฑ์ด ์ข‹๊ณ  ๊น”๋”ํ•œ ์ฝ”๋“œ์ž…๋‹ˆ๋‹ค! ๋‹ค์Œ ๋‹จ๊ณ„๋กœ๋Š” ๊ฐ ์†”๋ฃจ์…˜๋ณ„ ๋ณต์žก๋„ ๋ถ„์„์„ ์ถ”๊ฐ€ํ•˜๊ณ , ์ผ๋ถ€ ๊ตฌํ˜„์„ ๋” ํšจ์œจ์ ์ด๊ฑฐ๋‚˜ ๊ฐ„๊ฒฐํ•˜๊ฒŒ ๊ฐœ์„ ํ•˜๋ฉด ๋”์šฑ ์™„์„ฑ๋„ ๋†’์€ PR์ด ๋  ๊ฒƒ ๊ฐ™์Šต๋‹ˆ๋‹ค. ๊ณ„์†ํ•ด์„œ ์ข‹์€ ์ž‘์—… ๊ธฐ๋Œ€ํ•ฉ๋‹ˆ๋‹ค!

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se6816 commented Jan 17, 2026

@DaleStudy approve

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์Šน์ธ๋˜์—ˆ์Šต๋‹ˆ๋‹ค! ๐Ÿ‘

@se6816 se6816 merged commit 8f248e1 into DaleStudy:main Jan 17, 2026
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