algorithm-in-python/dataStructure/circularQueue.py

''' mbinary
#########################################################################
# File : circularQueue.py
# Author: mbinary
# Mail: zhuheqin1@gmail.com
# Blog: https://mbinary.xyz
# Github: https://github.com/mbinary
# Created Time: 2019-04-16  09:41
# Description:
#########################################################################
'''


class MyCircularQueue:

    def __init__(self, k):
        """
        Initialize your data structure here. Set the size of the queue to be k.
        :type k: int
        """
        self.size = k+1
        self.data = [0]*self.size
        self.head = self.rear = 0

    def enQueue(self, value):
        """
        Insert an element into the circular queue. Return true if the operation is successful.
        :type value: int
        :rtype: bool
        """
        if self.isFull():
            return False
        self.data[self.rear] = value
        self.rear = (self.rear+1) % self.size
        return True

    def deQueue(self):
        """
        Delete an element from the circular queue. Return true if the operation is successful.
        :rtype: bool
        """
        if self.isEmpty():
            return False
        self.head = (self.head+1) % self.size
        return True

    def Front(self):
        """
        Get the front item from the queue.
        :rtype: int
        """
        if self.isEmpty():
            return -1
        return self.data[self.head]

    def Rear(self):
        """
        Get the last item from the queue.
        :rtype: int
        """
        if self.isEmpty():
            return -1
        return self.data[(self.rear-1) % self.size]

    def isEmpty(self):
        """
        Checks whether the circular queue is empty or not.
        :rtype: bool
        """
        return self.head == self.rear

    def isFull(self):
        """
        Checks whether the circular queue is full or not.
        :rtype: bool
        """
        return (self.head - self.rear) % self.size == 1


# Your MyCircularQueue object will be instantiated and called as such:
# obj = MyCircularQueue(k)
# param_1 = obj.enQueue(value)
# param_2 = obj.deQueue()
# param_3 = obj.Front()
# param_4 = obj.Rear()
# param_5 = obj.isEmpty()
# param_6 = obj.isFull()