Common Elements in Array
Finds intersection between two arrays using hashing or pointers.
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Asked in interviews at
Reference implementation (Python)
def find_common_elements(a, b):
set_b = set(b)
return [x for x in a if x in set_b]Embed this visualization
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<iframe src="/embed/common-elements" 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 Common Elements in Array?
Common Elements in Array runs in O(n) time and O(n) auxiliary space.
Is the Common Elements in Array 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 Common Elements in Array in interviews?
Common Elements in Array shows up in interviews at Twitter, Meta, Snapchat.
How does the 3D visualization of Common Elements in Array 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.