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52 lines (42 loc) · 1020 Bytes
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232_Implement Queue using Stacks.py
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52 lines (42 loc) · 1020 Bytes
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# -*- coding: utf-8 -*-
"""
Created on Sun Feb 16 17:27:43 2020
@author: leiya
"""
class MyQueue:
def __init__(self):
"""
Initialize your data structure here.
"""
self.queue = []
def push(self, x: int) -> None:
"""
Push element x to the back of queue.
"""
self.queue.append(x)
def pop(self) -> int:
"""
Removes the element from in front of queue and returns that element.
"""
x = self.queue[0]
self.queue.pop(0)
return x
def peek(self) -> int:
"""
Get the front element.
"""
return self.queue[0]
def empty(self) -> bool:
"""
Returns whether the queue is empty.
"""
if self.queue:
return False
else:
return True
# Your MyQueue object will be instantiated and called as such:
# obj = MyQueue()
# obj.push(x)
# param_2 = obj.pop()
# param_3 = obj.peek()
# param_4 = obj.empty()