双端队列免切片返回
从尾到头打印链表
http://www.nowcoder.com/questionTerminal/d0267f7f55b3412ba93bd35cfa8e8035
from collections import deque
class Solution:
# 返回从尾部到头部的列表值序列，例如[1,2,3]
def printListFromTailToHead(self, listNode):
# write code here
result = deque()
while listNode:
result.appendleft(listNode.val)
listNode = listNode.next
return result
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