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easyDSA

What is the difference between a stack and a queue?

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01

Understand the problem

Explain stack vs queue.

stackqueue
02

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03

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A stack is LIFO (last-in, first-out) — push/pop at one end; used for recursion, undo, and DFS. A queue is FIFO (first-in, first-out) — enqueue at the back, dequeue at the front; used for scheduling and BFS.

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04

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Stack and queue from a dynamic array
Run Playground
from collections import deque

stack = []
stack.append(1); stack.append(2)   # push
print(stack.pop())                 # 2 (LIFO)

queue = deque()
queue.append(1); queue.append(2)   # enqueue
print(queue.popleft())             # 1 (FIFO)
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