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Grokking the Coding Interview Patterns in JavaScript

Remove Nth Node from End of List

Explore how to remove the nth node from the end of a singly linked list using the Two Pointers pattern. Learn to solve this common coding interview question in just one pass and practice coding your solution.

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Statement

Given the head of a singly linked list, remove the nthn^{th} node from the end of the list and return the head of the modified list.

Note: Could you solve this in a single pass through the list?

Constraints:

  • The number of nodes in the list is sz

  • 1≤1 \leq sz ≤30\leq 30

  • 0≤0 \leq Node.val ≤100\leq 100

  • 1≤1 \leq n ≤\leq sz≤k\leq k

Examples

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Understand the problem

Let’s take a moment to make sure you’ve correctly understood the problem. The quiz below helps you check if you’re solving the correct problem:

Remove Nth Node From End of List

1.

Given the linked list 42 → 88 → 15 and n = 2, what is the resulting linked list after removing the nth node from the end?

A.

[42, 15]

B.

[42, 88]

C.

[88, 15]

D.

[42, 88, 15]

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Figure it out!

We have a game for you to play. Rearrange the logical building blocks to develop a clearer understanding of how to solve this problem.

Sequence - Vertical
Drag and drop the cards to rearrange them in the correct sequence.
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Try it yourself

Implement your solution in the following coding playground.

Need a nudge?

Explore these hints—each one is designed to guide you a step closer to the solution.

JavaScript
usercode > Solution.js
// Definition for a Linked List node

// class ListNode {

//     constructor(val = 0, next = null) {

//         this.val = val;

//         this.next = next;

//     }

// }

import {ListNode} from './ds_v1/LinkedList.js';



function removeNthLastNode(head, n) {



    // Replace this placeholder return statement with your code

    return head;  

}



export {

  removeNthLastNode

};
Remove Nth Node from End of List