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feat: merge-two-sorted-lists
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/**
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* Definition for singly-linked list.
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* function ListNode(val, next) {
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* this.val = (val===undefined ? 0 : val)
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* this.next = (next===undefined ? null : next)
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* }
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*/
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/**
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* @param {ListNode} list1
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* @param {ListNode} list2
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* @return {ListNode}
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*/
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/**
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* list๋Š” ์˜ค๋ฆ„ ์ฐจ์ˆœ์œผ๋กœ ์ •๋ ฌ๋˜์–ด ์žˆ๊ธฐ ๋•Œ๋ฌธ์— ๋‘ ๊ฐœ์˜ ๋ฆฌ์ŠคํŠธ์˜ head๊ฐ€ ๋” ์ž‘์€ ๊ฐ’์ด listNode์˜ next์— ์ˆœ์„œ๋Œ€๋กœ ๋“ค์–ด์˜ค๊ฒŒ ํ•˜๋ฉด ๋ฉ๋‹ˆ๋‹ค.
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* list ๋‘˜ ์ค‘ํ•˜๋‚˜๊ฐ€ ์—†๋Š” ๊ฒฝ์šฐ์—๋Š” ๋‚˜๋จธ์ง€ ๋‹ค๋ฅธ ํ•˜๋‚˜์˜ ๋ฆฌ์ŠคํŠธ๋ฅผ ๋ฐ˜ํ™˜ํ•ฉ๋‹ˆ๋‹ค.
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* ๋‘ ํ—ค๋“œ ์ค‘์—์„œ ๋” ์ž‘์€ ๊ฐ’์˜ next์— ์žฌ๊ท€์ ์œผ๋กœ ๋‹ค์Œ ๋งํฌ๋“œ ๋ฆฌ์ŠคํŠธ๋ฅผ ๋„˜๊ฒจ์ฃผ๋ฉด์„œ ๋น„๊ตํ•˜๋Š” ๋ฐฉ๋ฒ•์œผ๋กœ ๋ฌธ์ œ๋ฅผ ํ•ด๊ฒฐํ–ˆ์Šต๋‹ˆ๋‹ค
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*
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*/
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var mergeTwoLists = function(list1, list2) {
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if(!list1 || !list2) return list1 || list2
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if(list1.val < list2.val){
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list1.next = mergeTwoLists(list1.next,list2)
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return list1
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}
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list2.next = mergeTwoLists(list2.next,list1);
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return list2;
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};

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