Longest Subarray with Sum 0
Tracks prefix sum and first seen index in hash map.
Live loop — open the studio to scrub, add your own array, or race it in Battle Arena.
Asked in interviews at
Reference implementation (Python)
def max_len_zero_sum(arr):
seen = {0: -1}
max_len = s = 0
for i, x in enumerate(arr):
s += x
if s in seen:
max_len = max(max_len, i - seen[s])
else:
seen[s] = i
return max_lenEmbed this visualization
Drop a live, looping Longest Subarray with Sum 0 canvas into a blog post or course page.
<iframe src="/embed/longest-subarray-zero-sum" 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 Longest Subarray with Sum 0?
Longest Subarray with Sum 0 runs in O(n) time and O(n) auxiliary space.
Is the Longest Subarray with Sum 0 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 Longest Subarray with Sum 0 in interviews?
Longest Subarray with Sum 0 shows up in interviews at Atlassian, Shopify, LinkedIn.
How does the 3D visualization of Longest Subarray with Sum 0 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.