删除排序链表中的重复元素（简单）

"""
Definition of ListNode
class ListNode(object):
    def __init__(self, val, next=None):
        self.val = val
        self.next = next
"""


class Solution:
    """
    @param: head: head is the head of the linked list
    @return: head of linked list
    """
    def deleteDuplicates(self, head):
        if head is None:
            return head
        temp = head
        while temp.next is not None:
            if temp.next.val == temp.val:
                temp.next = temp.next.next
            else:
                temp = temp.next
        return head