LeetCode-将两个有序链表合并为一个新的有序链表并返回。新链表是通过拼接给定的两个链表的所有节点组成的。 示例: 输入:1->2->4, 1->3->4 输出:1->1->2->3->4->4
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/** * Definition for singly-linked list. * struct ListNode { * int val; * struct ListNode *next; * }; */ struct ListNode* mergeTwoLists(struct ListNode* l1, struct ListNode* l2) { if (l1 == NULL && l2 == NULL) return NULL; struct ListNode *ret = (struct ListNode *)malloc(sizeof(struct ListNode)); struct ListNode *cur = ret; while(l1 || l2) { struct ListNode *tmp = (struct ListNode *)malloc(sizeof(struct ListNode)); if (l1 && l2) { if (l1->val > l2->val) { tmp->val = l2->val; l2 = l2->next; } else { tmp->val = l1->val; l1 = l1->next; } } else if(l1 == NULL) { tmp->val = l2->val; l2 = l2->next; } else { tmp->val = l1->val; l1 = l1->next; } cur->next = tmp; cur = cur->next; } return ret->next; }
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