Leetcode first fl _ Merge Two Sorted Lists

Source: Internet
Author: User

This is a simple question.

The only challenge is to ensure that no additional space is introduced. Find a linked list with the minimum initial value as the head of the new linked list and remove the head from the linked list, other operations should be fine.

Class Solution {public: ListNode * mergeTwoLists (ListNode * l1, ListNode * l2) {if (l1 = NULL) return l2; if (l2 = NULL) return l1; if (l1-> val> l2-> val) swap (l1, l2); ListNode * head = l1, * pNode = l1; l1 = l1-> next; head-> next = NULL; while (l1 & l2) {if (l1-> val <= l2-> val) {pNode-> next = l1; pNode = l1; l1 = l1-> next;} else {pNode-> next = l2; pNode = l2; l2 = l2-> next;} pNode-> next = NULL ;} if (l1) pNode-> next = l1; if (l2) pNode-> next = l2; return head ;}};

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