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lines changed Original file line number Diff line number Diff line change 1+ /**
2+ * Definition for singly-linked list.
3+ * function ListNode(val, next) {
4+ * this.val = (val===undefined ? 0 : val)
5+ * this.next = (next===undefined ? null : next)
6+ * }
7+ */
8+ /**
9+ * @param {ListNode } list1
10+ * @param {ListNode } list2
11+ * @return {ListNode }
12+ */
13+ var mergeTwoLists = function ( list1 , list2 ) {
14+ // ๋ฆฌ์คํธ๊ฐ ๋น์์ ๋ ๋ค๋ฅธ ๋ฆฌ์คํธ ๋ฐํ
15+ if ( list1 === null ) return list2 ;
16+ if ( list2 === null ) return list1 ;
17+
18+ // ์์ ๊ฐ ๊ฐ์ง ๋
ธ๋ ์ ํํ๊ณ ์ฌ๊ทํธ์ถ
19+ if ( list1 . val <= list2 . val ) {
20+ list1 . next = mergeTwoLists ( list1 . next , list2 ) ;
21+ return list1 ;
22+ } else {
23+ list2 . next = mergeTwoLists ( list1 , list2 . next ) ;
24+ return list2 ;
25+ }
26+ } ;
27+
28+ // ์๊ฐ ๋ณต์ก๋: O(n1+n2)
29+ // ๊ณต๊ฐ ๋ณต์ก๋: O(1)
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