Linked ListMedium

20. Remove Duplicates (Sorted List)

Iterates through the sorted list, skipping adjacent nodes with identical values.

Time O(n) Space O(1)

Live loop — open the studio to scrub, add your own array, or race it in Battle Arena.

Asked in interviews at

NetflixAmazonByteDance

Reference implementation (Python)

def delete_duplicates(head):
    curr = head
    while curr and curr.next:
        if curr.val == curr.next.val:
            curr.next = curr.next.next
        else:
            curr = curr.next
    return head

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<iframe src="/embed/remove-duplicates-ll" 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 20. Remove Duplicates (Sorted List)?

20. Remove Duplicates (Sorted List) runs in O(n) time and O(1) auxiliary space.

Is the 20. Remove Duplicates (Sorted List) 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 20. Remove Duplicates (Sorted List) in interviews?

20. Remove Duplicates (Sorted List) shows up in interviews at Netflix, Amazon, ByteDance.

How does the 3D visualization of 20. Remove Duplicates (Sorted List) 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.