题目:
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
.
解答:
/**
* 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) {
if(head == NULL || head -> next == NULL) {
return 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;
}
};
中规中矩的一道题,唯一能算得上难点的就是cur的移动规则,如果判断相同,cur不移动,只有判断不同时,cur向前移动一步