37-pknujsp #149
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,53 @@ | ||
| def solution(coin, cards): | ||
| a = set(cards[:len(cards) // 3]) | ||
| b = set() | ||
| t = len(cards) + 1 | ||
| r = 1 | ||
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| for i in range(len(cards) // 3 + 1, len(cards), 2): | ||
| c1, c2 = cards[i - 1], cards[i] | ||
| b.add(c1) | ||
| b.add(c2) | ||
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| removed = False | ||
| # ํ์ฌ ๊ฐ์ง๊ณ ์๋ ์นด๋ ๋ชฉ๋ก ์ค n + 1์ด ๊ฐ๋ฅํ ๊ฒฝ์ฐ ํ์ธ | ||
| for x in list(a): | ||
| if t - x in a: | ||
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There was a problem hiding this comment. t - x๋ฅผ ๋ฐ๋ก ๋ณ์๋ก ๋ด์ ํ์ ์์ด ๊ตฌํ์ด ๊ฐ๋ฅํ๊ตฐ์ .. ์ด๋ ๊ฒ ๋ณ์ ํ๋๋ฅผ ๋ ์ค์ผ ์ ์๊ตฐ์.. ๐ There was a problem hiding this comment. ๋ต ์ ์ฝ๋ฉํธ์ ๋ด์ฉ๊ณผ ๊ฐ์ ๋ถ๋ถ์ผ๋ก ๋ณด์๋ฉด ๋ฉ๋๋ค |
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| a.remove(t - x) | ||
| a.remove(x) | ||
| removed = True | ||
| break | ||
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| if removed: | ||
| r += 1 | ||
| continue | ||
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| # ์ฝ์ธ์ผ๋ก ๊ตํํด์ ์ป์ ์ ์๋ ์นด๋ ์ค์์ n + 1์ด ๋๋ ๊ฒฝ์ฐ๋ฅผ ์ฐพ์์ผ ํจ | ||
| # ์ฝ์ธ์ด ์์ผ๋ฏ๋ก ์ข ๋ฃ | ||
| if not coin: | ||
| break | ||
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| # `ํ์ฌ ๊ฐ๊ณ ์๋ ์นด๋ + ์ป์ ์ ์๋ ์นด๋` = n + 1์ด ๋๋ ๊ฒฝ์ฐ๋ฅผ ํ์ธ | ||
| for x in list(b): | ||
| if t - x in a: | ||
| a.remove(t - x) | ||
| b.remove(x) | ||
| removed = True | ||
| coin -= 1 | ||
| break | ||
| # ๋ง์ง๋ง ๋ฐฉ๋ฒ์ผ๋ก, ์ค์ง ๊ตํ์ผ๋ก ์ป์ ์ ์๋ ์นด๋ ๋ชฉ๋ก ์ค์์ n + 1์ด ๋๋ ๊ฒฝ์ฐ๋ฅผ ํ์ธ | ||
| if not removed and coin >= 2: | ||
| for x in list(b): | ||
| if t - x in b: | ||
| b.remove(t - x) | ||
| b.remove(x) | ||
| removed = True | ||
| coin -= 2 | ||
| break | ||
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| # n + 1์ ์ด๋ค ๊ฒฝ์ฐ์๋ ๋ชป ๋ง๋ค๋ฉด ์ข ๋ฃ | ||
| if not removed: | ||
| break | ||
| r += 1 | ||
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| return r | ||
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์ค์ฑ๋ ์๋ ์ฝ๋๋ณด๋ฉด์ ์ฝ๋ ์์ฑํ๋ค๊ฐ ๊ถ๊ธํ๊ฒ ์๊ฒจ์ ์ฝ๋ฉํธ ๋จ๊น๋๋น
set์ด ์๋๋ผ list๋ก ๊ตฌํํด๋ ํต๊ณผ๋ ๋๋๋ฐ ์งํฉ์ผ๋ก ๊ตฌํํ์ ์ด์ ๊ฐ ์๊ฐ ๋ณต์ก๋ ๋๋ฌธ์ผ๊น์?
for ~ in์์ list์ ๊ฒฝ์ฐ์๋ ์๊ฐ๋ณต์ก๋๊ฐ O(n), set์ ๊ฒฝ์ฐ์๋ O(1)์ด์ฌ์ ์งํฉ์ผ๋ก ๊ตฌํํ์ ๊ฑด์ง ๊ถ๊ธํฉ๋๋ค!
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๋ค๋ค ๋ง์ํ์ ๊ทธ๋๋ก ์ ๋๋ค
์นด๋ ๋ชฉ๋ก์์
n + 1์ด ๋๋ ์กฐํฉ์ ํ์ธํด๋ณผ๋๋ฆฌ์คํธ๋ก ํ๋ค๋ฉด ๋ชจ๋ ์นด๋๋ฅผ ๋ ์์ผ๋ก ๋ง๋ค์ด์ ์ผ์ผํ ๋ค ๋น๊ตํด์ผ ํ๋๋ฐ
์งํฉ์ด๋ผ๋ฉด ์์ผ๋ก ๋น๊ตํ ํ์์์ด ์นด๋ ํ๋์ฉ๋ง ํ์ธํด๋ณด๋ฉด์
n + 1์ด ๊ฐ๋ฅํ ์นด๋์ ์กด์ฌ์ฌ๋ถ๋ฅผ ํ๋ฒ์ ํ์ธ๊ฐ๋ฅํ๋๊น์.