检查字典中是否存在节点值

Question

我正在尝试编写一个 sn-p 用于在 python 中删除链表中的重复元素。

我在字典中检查先前节点值的条件不正确。我无法弄清楚为什么它总是返回 false。

节点值为 [ 0->1->2->2->3->4->4->5

def RemoveRepeatNode(self):
    curr_node = self.head
    unique_list = {}
    unique_list[curr_node.data] = 1

    while(curr_node.next != None):
        if curr_node.next.data in unique_list: ## doesn't evaluate to True
            print "repeated values ", curr_node.next.data
            curr_node = curr_node.next.next
        else:
            unique_list[curr_node.data] = 1
            curr_node = curr_node.next

Answer 1

您的 if 子句可能没问题，但您不要重新链接。变化：

def RemoveRepeatNode(self):
    curr_node = self.head
    unique = {curr_node.data}  # better data structure: set

    while(curr_node.next != None):
        if curr_node.next.data in unique:
            curr_node.next = curr_node.next.next
            #        ^^^^^  relink!
        else:
            unique.add(curr_node.next.data) 
            # add .next.data         ^^^^^  that's the one you checked
            curr_node = curr_node.next