What are the implementation details of stacks and queues?

What are the implementation details of stacks and queues?

Stacks and queues are fundamental data structures. A stack follows Last In First Out (LIFO) principle, while a queue follows First In First Out (FIFO). Would you like to know how to implement them in a specific programming language?

Yes, can you show me how to implement them in Python?

Sure! For a stack, you can use a list and append/pop methods. For a queue, you can use collections.deque for efficient FIFO operations. Would you like code examples?

Yes, please provide the code examples.

Here's a simple stack implementation:

class Stack:
    def __init__(self):
        self.items = []
    def push(self, item):
        self.items.append(item)
    def pop(self):
        return self.items.pop() if not self.is_empty() else None
    def is_empty(self):
        return len(self.items) == 0

And for a queue:

from collections import deque
class Queue:
    def __init__(self):
        self.items = deque()
    def enqueue(self, item):
        self.items.append(item)
    def dequeue(self):
        return self.items.popleft() if not self.is_empty() else None
    def is_empty(self):
        return len(self.items) == 0

Thanks! Can you explain the time complexity of these operations?

Certainly! For both stacks and queues, the time complexity for push/enqueue and pop/dequeue operations is O(1), meaning they are very efficient. Would you like to know more about their applications?