LeetCode: Remove Duplicates from Sorted List

list比array更简单， 一次过

/**
 * 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) {
        // Start typing your C/C++ solution below
        // DO NOT write int main() function
        ListNode *cur = head;
        while (cur) {
            while (cur->next && cur->val == cur->next->val) {
                cur->next = cur->next->next;
            }
            cur = cur->next;
        }
        return head;
    }
};

 C#

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