L2-006 树的遍历 (25 分)

from collections import deque
def level(root,lv):
    queue=deque()
    queue.append(root)
    while len(queue)>0:
        node=queue.popleft()
        lv.append(node.data)
        if  node.lchild!=None:
            queue.append(node.lchild)
        if node.rchild!=None:
            queue.append(node.rchild)
    return lv
class Tree:
    def creat(self,post,mid):
        if post==[] or mid==[]:
            return
        root=Node(post[-1])
        i=mid.index(post[-1])
        root.lchild=self.creat(post[:i],mid[:i])
        root.rchild=self.creat(post[i:len(post)-1],mid[i+1:])
        return root
class Node:
    def __init__(self,data):
        self.data=data
        self.lchild=None
        self.rchild=None
n=int(input())
post=input().split()
mid=input().split()
an=Tree()
b=an.creat(post,mid)
print(*level(b,[]))