[leetcode] 21. Merge Two Sorted Lists (Easy)
合并链表
Runtime: 4 ms, faster than 100.00% of C++ online submissions for Merge Two Sorted Lists.
- class Solution
- {
- public:
- ListNode *mergeTwoLists(ListNode *l1, ListNode *l2)
- { //1 2 4 . 1 3 4
- ListNode *res = new ListNode();
- ListNode *cur = res;
- while (l1 != NULL && l2 != NULL)
- {
- if (l1->val <= l2->val)
- {
- cur->next = l1;
- l1 = l1->next;
- cur = cur->next;
- }
- else
- {
- cur->next = l2;
- l2 = l2->next;
- cur = cur->next;
- }
- }
- if (l1 != NULL)
- cur->next = l1;
- else
- cur->next = l2;
- return res->next;
- }
- };
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