Closed chengchengxu15 closed 3 years ago
class MyCircularQueue:
def __init__(self, k: int):
"""
Initialize your data structure here. Set the size of the queue to be k.
"""
self.queue = [0]*k
self.headIndex = 0
self.count = 0
self.capacity = k
def enQueue(self, value: int) -> bool:
"""
Insert an element into the circular queue. Return true if the operation is successful.
"""
if self.count == self.capacity:
return False
self.queue[(self.headIndex + self.count) % self.capacity] = value
self.count += 1
return True
def deQueue(self) -> bool:
"""
Delete an element from the circular queue. Return true if the operation is successful.
"""
if self.count == 0:
return False
self.headIndex = (self.headIndex + 1) % self.capacity
self.count -= 1
return True
def Front(self) -> int:
"""
Get the front item from the queue.
"""
if self.count == 0:
return -1
return self.queue[self.headIndex]
def Rear(self) -> int:
"""
Get the last item from the queue.
"""
# empty queue
if self.count == 0:
return -1
return self.queue[(self.headIndex + self.count - 1) % self.capacity]
def isEmpty(self) -> bool:
"""
Checks whether the circular queue is empty or not.
"""
return self.count == 0
def isFull(self) -> bool:
"""
Checks whether the circular queue is full or not.
"""
return self.count == self.capacity
# 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()
https://leetcode.com/problems/design-circular-queue/
solution: https://leetcode-cn.com/problems/design-circular-queue/solution/she-ji-xun-huan-dui-lie-by-leetcode/#comment