题目描述:
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
.
思路:
1.简单暴力,下一个数和本数相同,那么就本数的next指向下下一个数
2.时间复杂度O(n)
3.注意边界
代码:
/**
* Definition for singly-linked list.
* struct ListNode {
* int val;
* ListNode *next;
* ListNode(int x) : val(x), next(NULL) {}
* };
*/
class Solution {
public:
ListNode* deleteDuplicates(ListNode* head)
{
ListNode* cur = head;
while(cur !=NULL && cur->next!=NULL)
{
if(cur->val == cur->next->val)
cur->next = cur->next->next;
else
cur = cur->next;
}
return head;
}
};