LeetCode-----21. Merge Two Sorted Lists
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Merge two sorted linked lists and return it as a new list. The new list should be made by splicing together the nodes of the first two lists.
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public class Solution { public ListNode mergeTwoLists(ListNode l1, ListNode l2) { ListNode dummy = new ListNode(0); ListNode lastNode = dummy; while (l1 != null && l2 != null) { if (l1.val < l2.val) { lastNode.next = l1; l1 = l1.next; } else { lastNode.next = l2; l2 = l2.next; } lastNode = lastNode.next; } if (l1 != null) { lastNode.next = l1; } else { lastNode.next = l2; } return dummy.next; }}
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