题目描述
在一个排序的链表中,存在重复的结点,请删除该链表中重复的结点,重复的结点不保留。
样例1
输入:1->2->3->3->4->4->5
输出:1->2->5
样例2
输入:1->1->1->2->3
输出:2->3
C++ 代码
/**
* Definition for singly-linked list.
* struct ListNode {
* int val;
* ListNode *next;
* ListNode(int x) : val(x), next(NULL) {}
* };
*/
class Solution {
public:
ListNode* deleteDuplication(ListNode* head) {
auto d = new ListNode(0);
d->next = head;
auto p = d;
while (p->next)
{
auto q = p->next;
while (q && p->next->val == q->val) q = q->next;
if (p->next->next == q) p = p->next;
else
{
auto t = p->next;
p->next = q;
while (t != q)
{
auto tmp = t->next;
delete t;
t = tmp;
}
}
}
head = d->next;
delete d;
return head;
}
};