LeetCode 21. Merge Two Sorted Lists
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递归方法:
/** * Definition for singly-linked list. * struct ListNode { * int val; * ListNode *next; * ListNode(int x) : val(x), next(NULL) {} * }; */class Solution {public: ListNode* mergeTwoLists(ListNode* l1, ListNode* l2) { if(l1==nullptr ) return l2; if(l2==nullptr) return l1; if(l1->val<l2->val) {l1->next = mergeTwoLists(l1->next,l2); return l1;} else{ l2->next = mergeTwoLists(l1,l2->next); return l2; } }};
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