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.
基本的递归做法。注意null的检查
/** * Definition for singly-linked list. * public class ListNode { * int val; * ListNode next; * ListNode(int x) { val = x; } * } */public class Solution { public ListNode mergeTwoLists(ListNode l1, ListNode l2) { if(l1==null) return l2; if(l2==null) return l1; if(l1.val < l2.val){ l1.next = mergeTwoLists(l1.next,l2); return l1; }else{ l2.next = mergeTwoLists(l2.next,l1); return l2; } }} 0 0
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