1.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
.
2.解决方案
class Solution {
public:
ListNode *deleteDuplicates(ListNode *head) {
if(!head)
return NULL;
ListNode* firstNode = head;
ListNode* currentNode = head;
ListNode* nextNode = head;
while(currentNode->next){
if(currentNode->val == currentNode->next->val){