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21. Merge Two Sorted Lists
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โ€Žmerge-two-sorted-lists/okyungjin.pyโ€Ž

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# list1์˜ ๋…ธ๋“œ ๊ฐœ์ˆ˜๋ฅผ n, list2์˜ ๋…ธ๋“œ ๊ฐœ์ˆ˜๋ฅผ m์ด๋ผ ํ•  ๋•Œ
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# ์‹œ๊ฐ„ ๋ณต์žก๋„: O(n + m)
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# ๊ณต๊ฐ„ ๋ณต์žก๋„: O(n + m) ->
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# ๊ณต๊ฐ„ ๋ณต์žก๋„: O(n + m)
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class Solution_01:
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def mergeTwoLists(self, list1: Optional[ListNode], list2: Optional[ListNode]) -> Optional[ListNode]:
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# ๋งจ ์•ž์— ๋”๋ฏธ ๋…ธ๋“œ๋ฅผ ํ•˜๋‚˜ ์ถ”๊ฐ€ํ•œ๋‹ค
@@ -69,7 +69,7 @@ def mergeTwoLists(self, list1: Optional[ListNode], list2: Optional[ListNode]) ->
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# list1์˜ ๋…ธ๋“œ ๊ฐœ์ˆ˜๋ฅผ n, list2์˜ ๋…ธ๋“œ ๊ฐœ์ˆ˜๋ฅผ m์ด๋ผ ํ•  ๋•Œ
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# ์‹œ๊ฐ„ ๋ณต์žก๋„: O(n + m)
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# ๊ณต๊ฐ„ ๋ณต์žก๋„: O(1) -> dummy๋งŒ ์‚ฌ์šฉ, ์ถ”๊ฐ€ ๊ณต๊ฐ„ ๋ณต์žก๋„๋Š” O(1)
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class Solution_01:
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class Solution:
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def mergeTwoLists(self, list1: Optional[ListNode], list2: Optional[ListNode]) -> Optional[ListNode]:
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# ๋งจ ์•ž์— ๋”๋ฏธ ๋…ธ๋“œ๋ฅผ ํ•˜๋‚˜ ์ถ”๊ฐ€ํ•œ๋‹ค
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# ์—†๋Š” ์ƒํƒœ๋กœ ์งฐ๋Š”๋ฐ if node: else: ๊ตฌ๋ฌธ ๋Š˜์–ด๋‚˜์„œ ๋งจ ์•ž์— ๊ฐ€์ƒ์˜ ๋…ธ๋“œ๋ฅผ ํ•˜๋‚˜ ์ถ”๊ฐ€ํ•ด์คฌ๋‹ค

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