Two Pointers (Two Sum)
Uses two pointers moving inward from both ends of a sorted array to locate a pair with a target sum in linear time.
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Asked in interviews at
Reference implementation (Python)
def two_sum_sorted(arr, target):
left = 0
right = len(arr) - 1
while left < right:
current_sum = arr[left] + arr[right]
if current_sum == target:
return [left, right]
elif current_sum < target:
left += 1
else:
right -= 1
return []Embed this visualization
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<iframe src="/embed/two-pointers" 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 Two Pointers (Two Sum)?
Two Pointers (Two Sum) runs in O(n) time and O(1) auxiliary space.
Is the Two Pointers (Two Sum) 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 Two Pointers (Two Sum) in interviews?
Two Pointers (Two Sum) shows up in interviews at Amazon, Meta, Google.
How does the 3D visualization of Two Pointers (Two Sum) 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.