Remove Nth Node from End of List
Explore the two pointers technique to remove the nth node from the end of a singly linked list in a single pass. This lesson teaches how to identify and implement an optimal solution for a common coding interview pattern, improving your problem-solving skills with linked lists and pointers in C++.
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Statement
Given the head of a singly linked list, remove 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
szszNode.valnsz
Examples
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
Given the linked list 42 → 88 → 15 and n = 2, what is the resulting linked list after removing the nth node from the end?
[42, 15]
[42, 88]
[88, 15]
[42, 88, 15]
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.
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.
// Definition for a Linked List node// class ListNode {// public:// int val;// ListNode* next;// // Constructor// ListNode(int val = 0, ListNode* next = nullptr);// };ListNode* RemoveNthLastNode(ListNode *head, int n){// Replace this placeholder return statement with your codereturn head;}