Linked ListEasyLeetCode #234

17. Check Palindrome Linked List ⭐

Finds middle using slow/fast, reverses second half, and compares values from both ends simultaneously.

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

AmazonMicrosoft

Reference implementation (Python)

def is_palindrome(head):
    slow = fast = head
    while fast and fast.next:
        slow, fast = slow.next, fast.next.next
    # Reverse second half
    prev, curr = None, slow
    while curr:
        curr.next, prev, curr = prev, curr, curr.next
    # Compare halves
    left, right = head, prev
    while right:
        if left.val != right.val: return False
        left, right = left.next, right.next
    return True

Embed this visualization

Drop a live, looping 17. Check Palindrome Linked List ⭐ canvas into a blog post or course page.

<iframe src="/embed/palindrome-linked-list" 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 17. Check Palindrome Linked List ⭐?

17. Check Palindrome Linked List ⭐ runs in O(n) time and O(1) auxiliary space.

Is the 17. Check Palindrome Linked 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 17. Check Palindrome Linked List ⭐ in interviews?

17. Check Palindrome Linked List ⭐ shows up in interviews at Amazon, Microsoft.

How does the 3D visualization of 17. Check Palindrome Linked 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.