题解 | #牛群排列去重#

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
    if head ==nil || head.Next == nil{
        return head
    }
    prev := &ListNode{-1,head};
    current :=head
    for current != nil{
        if current.Val == prev.Val{
            prev.Next=current.Next
            current = current.Next
        }else{
            prev=current
            current = current.Next
        }
    }
    return head
    
}