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.

采用頭插法實現順序插入，C++代碼如下：

#include<iostream> #include<new> using namespace std;//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 *pp=NULL;ListNode *p=NULL;ListNode *q=NULL;if(head&&head->next){pp=head;p=head->next;while(p){if(pp->val==p->val){q=p;pp->next=q->next;p=q->next;delete q;}else{pp=p;p=p->next;}}}return head;}void createList(ListNode *&head){ListNode *p=NULL;int i=0;int arr[10]= {5,5,5,4,4,3,3,3,2,1};for(i=0; i<10; i++){if(head==NULL){head=new ListNode(arr[i]);if(head==NULL)return;}else{p=new ListNode(arr[i]);p->next=head;head=p;}}} };int main() {Solution s;ListNode *L=NULL;s.createList(L);ListNode *head=L;while(head){cout<<head->val<<" ";head=head->next;}cout<<endl;L=s.deleteDuplicates(L);while(L){cout<<L->val<<" ";L=L->next;} }

運行結果：

總結

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