用兩個棧實現(xiàn)一個隊列。隊列的聲明如下，請實現(xiàn)它的兩個函數(shù) appendTail 和 deleteHead ，分別完成在隊列尾部插入整數(shù)和在隊列頭部刪除整數(shù)的功能。(若隊列中沒有元素，deleteHead 操作返回 -1 )

經(jīng)朋友提醒，轉(zhuǎn)用py了，之前美賽的時候用過一點點，不太熟悉，從零開始吧

class?CQueue(object):

????def?__init__(self):

????????self.A=[]

????????self.B=[]

????def?appendTail(self,?value):

????????"""

????????:type?value:?int

????????:rtype:?None

????????"""

????????self.A.append(value)

????def?deleteHead(self):

????????"""

????????:rtype:?int

????????"""

????????if?self.B:?return?self.B.pop()

????????if?not?self.A:?return?-1;

????????while?self.A:

????????????self.B.append(self.A.pop())

????????return?self.B.pop()

#?Your?CQueue?object?will?be?instantiated?and?called?as?such:

#?obj?=?CQueue()

#?obj.appendTail(value)

#?param_2?=?obj.deleteHead()