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43 lines
1.1 KiB
43 lines
1.1 KiB
"""
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File: deque.py
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Created Time: 2022-11-29
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Author: Peng Chen (pengchzn@gmail.com)
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"""
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from collections import deque
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"""Driver Code"""
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if __name__ == "__main__":
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# 初始化双向队列
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deq: deque[int] = deque()
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# 元素入队
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deq.append(2) # 添加至队尾
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deq.append(5)
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deq.append(4)
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deq.appendleft(3) # 添加至队首
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deq.appendleft(1)
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print("双向队列 deque =", deq)
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# 访问元素
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front: int = deq[0] # 队首元素
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print("队首元素 front =", front)
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rear: int = deq[-1] # 队尾元素
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print("队尾元素 rear =", rear)
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# 元素出队
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pop_front: int = deq.popleft() # 队首元素出队
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print("队首出队元素 pop_front =", pop_front)
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print("队首出队后 deque =", deq)
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pop_rear: int = deq.pop() # 队尾元素出队
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print("队尾出队元素 pop_rear =", pop_rear)
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print("队尾出队后 deque =", deq)
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# 获取双向队列的长度
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size: int = len(deq)
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print("双向队列长度 size =", size)
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# 判断双向队列是否为空
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is_empty: bool = len(deq) == 0
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print("双向队列是否为空 =", is_empty)
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