[radiantchoi] WEEK 09 Solutions#2258
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radiantchoi merged 3 commits intoDaleStudy:mainDaleStudy/leetcode-study:mainfrom Jan 9, 2026
Merged
[radiantchoi] WEEK 09 Solutions#2258radiantchoi merged 3 commits intoDaleStudy:mainDaleStudy/leetcode-study:mainfrom
radiantchoi merged 3 commits intoDaleStudy:mainDaleStudy/leetcode-study:mainfrom
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์ด๋ฒ ์ฃผ ์๊ณ ๋ฆฌ์ฆ ํธ์๋๋ผ ์๊ณ ํ์ จ์ต๋๋ค! ์ฌ๋ ค์ฃผ์ ์ฝ๋ ์ ๋ณด์์ต๋๋ค.
๋ฆ๊ฒ ์น์ธ ํด๋๋ ค ์ฃ์กํฉ๋๋ค ๐ข
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| /* | ||
| ์ฌ์ดํด ์์ ์ง์ ์ ์ฐพ์ผ์์ค, ๋ผ๋ ๋ฌธ์ ์ผ ๊ฒฝ์ฐ? | ||
| entry๋ผ๋ ๋ณ๋์ ํฌ์ธํฐ๋ฅผ ํ๋ ๋ ๋ ๋ค์ slow์ ํจ๊ป ํ ์นธ์ฉ ์ด๋์ํจ๋ค. | ||
| ๋ ํฌ์ธํฐ๊ฐ ๋ง๋๋ ์ง์ ์ด ์ฌ์ดํด ์์ ์ง์ ! | ||
| ์ด๊ฒ์ด ๊ฐ๋ฅํ ์ด์ ๋, ์๋์ ์ด๋ ๊ฑฐ๋ฆฌ ๊ณต์ ๋๋ฌธ์ ๊ทธ๋ ๋ค. | ||
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| L: ์ฌ์ดํด ์ ๊ตฌ๊น์ง์ ๊ธธ์ด | ||
| C: ์ฌ์ดํด ๊ธธ์ด | ||
| d: ์ฌ์ดํด ๋ด์์, ์ฌ์ดํด ์ข ๋ฃ(==์์)๊น์ง ๋จ์ ๊ฑฐ๋ฆฌ | ||
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| fast์ ์ด๋ ๊ฑฐ๋ฆฌ: L + n * C + d | ||
| slow์ ์ด๋ ๊ฑฐ๋ฆฌ: L + d | ||
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| fast์ ์ด๋ ๊ฑฐ๋ฆฌ๋ slow์ ์ด๋ ๊ฑฐ๋ฆฌ์ 2๋ฐฐ์ด๋ฏ๋ก | ||
| 2 * (L + d) = L + n * C + d | ||
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| ๋ฐ๋ผ์, L = n * C - d ์ด๋ค. | ||
| ๊ทธ๋ฆฌ๊ณ L์ entry ํฌ์ธํฐ๊ฐ ์ด๋ํด์ผ ํ๋ ๊ฑฐ๋ฆฌ์ด๋ค. | ||
| n * C - d๋ ์ฌ์ดํด ์์์๋ C - d์ ๊ฐ๋ค. fast ๋ ธ๋๊ฐ n๋ฒ ๋์์ ๋ฟ, ์ฌ์ดํด ์์ด์๊ธฐ ๋๋ฌธ. | ||
| ๋ฐ๋ผ์ entry ํฌ์ธํฐ์ slow ํฌ์ธํฐ๋ฅผ ๋ค์ ํ ์นธ์ฉ ์ด๋์ํค๋ค ๋ณด๋ฉด, ๋ฐ๋์ ๋ง๋๊ฒ ๋๋ค. | ||
| ์ด ๋ง๋๋ ์ง์ ์ด ์ฌ์ดํด ์์ ์ง์ . | ||
| */ |
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๋ฌธ์ ๋ฅผ ํ์ฅํด์๋ ์๊ฐ ํ์ จ๋ค์!
๋๋ถ์, ์์ ์ง์ ์ฐพ๋ ๋ฐฉ๋ฒ ๋ฐฐ์๊ฐ์ ๐
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์ฌ์ค ์ด๋ฒ์ Floyd's cycle detection algorithm์ด๋ผ๋ ๊ฑธ ์์ ์ฒ์ ์ ํ๋ค ๋ณด๋, ๊ฒฐ๊ตญ ๋ง๋๋ ์ง์ ์ ์ฐพ์์ ์ด๋๋ค ์ฐ์ง? ๋ผ๋ ์๋ฌธ์ด ๋ค์์ต๋๋ค. ๊ทธ๋ฆฌ๊ณ ์ญ์๋, ๊ทธ๋ฐ ๋ฌธ์ ๊ฐ ์๊ธด ํ๋๋ผ๊ตฌ์. ๋์์ด ๋์ จ๋ค๋ ๊ธฐ์ฉ๋๋ค.
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๋ต์ ์ ์ถ ๋ฌธ์
์์ฑ์ ์ฒดํฌ ๋ฆฌ์คํธ
In Review๋ก ์ค์ ํด์ฃผ์ธ์.๊ฒํ ์ ์ฒดํฌ ๋ฆฌ์คํธ
Important
๋ณธ์ธ ๋ต์ ์ ์ถ ๋ฟ๋ง ์๋๋ผ ๋ค๋ฅธ ๋ถ PR ํ๋ ์ด์์ ๋ฐ๋์ ๊ฒํ ๋ฅผ ํด์ฃผ์ ์ผ ํฉ๋๋ค!