leetcode 083 Remove Duplicates from Sorted List（难易度：Easy）

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

.

代码：
/**
* Definition for singly-linked list.
* struct ListNode {
* int val;
* struct ListNode *next;
* };
*/
struct ListNode* deleteDuplicates(struct ListNode* head) {
if(head != NULL) {
struct ListNode *p = head;
while(p->next != NULL) { //p不是最后一个节点
if(p->val != p->next->val) //后一个和前一个相同
p = p->next;
else {
struct ListNode *tmp = p->next;
p->next = p->next->next;
free(tmp);
}
}
}
return head;
}原题地址：https://leetcode.com/problems/remove-duplicates-from-sorted-list/