Deque (Double-Ended Queue)
Allows insertion and deletion of elements in O(1) from both the front and back ends.
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Asked in interviews at
Reference implementation (Python)
from collections import deque
d = deque()
d.append(20) # push back
d.appendleft(10) # push front
d.pop() # pop back
d.popleft() # pop frontEmbed this visualization
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<iframe src="/embed/deque-operations" width="100%" height="380" style="border:1px solid #e6e8ec;border-radius:14px" loading="lazy" title="3D algorithm visualization by CodeWithMunnaX"></iframe>Frequently asked
What is the time and space complexity of Deque (Double-Ended Queue)?
Deque (Double-Ended Queue) runs in O(1) time and O(n) auxiliary space.
Is the Deque (Double-Ended Queue) visualizer free?
The core 3D visualizer, Web Audio chimes and step intuition are free. A one-time ₹49 Pro Pass unlocks advanced algorithms, large custom arrays, Battle Arena and reel export.
Which companies ask Deque (Double-Ended Queue) in interviews?
Deque (Double-Ended Queue) shows up in interviews at Google, Oracle.
How does the 3D visualization of Deque (Double-Ended Queue) work?
Each array value becomes a 3D pillar whose height maps to its value. Comparisons glow amber, swaps flash red, and settled elements lock green while a floating pointer badge tracks the active index — synchronized line-by-line with the Python code.