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Sik-J/ssangyong-codingtest-study

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<๐Ÿ’ป ์ฝ”๋”ฉํ…Œ์ŠคํŠธ ์•Œ๊ณ ๋ฆฌ์ฆ˜ ์Šคํ„ฐ๋””>



โœ… ์ฐธ์—ฌ ๋ฐฉ๋ฒ•

  1. ์ด ์ €์žฅ์†Œ๋ฅผ fork ํ•œ๋‹ค.
  2. ์ƒ์„ฑ๋œ ์›๊ฒฉ ์ €์žฅ์†Œ์— ์ด๋ฆ„ ํ˜น์€ github ID๋กœ ํด๋”๋ฅผ ์ƒ์„ฑํ•œ๋‹ค.
  3. ์ƒ์„ฑ๋œ ํด๋”์— ์ž์‹ ์˜ ์†Œ์Šค์ฝ”๋“œ๋ฅผ ์—…๋กœ๋“œ ํ•œ๋‹ค. (ํด๋”๋ช…์— ์ฝœ๋ก ":" ์•ˆ๋ฉ๋‹ˆ๋‹ค!)
  4. ์ด๋•Œ commit ๊ทœ์น™์„ ์ง€ํ‚ค๋„๋กํ•œ๋‹ค!
  5. ์›๋ณธ ์ €์žฅ์†Œ๋กœ Pull Request๋ฅผ ํ•œ๋‹ค.
  6. ๋‹ค๋ฅธ ์‚ฌ๋žŒ๋“ค์˜ PR์„ ๋ณด๊ณ  ์ž์œ ๋กญ๊ฒŒ ์ฝ”๋“œ๋ฆฌ๋ทฐ๋ฅผ ํ•œ๋‹ค.
  7. ์ฃผ์˜!! ๊ธฐ์กด ํด๋”๋ฅผ ์ง€์šฐ๋ฉด ์•ˆ๋ฉ๋‹ˆ๋‹ค!! ๊ฐœ์ธ ํด๋” ๋‚ด๋ถ€๋งŒ ์ˆ˜์ •ํ•ด์ฃผ์„ธ์š” :)




๐Ÿ”ฅ ์ด๋ฒˆ ์ฃผ ๋ฌธ์ œ

๋ฌธ์ œ ์ด๋ฆ„ ์ถœ์ฒ˜ ์ฃผ์ œ ๋‚œ์ด๋„
ํŠธ๋Ÿญ ์ฃผ์ฐจ ๋ฐฑ์ค€ ๊ตฌํ˜„ ๋ธŒ๋ก ์ฆˆ 2
์˜ํ™”๊ฐ๋… ์ˆŒ ๋ฐฑ์ค€ ๋ธŒ๋ฃจํŠธํฌ์Šค ์•Œ๊ณ ๋ฆฌ์ฆ˜ ์‹ค๋ฒ„ 5
๊ฑฐ๋ฆฌ๋‘๊ธฐ ํ™•์ธํ•˜๊ธฐ ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค 2021 ์นด์นด์˜ค ์ฑ„์šฉ์—ฐ๊ณ„ํ˜• ์ธํ„ด์‹ญ LV 2


โœ๏ธ ์Šคํ„ฐ๋”” ๋ฐฉ๋ฒ•

  1. ์Šคํ„ฐ๋””์— ์ฐธ์—ฌํ•˜๋Š” ์ธ์›์€ '์ด๋ฒˆ ์ฃผ ๋ฌธ์ œ'๋ฅผ ํ’€๊ฑฐ๋‚˜
    ๊ฐ์ž์˜ ์‹ค๋ ฅ์— ๋งž๋Š” ๋ฌธ์ œ๋ฅผ ํ’€ ์ˆ˜๋„ ์žˆ์Šต๋‹ˆ๋‹ค.

  2. '์ด๋ฒˆ ์ฃผ ํ‘ผ์ œ'๋ฅผ ํ’€๊ณ  ์ฐจ์ฃผ ์ฒซ ์˜คํ”„๋ผ์ธ ์ˆ˜์—…์ด ๋๋‚˜๊ณ 
    ํ•จ๊ป˜ ์ฝ”๋“œ๋ฆฌ๋ทฐ๋ฅผ ์ง„ํ–‰ํ•ฉ๋‹ˆ๋‹ค.





๐Ÿ“” ์ง€๋‚œ ๋ฌธ์ œ
1
์ฃผ์ฐจ		 ์ˆซ์ž ๋ฌธ์ž์—ด๊ณผ ์˜๋‹จ์–ด ๋ถ€๋ถ„์ˆ˜์—ด์˜ ํ•ฉ Two Dots
์นด์นด์˜ค ์ฑ„์šฉ์—ฐ๊ณ„ํ˜• ์ธํ„ด์‹ญ ๋ธŒ๋ฃจ์Šคํฌ์Šค-์žฌ๊ท€ ๊ทธ๋ž˜ํ”„ ์•Œ๊ณ ๋ฆฌ์ฆ˜
2
์ฃผ์ฐจ		 ์ž˜๋ผ์„œ ๋ฐฐ์—ด๋กœ ์ €์žฅํ•˜๊ธฐ ๋‚ ์งœ ๊ณ„์‚ฐ ๋ฆฌ๋ชจ์ปจ ์ง‘ํ•ฉ DFS์™€ BFS
์ฝ”๋”ฉํ…Œ์ŠคํŠธ ์ž…๋ฌธ ๋ธŒ๋ฃจํŠธ ํฌ์Šค ๋ธŒ๋ฃจํŠธ ํฌ์Šค ๋ธŒ๋ฃจํŠธ ํฌ์Šค-๋น„ํŠธ๋งˆ์Šคํฌ ๊ทธ๋ž˜ํ”„ ํƒ์ƒ‰
3
์ฃผ์ฐจ		 ๋‚ด์  ๋‹จ์–ด์˜ ๊ฐœ์ˆ˜ ํ‡ด์‚ฌ ๋‹ค์Œ ์ˆœ์—ด ร—ใฐใคn ํƒ€์ผ๋ง
์›”๊ฐ„์ฝ”๋“œ์ฑŒ๋ฆฐ์ง€ ์‹œ์ฆŒ1 ๋ฌธ์ž์—ด ๋ธŒ๋ฃจํŠธ ํฌ์Šค-์žฌ๊ท€ ๋ธŒ๋ฃจํŠธ ํฌ์Šค-์ˆœ์—ด ๋‹ค์ด๋‚˜๋ฏนํ”„๋กœ๊ทธ๋ž˜๋ฐ
4
์ฃผ์ฐจ		 ๋ชจ์˜๊ณ ์‚ฌ N๋ฒˆ์งธ ํฐ ์ˆ˜ ์†Œ์ˆ˜ ์ฐพ๊ธฐ N๊ณผ M (1) ๋ฏธ๋กœ ํƒ์ƒ‰
์™„์ „ํƒ์ƒ‰ ์ˆ˜ํ•™ ์ˆ˜ํ•™ ๋ธŒ๋ฃจํŠธ ํฌ์Šค-N๊ณผ M ํ์™€ ๊ทธ๋ž˜ํ”„
5
์ฃผ์ฐจ		 ๋‘ ๊ฐœ ๋ฝ‘์•„์„œ ๋”ํ•˜๊ธฐ ํ”ผ๋ณด๋‚˜์น˜ ์ˆ˜ 2 ๊ด„ํ˜ธ N๊ณผ M (2) ์ด์ „ ์ˆœ์—ด
์›”๊ฐ„ ์ฝ”๋“œ ์ฑŒ๋ฆฐ์ง€ ์‹œ์ฆŒ1 ๋‹ค์ด๋‚˜๋ฏน ํ”„๋กœ๊ทธ๋ž˜๋ฐ ์Šคํƒ ๋ธŒ๋ฃจํŠธ ํฌ์Šค-N๊ณผ M ๋ธŒ๋ฃจํŠธ ํฌ์Šค - ์ˆœ์—ด
6
์ฃผ์ฐจ		 K๋ฒˆ์งธ์ˆ˜ ์ผ๊ณฑ ๋‚œ์Ÿ์ด 1 N๊ณผ M (3) ์•”ํ˜ธ ๋งŒ๋“ค๊ธฐ
์ •๋ ฌ ๋ธŒ๋ฃจํŠธ ํฌ์Šค ์ˆ˜ํ•™ ๋ธŒ๋ฃจํŠธ ํฌ์Šค - N๊ณผ M ๋ธŒ๋ฃจํŠธ ํฌ์Šค - ์žฌ๊ท€
7
์ฃผ์ฐจ		 ์‹ ๊ณ  ๊ฒฐ๊ณผ ๋ฐ›๊ธฐ ๋‹ฌํŒฝ์ด๋Š” ์˜ฌ๋ผ๊ฐ€๊ณ  ์‹ถ๋‹ค ร—ใฐใคn ํƒ€์ผ๋ง 2 N๊ณผ M (4) ์Šคํƒ€ํŠธ์™€ ๋งํฌ
2022 KAKAO BLIND RECRUITMENT ์ˆ˜ํ•™ ๋‹ค์ด๋‚˜๋ฏน ํ”„๋กœ๊ทธ๋ž˜๋ฐ ๋ธŒ๋ฃจํŠธ ํฌ์Šค - N๊ณผ M ๋ธŒ๋ฃจํŠธ ํฌ์Šค - ์žฌ๊ท€
8
์ฃผ์ฐจ		 SQL๊ณ ๋“์ kit (JOIN 11๋ฌธ์ œ)
ํ”„๋กœ๊ทธ๋ž˜๋จธ์Šค SQL๊ณ ๋“์ kit
9
์ฃผ์ฐจ		 x๋งŒํผ ๊ฐ„๊ฒฉ์ด ์žˆ๋Š” n๊ฐœ์˜ ์ˆซ์ž ํ•ธ๋“œํฐ ๋ฒˆํ˜ธ ๊ฐ€๋ฆฌ๊ธฐ ๋ช…๋ น ํ”„๋กฌํ”„ํŠธ ํ”ผ๋ณด๋‚˜์น˜ ์ˆ˜ 5 ๋™์ „ 0
์—ฐ์Šต๋ฌธ์ œ ์—ฐ์Šต๋ฌธ์ œ ๊ตฌํ˜„ ๋ฌธ์ž์—ด ์žฌ๊ท€ํ•จ์ˆ˜ ๊ทธ๋ฆฌ๋”” ์•Œ๊ณ ๋ฆฌ์ฆ˜
10
์ฃผ์ฐจ		 ๊ฐ€์žฅ ๊ฐ€๊นŒ์šด ๊ฐ™์€ ๊ธ€์ž ๊ทธ๋ฃน ๋‹จ์–ด ์ฒด์ปค ์ƒ‰์ข…์ด ๋ธ”๋ž™์žญ ์ˆ˜ ์ •๋ ฌํ•˜๊ธฐ
์—ฐ์Šต๋ฌธ์ œ ๊ตฌํ˜„ ๊ตฌํ˜„ ๋ฌธ์ž์—ด ๋ธŒ๋ฃจํŠธํฌ์Šค ์•Œ๊ณ ๋ฆฌ์ฆ˜ ๊ตฌํ˜„
11
์ฃผ์ฐจ		 2์ฐจ์› ๋ฐฐ์—ด ๋‹ค๋ฃจ์–ด ๋ณด๊ธฐ ์‚ผ๊ฐ ๋‹ฌํŒฝ์ด
์œ„ํด๋ฆฌ ์ฑŒ๋ฆฐ์ง€ ์›”๊ฐ„ ์ฝ”๋“œ ์ฑŒ๋ฆฐ์ง€ ์‹œ์ฆŒ 1

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