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[sangbeenmoon] WEEK 07 solutions#2551

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[sangbeenmoon] WEEK 07 solutions#2551
sangbeenmoon wants to merge 4 commits intoDaleStudy:mainfrom
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@sangbeenmoon sangbeenmoon commented Apr 18, 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 py label Apr 18, 2026
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Comment thread longest-substring-without-repeating-characters/sangbeenmoon.py
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๐Ÿท๏ธ ์•Œ๊ณ ๋ฆฌ์ฆ˜ ํŒจํ„ด ๋ถ„์„

  • ํŒจํ„ด: Sliding Window, Hash Map / Hash Set
  • ์„ค๋ช…: ์ด ์ฝ”๋“œ๋Š” ์—ฐ์†๋œ ๋ถ€๋ถ„ ๋ฌธ์ž์—ด์„ ์ฐพ๊ธฐ ์œ„ํ•ด ์Šฌ๋ผ์ด๋”ฉ ์œˆ๋„์šฐ ๊ธฐ๋ฒ•์„ ์‚ฌ์šฉํ•˜๋ฉฐ, ๋ฌธ์ž ์œ„์น˜๋ฅผ ์ถ”์ ํ•˜๊ธฐ ์œ„ํ•ด ํ•ด์‹œ ๋งต์„ ํ™œ์šฉํ•ฉ๋‹ˆ๋‹ค. ์ด๋ฅผ ํ†ตํ•ด ๋ฐ˜๋ณต ์—†๋Š” ์ตœ๋Œ€ ๊ธธ์ด๋ฅผ ํšจ์œจ์ ์œผ๋กœ ๊ณ„์‚ฐํ•ฉ๋‹ˆ๋‹ค.

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Comment thread number-of-islands/sangbeenmoon.py
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๐Ÿท๏ธ ์•Œ๊ณ ๋ฆฌ์ฆ˜ ํŒจํ„ด ๋ถ„์„

  • ํŒจํ„ด: DFS
  • ์„ค๋ช…: ์ด ์ฝ”๋“œ๋Š” ์žฌ๊ท€ ํ˜ธ์ถœ์„ ํ†ตํ•ด ์ธ์ ‘ํ•œ ์„ฌ์„ ํƒ์ƒ‰ํ•˜๋Š” DFS(๊นŠ์ด ์šฐ์„  ํƒ์ƒ‰) ๋ฐฉ์‹์„ ์‚ฌ์šฉํ•˜์—ฌ ์„ฌ์˜ ๊ฐœ์ˆ˜๋ฅผ ์…‰๋‹ˆ๋‹ค. ๋ฐฉ๋ฌธ ์ฒดํฌ์™€ ์žฌ๊ท€์  ํƒ์ƒ‰์ด ํ•ต์‹ฌ์ž…๋‹ˆ๋‹ค.

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๐Ÿท๏ธ ์•Œ๊ณ ๋ฆฌ์ฆ˜ ํŒจํ„ด ๋ถ„์„

  • ํŒจํ„ด: Linked List
  • ์„ค๋ช…: ์ด ์ฝ”๋“œ๋Š” ์—ฐ๊ฒฐ ๋ฆฌ์ŠคํŠธ๋ฅผ ์—ญ์ˆœ์œผ๋กœ ๋’ค์ง‘๋Š” ๋ฌธ์ œ๋กœ, ๋ฆฌ์ŠคํŠธ ๋…ธ๋“œ์˜ ํฌ์ธํ„ฐ๋ฅผ ์กฐ์ž‘ํ•˜๋Š” ๋ฐฉ์‹์ด ํŠน์ง•์ž…๋‹ˆ๋‹ค. ์ฃผ์–ด์ง„ ํŒจํ„ด ๋ชฉ๋ก์— ์—†์ง€๋งŒ, ์—ฐ๊ฒฐ ๋ฆฌ์ŠคํŠธ ๊ด€๋ จ ๋Œ€ํ‘œ์ ์ธ ํŒจํ„ด์ž…๋‹ˆ๋‹ค.

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๐Ÿท๏ธ ์•Œ๊ณ ๋ฆฌ์ฆ˜ ํŒจํ„ด ๋ถ„์„

  • ํŒจํ„ด: Hash Map / Hash Set
  • ์„ค๋ช…: ์ด ์ฝ”๋“œ๋Š” ํ–‰๊ณผ ์—ด์— 0์ด ์žˆ๋Š” ์œ„์น˜๋ฅผ ๊ธฐ๋กํ•˜๊ธฐ ์œ„ํ•ด ํ•ด์‹œ ๋งต์„ ์‚ฌ์šฉํ•˜์—ฌ, ์ดํ›„์— ํ•ด๋‹น ์œ„์น˜๋ฅผ 0์œผ๋กœ ๋ณ€๊ฒฝํ•˜๋Š” ๋ฐฉ์‹์œผ๋กœ ๋ฌธ์ œ๋ฅผ ํ•ด๊ฒฐํ•ฉ๋‹ˆ๋‹ค.

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๐Ÿท๏ธ ์•Œ๊ณ ๋ฆฌ์ฆ˜ ํŒจํ„ด ๋ถ„์„

  • ํŒจํ„ด: Dynamic Programming
  • ์„ค๋ช…: ์ด ์ฝ”๋“œ๋Š” 2์ฐจ์› DP ๋ฐฐ์—ด์„ ์ด์šฉํ•˜์—ฌ ๊ฒฝ๋กœ์˜ ์ˆ˜๋ฅผ ๊ณ„์‚ฐํ•˜๋Š” ๋ฐฉ์‹์œผ๋กœ, ์ด์ „ ์ƒํƒœ๋ฅผ ๊ธฐ๋ฐ˜์œผ๋กœ ํ˜„์žฌ ๊ฐ’์„ ๊ฐฑ์‹ ํ•˜๋Š” DP ํŒจํ„ด์— ์†ํ•ฉ๋‹ˆ๋‹ค.

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dalestudy bot commented Apr 18, 2026

๐Ÿ“Š sangbeenmoon ๋‹˜์˜ ํ•™์Šต ํ˜„ํ™ฉ

์ด๋ฒˆ ์ฃผ ์ œ์ถœ ๋ฌธ์ œ

๋ฌธ์ œ ๋‚œ์ด๋„ ์œ ํ˜• ๋ถ„์„
longest-substring-without-repeating-characters Medium โœ… ์˜๋„ํ•œ ์œ ํ˜•
number-of-islands Medium โš ๏ธ ์œ ํ˜• ๋ถˆ์ผ์น˜
reverse-linked-list Easy โš ๏ธ ์œ ํ˜• ๋ถˆ์ผ์น˜
set-matrix-zeroes Medium โš ๏ธ ์œ ํ˜• ๋ถˆ์ผ์น˜
unique-paths Medium โœ… ์˜๋„ํ•œ ์œ ํ˜•

๋ˆ„์  ํ•™์Šต ์š”์•ฝ

  • ํ’€์ดํ•œ ๋ฌธ์ œ: 28 / 75๊ฐœ
  • ์ด๋ฒˆ ์ฃผ ์œ ํ˜• ์ผ์น˜์œจ: 40% (5๋ฌธ์ œ ์ค‘ 2๋ฌธ์ œ ์ผ์น˜)

๋ฌธ์ œ ํ’€์ด ํ˜„ํ™ฉ

์นดํ…Œ๊ณ ๋ฆฌ ์ง„ํ–‰๋„ ์™„๋ฃŒ
Bucket Sort โ– โ– โ– โ– โ– โ– โ–  1 / 1 (Medium 1)
Counting โ– โ– โ– โ– โ– โ– โ–  1 / 1 (Medium 1)
Memoization โ– โ– โ– โ– โ– โ– โ–  2 / 2 (Easy 1, Medium 1)
Quickselect โ– โ– โ– โ– โ– โ– โ–  1 / 1 (Medium 1)
Simulation โ– โ– โ– โ– โ– โ– โ–  1 / 1 (Medium 1)
Trie โ– โ– โ– โ– โ– โ–กโ–ก 3 / 4 (Medium 3)
Backtracking โ– โ– โ– โ– โ– โ–กโ–ก 2 / 3 (Medium 2)
Design โ– โ– โ– โ– โ–กโ–กโ–ก 3 / 5 (Medium 3)
Array โ– โ– โ– โ– โ–กโ–กโ–ก 18 / 36 (Medium 15, Easy 3)
Binary Search โ– โ– โ– โ– โ–กโ–กโ–ก 2 / 4 (Medium 2)
Divide and Conquer โ– โ– โ– โ– โ–กโ–กโ–ก 3 / 6 (Medium 2, Easy 1)
Hash Table โ– โ– โ– โ– โ–กโ–กโ–ก 8 / 16 (Easy 3, Medium 5)
Prefix Sum โ– โ– โ– โ– โ–กโ–กโ–ก 1 / 2 (Medium 1)
String โ– โ– โ– โ–กโ–กโ–กโ–ก 9 / 19 (Medium 7, Easy 2)
Sorting โ– โ– โ– โ–กโ–กโ–กโ–ก 5 / 11 (Medium 3, Easy 2)
Dynamic Programming โ– โ– โ– โ–กโ–กโ–กโ–ก 8 / 18 (Easy 2, Medium 6)
Binary Search Tree โ– โ– โ–กโ–กโ–กโ–กโ–ก 1 / 3 (Medium 1)
Recursion โ– โ– โ–กโ–กโ–กโ–กโ–ก 1 / 3 (Easy 1)
Matrix โ– โ– โ–กโ–กโ–กโ–กโ–ก 2 / 7 (Medium 2)
Heap (Priority Queue) โ– โ– โ–กโ–กโ–กโ–กโ–ก 1 / 4 (Medium 1)
Union-Find โ– โ– โ–กโ–กโ–กโ–กโ–ก 1 / 4 (Medium 1)
Depth-First Search โ– โ– โ–กโ–กโ–กโ–กโ–ก 4 / 18 (Medium 3, Easy 1)
Bit Manipulation โ– โ–กโ–กโ–กโ–กโ–กโ–ก 1 / 5 (Easy 1)
Math โ– โ–กโ–กโ–กโ–กโ–กโ–ก 1 / 5 (Easy 1)
Two Pointers โ– โ–กโ–กโ–กโ–กโ–กโ–ก 2 / 10 (Medium 1, Easy 1)
Binary Tree โ– โ–กโ–กโ–กโ–กโ–กโ–ก 2 / 11 (Easy 1, Medium 1)
Tree โ– โ–กโ–กโ–กโ–กโ–กโ–ก 2 / 11 (Easy 1, Medium 1)
Linked List โ– โ–กโ–กโ–กโ–กโ–กโ–ก 1 / 6 (Easy 1)
Breadth-First Search โ– โ–กโ–กโ–กโ–กโ–กโ–ก 2 / 13 (Medium 1, Easy 1)
Combinatorics โ–กโ–กโ–กโ–กโ–กโ–กโ–ก 0 / 1 โ† ์•„์ง ์‹œ์ž‘ ์•ˆ ํ•จ
Data Stream โ–กโ–กโ–กโ–กโ–กโ–กโ–ก 0 / 1 โ† ์•„์ง ์‹œ์ž‘ ์•ˆ ํ•จ
Graph Theory โ–กโ–กโ–กโ–กโ–กโ–กโ–ก 0 / 5 โ† ์•„์ง ์‹œ์ž‘ ์•ˆ ํ•จ
Greedy โ–กโ–กโ–กโ–กโ–กโ–กโ–ก 0 / 4 โ† ์•„์ง ์‹œ์ž‘ ์•ˆ ํ•จ
Hash Function โ–กโ–กโ–กโ–กโ–กโ–กโ–ก 0 / 1 โ† ์•„์ง ์‹œ์ž‘ ์•ˆ ํ•จ
Merge Sort โ–กโ–กโ–กโ–กโ–กโ–กโ–ก 0 / 1 โ† ์•„์ง ์‹œ์ž‘ ์•ˆ ํ•จ
Sliding Window โ–กโ–กโ–กโ–กโ–กโ–กโ–ก 0 / 3 โ† ์•„์ง ์‹œ์ž‘ ์•ˆ ํ•จ
Stack โ–กโ–กโ–กโ–กโ–กโ–กโ–ก 0 / 2 โ† ์•„์ง ์‹œ์ž‘ ์•ˆ ํ•จ
String Matching โ–กโ–กโ–กโ–กโ–กโ–กโ–ก 0 / 1 โ† ์•„์ง ์‹œ์ž‘ ์•ˆ ํ•จ
Topological Sort โ–กโ–กโ–กโ–กโ–กโ–กโ–ก 0 / 2 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 1,803 166 1,969 $0.000247

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dalestudy bot commented Apr 18, 2026

๐Ÿ“Š ์‹œ๊ฐ„/๊ณต๊ฐ„ ๋ณต์žก๋„ ๋ถ„์„

longest-substring-without-repeating-characters

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

ํ”ผ๋“œ๋ฐฑ: ์ด ๊ตฌํ˜„์€ ์Šฌ๋ผ์ด๋”ฉ ์œˆ๋„์šฐ์™€ ํ•ด์‹œ๋งต์„ ์ด์šฉํ•˜์—ฌ ์ค‘๋ณต ๋ฌธ์ž๋ฅผ ๋น ๋ฅด๊ฒŒ ์ฐพ๊ณ  ์œˆ๋„์šฐ ํฌ๊ธฐ๋ฅผ ์กฐ์ ˆํ•˜๋Š” ํšจ์œจ์ ์ธ ๋ฐฉ๋ฒ•์ž…๋‹ˆ๋‹ค. ์‹œ๊ฐ„๋ณต์žก๋„์™€ ๊ณต๊ฐ„๋ณต์žก๋„ ๋ชจ๋‘ ์ ์ ˆํ•˜๊ฒŒ ์ตœ์ ํ™”๋˜์–ด ์žˆ์Šต๋‹ˆ๋‹ค.

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

number-of-islands

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

ํ”ผ๋“œ๋ฐฑ: DFS๋ฅผ ์ด์šฉํ•œ ์„ฌ ํƒ์ƒ‰ ๋ฐฉ๋ฒ•์œผ๋กœ, ๋ชจ๋“  ์…€์„ ํ•œ ๋ฒˆ์”ฉ ๋ฐฉ๋ฌธํ•˜๋ฉฐ ์„ฌ์„ ์…ˆํ•˜๋Š” ๋ฐฉ์‹์ž…๋‹ˆ๋‹ค. ์‹œ๊ฐ„๊ณผ ๊ณต๊ฐ„ ๋ณต์žก๋„ ๋ชจ๋‘ ์ ์ ˆํ•˜๊ฒŒ ๊ตฌํ˜„๋˜์–ด ์žˆ์Šต๋‹ˆ๋‹ค.

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

reverse-linked-list

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

ํ”ผ๋“œ๋ฐฑ: ์ด ๋ฐฉ์‹์€ ์ƒˆ ๋…ธ๋“œ๋ฅผ ๋งŒ๋“ค์–ด ์—ญ์ˆœ์œผ๋กœ ์—ฐ๊ฒฐํ•˜๋Š” ๋ฐฉ๋ฒ•์œผ๋กœ, ์‹œ๊ฐ„๋ณต์žก๋„๋Š” ์„ ํ˜•์ด๊ณ  ๊ณต๊ฐ„๋ณต์žก๋„๋„ ๋…ธ๋“œ ์ˆ˜๋งŒํผ ํ•„์š”ํ•ฉ๋‹ˆ๋‹ค. ๊ทธ๋Ÿฌ๋‚˜ ๊ธฐ์กด ๋…ธ๋“œ๋ฅผ ์žฌํ™œ์šฉํ•˜๋Š” ๋ฐฉ๋ฒ•์ด ๋” ๊ณต๊ฐ„ ํšจ์œจ์ ์ผ ์ˆ˜ ์žˆ์Šต๋‹ˆ๋‹ค.

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

set-matrix-zeroes

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

ํ”ผ๋“œ๋ฐฑ: ์ด ๋ฐฉ๋ฒ•์€ ํ–‰๊ณผ ์—ด์„ ๋ณ„๋„ ๋”•์…”๋„ˆ๋ฆฌ๋กœ ๊ธฐ๋กํ•˜์—ฌ, ์ดํ›„์— ๋‹ค์‹œ 0์œผ๋กœ ์ฑ„์šฐ๋Š” ๋ฐฉ์‹์ž…๋‹ˆ๋‹ค. ์‹œ๊ฐ„๋ณต์žก๋„๋Š” ์ด์ค‘ ๋ฃจํ”„๋กœ ์ถฉ๋ถ„ํžˆ ์ตœ์ ํ™”๋˜์–ด ์žˆ์œผ๋ฉฐ, ๊ณต๊ฐ„๋„ ์ ์ ˆํ•ฉ๋‹ˆ๋‹ค.

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

unique-paths

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

ํ”ผ๋“œ๋ฐฑ: ์ด DP ๋ฐฉ์‹์€ ๊ฐ ์…€์— ๋„๋‹ฌํ•˜๋Š” ๊ฒฝ๋กœ ์ˆ˜๋ฅผ ์ด์ „ ์…€์˜ ๊ฐ’์„ ์ด์šฉํ•ด ๊ณ„์‚ฐํ•˜๋Š” ํ‘œ์ค€ ๋ฐฉ๋ฒ•์ž…๋‹ˆ๋‹ค. ์‹œ๊ฐ„๊ณผ ๊ณต๊ฐ„ ๋ชจ๋‘ ์ตœ์ ํ™”๋˜์–ด ์žˆ์Šต๋‹ˆ๋‹ค.

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

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

@sangbeenmoon sangbeenmoon changed the title Week7 [sangbeenmoon] WEEK 07 solutions Apr 18, 2026
@gyeo-ri gyeo-ri self-requested a review April 18, 2026 14:09
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gyeo-ri approved these changes Apr 18, 2026
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5๋ฌธ์ œ ๋ชจ๋‘ ์ œ์ถœํ•˜์…จ๋„ค์š”! ์ด๋ฒˆ์ฃผ๋„ ๊ณ ์ƒ ๋งŽ์œผ์…จ์Šต๋‹ˆ๋‹ค ใ…Žใ…Ž

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