Thursday, February 4, 2016

Remove Duplicates from Sorted List

Remove Duplicates from Sorted List

Given a sorted linked list, delete all duplicates such that each element appear only once.

Example
Given 1->1->2, return 1->2.

Given 1->1->2->3->3, return 1->2->3.

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/**
 * Definition for ListNode
 * public class ListNode {
 *     int val;
 *     ListNode next;
 *     ListNode(int x) {
 *         val = x;
 *         next = null;
 *     }
 * }
 */
public class Solution {
    /**
     * @param ListNode head is the head of the linked list
     * @return: ListNode head of linked list
     */
    public static ListNode deleteDuplicates(ListNode head) { 
        // write your code here
        ListNode cur = head;
        
        if (head == null) {
            return head;
        }
        
        while (cur.next != null) {
            if (cur.val == cur.next.val) {
                cur.next = cur.next.next;
            }
            else {
                cur = cur.next;
            }
        }
        
        return head;
    }  
}
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