21. Merge Two Sorted Lists的C++解法
題目描述:https://leetcode.com/problems/merge-two-sorted-lists/
注意構造方式以及新建一個列表頭的處理方法。
class Solution { public: ListNode * mergeTwoLists(ListNode * l1, ListNode * l2) { ListNode *res=new ListNode(0); ListNode *ans=res; while (l1!=NULL && l2!=NULL) { if (l1->val<l2->val) {res->next=l1;l1=l1->next;} else {res->next=l2;l2=l2->next;} res=res->next; } if (l1!=NULL) res->next=l1; if (l2!=NULL) res->next=l2; return ans->next; } };
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