题解 | #删除有序链表中重复的元素-II#

package main

import (
 
	. "nc_tools"
)

/*
 * type ListNode struct{
 *   Val int
 *   Next *ListNode
 * }
 */

/**
 * 代码中的类名、方法名、参数名已经指定，请勿修改，直接返回方法规定的值即可
 *
 *
 * @param head ListNode类
 * @return ListNode类
 */
func deleteDuplicates(head *ListNode) *ListNode {
	// write code here
	dummy := &ListNode{Next: head}
	curr, prev := head, dummy
	for curr != nil && curr.Next != nil {
		if curr.Val == curr.Next.Val {
			for curr.Next != nil && curr.Val == curr.Next.Val {
				curr = curr.Next
			}
            prev.Next = curr.Next
		} else {
            prev = prev.Next
        }
        curr = curr.Next
	}
	return dummy.Next
}