题解 | #删除有序链表中重复的元素-II#

func deleteDuplicates( head *ListNode ) *ListNode {
    // write code here
    
    dummy := &ListNode{-1, head}
    
    tmp := dummy
    flag := false 
    for tmp.Next != nil {
        find := tmp.Next 
        val := find.Val 
        for find.Next != nil && find.Next.Val == val {
            find = find.Next 
            flag = true 
        }
        if flag {
            tmp.Next = find.Next 
        } else {
            tmp = find 
        }
        
        flag = false 
    }
    
    return dummy.Next  
}