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[hwi-middle] WEEK 14 solutions#2625

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@hwi-middle hwi-middle commented Jun 3, 2026 •
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๋‹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”.

@github-actions github-actions Bot added the c++ label Jun 3, 2026
dalestudy[bot]
dalestudy Bot reviewed Jun 3, 2026
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Comment thread binary-tree-level-order-traversal/hwi-middle.cpp
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๐Ÿท๏ธ ์•Œ๊ณ ๋ฆฌ์ฆ˜ ํŒจํ„ด ๋ถ„์„

  • ํŒจํ„ด: BFS
  • ์„ค๋ช…: ์ด ์ฝ”๋“œ๋Š” ํ๋ฅผ ์ด์šฉํ•œ ๋„ˆ๋น„ ์šฐ์„  ํƒ์ƒ‰(BFS)๋กœ ํŠธ๋ฆฌ์˜ ๊ฐ ๋ ˆ๋ฒจ์„ ์ˆœํšŒํ•˜๋ฉฐ ๊ฒฐ๊ณผ๋ฅผ ์ €์žฅํ•ฉ๋‹ˆ๋‹ค. ๋ ˆ๋ฒจ๋ณ„ ๋…ธ๋“œ ๋ฐฉ๋ฌธ์— ์ ํ•ฉํ•œ ํŒจํ„ด์ž…๋‹ˆ๋‹ค.

๐Ÿ“Š ์‹œ๊ฐ„/๊ณต๊ฐ„ ๋ณต์žก๋„ ๋ถ„์„

๋ณต์žก๋„
Time O(n)
Space O(n)

ํ”ผ๋“œ๋ฐฑ: ํ๋ฅผ ์ด์šฉํ•œ BFS๋กœ ๋ชจ๋“  ๋…ธ๋“œ๋ฅผ ํ•œ ๋ฒˆ์”ฉ ๋ฐฉ๋ฌธํ•˜๋ฏ€๋กœ ์‹œ๊ฐ„ ๋ณต์žก๋„๋Š” O(n). ํ์™€ ๊ฒฐ๊ณผ ๋ฒกํ„ฐ์— ๋…ธ๋“œ ์ˆ˜๋งŒํผ ์ €์žฅํ•˜๋ฏ€๋กœ ๊ณต๊ฐ„ ๋ณต์žก๋„๋„ O(n).

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

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

dalestudy[bot]
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Comment thread counting-bits/hwi-middle.cpp
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๐Ÿท๏ธ ์•Œ๊ณ ๋ฆฌ์ฆ˜ ํŒจํ„ด ๋ถ„์„

  • ํŒจํ„ด: Bit Manipulation
  • ์„ค๋ช…: ์ด ์ฝ”๋“œ๋Š” ๋น„ํŠธ ์กฐ์ž‘ ๊ธฐ๋ฒ•์ธ i & (i - 1)์„ ์ด์šฉํ•˜์—ฌ ๊ฐ ์ˆซ์ž์˜ 1 ๋น„ํŠธ ๊ฐœ์ˆ˜๋ฅผ ๊ณ„์‚ฐํ•˜๋Š” ๋น„ํŠธ ์กฐ์ž‘ ํŒจํ„ด์„ ์‚ฌ์šฉํ•ฉ๋‹ˆ๋‹ค.

๐Ÿ“Š ์‹œ๊ฐ„/๊ณต๊ฐ„ ๋ณต์žก๋„ ๋ถ„์„

๋ณต์žก๋„
Time O(n)
Space O(n)

ํ”ผ๋“œ๋ฐฑ: DP๋ฅผ ํ™œ์šฉํ•˜์—ฌ i & (i - 1) ์—ฐ์‚ฐ์œผ๋กœ ์ด์ „ ๊ฐ’์— 1์„ ๋”ํ•˜๋Š” ๋ฐฉ์‹์œผ๋กœ ๊ณ„์‚ฐ, ๋ชจ๋“  ์ˆ˜์— ๋Œ€ํ•ด ํ•œ ๋ฒˆ์”ฉ ๊ณ„์‚ฐํ•˜๋ฏ€๋กœ ์‹œ๊ฐ„ ๋ณต์žก๋„๋Š” O(n). ๋ฐฐ์—ด ํฌ๊ธฐ๋งŒํผ ์ €์žฅํ•˜๋ฏ€๋กœ ๊ณต๊ฐ„๋„ O(n).

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

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

dalestudy[bot]
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Comment thread find-median-from-data-stream/hwi-middle.cpp
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๐Ÿท๏ธ ์•Œ๊ณ ๋ฆฌ์ฆ˜ ํŒจํ„ด ๋ถ„์„

  • ํŒจํ„ด: Heap / Priority Queue
  • ์„ค๋ช…: ์ด ์ฝ”๋“œ๋Š” ๋‘ ๊ฐœ์˜ ํž™์„ ์ด์šฉํ•˜์—ฌ ์‹ค์‹œ๊ฐ„์œผ๋กœ ์ค‘์•™๊ฐ’์„ ์ฐพ๋Š” ๋ฐฉ์‹์œผ๋กœ, ์šฐ์„ ์ˆœ์œ„ ํ(ํž™)๋ฅผ ํ™œ์šฉํ•˜๋Š” ํŒจํ„ด์— ์†ํ•ฉ๋‹ˆ๋‹ค. ํž™์„ ํ†ตํ•ด ๋ฐ์ดํ„ฐ์˜ ์ค‘์•™๊ฐ’์„ ํšจ์œจ์ ์œผ๋กœ ์œ ์ง€ํ•ฉ๋‹ˆ๋‹ค.

๐Ÿ“Š ์‹œ๊ฐ„/๊ณต๊ฐ„ ๋ณต์žก๋„ ๋ถ„์„

๋ณต์žก๋„
Time O(log n)
Space O(n)

ํ”ผ๋“œ๋ฐฑ: ํž™์„ ์ด์šฉํ•œ ๊ท ํ˜• ์œ ์ง€๋กœ ์‚ฝ์ž…๊ณผ ์กฐํšŒ ๋ชจ๋‘ O(log n). ๊ณต๊ฐ„์€ ์ €์žฅ๋œ ์ˆซ์ž ๊ฐœ์ˆ˜์— ๋น„๋ก€ํ•˜์—ฌ O(n).

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

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

dalestudy[bot]
dalestudy Bot reviewed Jun 3, 2026
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Comment thread house-robber-ii/hwi-middle.cpp
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๐Ÿท๏ธ ์•Œ๊ณ ๋ฆฌ์ฆ˜ ํŒจํ„ด ๋ถ„์„

  • ํŒจํ„ด: Dynamic Programming
  • ์„ค๋ช…: ์ด ์ฝ”๋“œ๋Š” ์›ํ˜• ๋ฐฐ์—ด์—์„œ ์—ฐ์†๋œ ์ง‘์„ ํ„ธ ๋•Œ, ์ตœ์ ์˜ ํ•ด๋ฅผ ์ฐพ๊ธฐ ์œ„ํ•ด DP ๋ฐฉ์‹์„ ์‚ฌ์šฉํ•ฉ๋‹ˆ๋‹ค. ์ด์ „ ์ƒํƒœ๋ฅผ ๊ธฐ๋ฐ˜์œผ๋กœ ์ตœ๋Œ“๊ฐ’์„ ๊ณ„์‚ฐํ•˜๋Š” ๋ฐฉ์‹์ด ํŠน์ง•์ž…๋‹ˆ๋‹ค.

๐Ÿ“Š ์‹œ๊ฐ„/๊ณต๊ฐ„ ๋ณต์žก๋„ ๋ถ„์„

๋ณต์žก๋„
Time O(n)
Space O(n)

ํ”ผ๋“œ๋ฐฑ: ๋‘ ๊ฐœ์˜ ์„ ํ˜• ๋ฌธ์ œ๋กœ ๋‚˜๋ˆ„์–ด DP ๊ณ„์‚ฐ, ๊ฐ๊ฐ O(n). ์ „์ฒด ์‹œ๊ฐ„์€ O(n). ๊ณต๊ฐ„๋„ DP ๋ฐฐ์—ด ํฌ๊ธฐ๋งŒํผ ์‚ฌ์šฉ.

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

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

@hwi-middle hwi-middle closed this Jun 3, 2026
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