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.
s思路:
1. 常规题。就是考察对list的操作,需要边比较边根据比较的结果来觉得移动两个list中的那一个的指针。
//方法1:用recursive的方法来比较class Solution {public: ListNode* mergeTwoLists(ListNode* l1, ListNode* l2) { if(!l1) return l2; if(!l2) return l1; if(l1->val>l2->val){ l2->next=mergeTwoLists(l1,l2->next); return l2; }else{ l1->next=mergeTwoLists(l1->next,l2); return l1; } }};
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