1670.设计前中后队列.py

#
# @lc app=LeetCode.cn id=1670 lang=python3
#
# [1670] 设计前中后队列
#

# @lc code=start
class FrontMiddleBackQueue:

    def __init__(self):


    def pushFront(self, val: int) -> None:


    def pushMiddle(self, val: int) -> None:


    def pushBack(self, val: int) -> None:


    def popFront(self) -> int:


    def popMiddle(self) -> int:


    def popBack(self) -> int:



# Your FrontMiddleBackQueue object will be instantiated and called as such:
# obj = FrontMiddleBackQueue()
# obj.pushFront(val)
# obj.pushMiddle(val)
# obj.pushBack(val)
# param_4 = obj.popFront()
# param_5 = obj.popMiddle()
# param_6 = obj.popBack()
# @lc code=end