leetcode--Remove Duplicates from Sorted List

时间：2014-06-06 07:00:36 收藏：0 阅读：269

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.

/**
 * Definition for singly-linked list.
 * public class ListNode {
 *     int val;
 *     ListNode next;
 *     ListNode(int x) {
 *         val = x;
 *         next = null;
 *     }
 * }
 */
public 
class Solution {
    public 
ListNode deleteDuplicates(ListNode head) {
        if(head != null){
            ListNode currentFirst = head;
            ListNode currentNode = head.next;
            while(currentNode != null){
                if(currentFirst.val != currentNode.val){
                    currentFirst.next = currentNode;
                    currentFirst = currentFirst.next;
                }
                currentNode = currentNode.next;
            }
            if(currentFirst.next != null)
                currentFirst.next = null;
        }
        return 
head;    
    }
}

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