Interactive Python Lab

Queue Operations

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Samjhein·Line by line

Replay·Step by step

Challenge·Guided prompts

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Data Flow Pipeline

intermediate Track

Binary Search

Selection Sort

Stack Operations

Insertion Sort

Hash Map Counting

Two Pointers

Queue Operations

Anagram Check

Sliding Window Max Sum

Merge Sorted Arrays

Samjhein

Line 1

Import deque

Yeh approach kyun?

We import deque from collections because it's optimized for queue operations. Unlike list.pop(0) which is O(n), deque.popleft() is O(1) — it maintains pointers to both ends.

Structured Explanation

Overview

Queue FIFO structure hai — first in, first out. Python mein collections.deque ya queue.Queue use karo.

Analogy

Jaise bus stand ki line — jo pehle aaya, pehle baitha.

Step-by-step

from collections import deque
q = deque() se empty queue
q.append(x) se enqueue (right side)
q.popleft() se dequeue (left side)

Visual

q = deque() q.append(1) # deque([1]) q.append(2) # deque([1, 2]) q.popleft() # 1, deque([2])

Common mistakes

List se queue — list.pop(0) O(n) hai, deque.popleft() O(1) hai
Queue empty check: len(q) == 0 ya bool(q)
Thread safety ke liye queue.Queue use karo

Practice questions

BFS ke liye queue use karo
Circular queue implement karo

Complexity

Time

O(1) per operation

Space

O(n)

Complexity Overview

O(1)time

O(log n)

O(n)space

O(n log n)

O(n²)

n = 8range 1-20

N = 8 pe

Complexity	Operations
O(1)	1
O(log n)	3
O(n)	8
O(n log n)	24
O(n²)	64

Challenge

Deque se queue implement karo. Print queue simulate karo: 5 jobs enqueue karo, FIFO order mein dequeue.

Hint

collections.deque use karo. Enqueue ke liye appendleft(), dequeue ke liye pop().

Code Studio

Queue Operations

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Python ready hai

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Output Console

3 lines

❯ Queue: ['Alice', 'Bob', 'Charlie']

❯ Removed: Alice Bob

❯ Remaining: ['Charlie']

Real-World Applications

1

Message brokers (RabbitMQ/Kafka)

2

Rate limiting network requests

3

Asynchronous task workers

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