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Remove Duplicates from Sorted List

Given a sorted linked list, delete all duplicates such that each element appear only once.

For example, Given 1->1->2, return 1->2. Given 1->1->2->3->3, return 1->2->3.


设p指向当前节点,初始化为p = head, q = p->next, 则:

  • 若q为null,则说明已到达尾部节点,直接返回
  • q->val != p->val, 更新p节点, p = p->next
  • 否则删除q节点,即p->next = p->next->next; free(q)
struct ListNode* deleteDuplicates(struct ListNode *head)
	struct ListNode *p = head;
	while (p) {
		struct ListNode *q = p->next;
		if (q && p->val == q->val) {
			p->next = p->next->next;
		} else
			p = p->next;
	return head;


删除所有的重复节点Remove Duplicates from Sorted List II

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