LeetCode 21 合并两个有序链表

Posted 2021-12-14 Starzkg

https://leetcode-cn.com/problems/merge-two-sorted-lists/

解决方案

class Solution 
    public ListNode mergeTwoLists(ListNode l1, ListNode l2) 
        ListNode head = new ListNode();
        ListNode pos = head;
        while (l1 != null && l2 != null) 
            if (l1.val <= l2.val) 
                pos.next = l1;
                pos = l1;
                l1 = l1.next;
             else 
                pos.next = l2;
                pos = l2;
                l2 = l2.next;
            
        
        while (l1 != null) 
            pos.next = l1;
            pos = l1;
            l1 = l1.next;
        
        while (l2 != null) 
            pos.next = l2;
            pos = l2;
            l2 = l2.next;
        
        return head.next;