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                有序鏈表合并是指將兩個已經有序的鏈表按照從小到大的順序進行合并,得到一個新的有序鏈表。以下是 Js 代碼實現: ```javascript function ListNode(val) { this.val = val; this.next = null; } function mergeTwoLists(l1, l2) { let dummy = new ListNode(-1); let cur = dummy; while (l1 !== null && l2 !== null) { if (l1.val < l2.val) { cur.next = l1; l1 = l1.next; } else { cur.next = l2; l2 = l2.next; } cur = cur.next; } cur.next = l1 ? l1 : l2; return dummy.next; } ``` 首先創建一個新的鏈表頭 `dummy`,用于存儲合并后的鏈表結果。然后使用一個 `cur` 指針來遍歷鏈表,同時比較兩個鏈表的節點值大小,并將較小的節點接在合并鏈表的末尾。最后,將未合并完的鏈表直接連接到合并鏈表的末尾即可。 這段代碼的時間復雜度為 $O(m+n)$,其中 $m$ 和 $n$ 分別為兩個鏈表的長度。
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