leetcode 83. Remove Duplicates from Sorted List

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83. Remove Duplicates from Sorted List

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Total Accepted: 102841 Total Submissions: 284006 Difficulty: Easy

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.

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/**
 * 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* p1 = head->next;
        ListNode* p2 = head;
        while(p1 != NULL){
            if(p1->val == p2->val){
                p1 = p1->next;
            }
            else{
                p2->next = p1;
                p2 = p2->next;
                p2->val = p1->val;
                p1 = p1->next;
            }
        }
        p2->next = NULL;
        return head;
    }
};