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Grokking the Coding Interview Patterns in C#

Solution: Delete N Nodes After M Nodes of a Linked List

Understand how to efficiently manipulate a linked list by retaining M nodes and deleting the following N nodes repeatedly until the end. This lesson teaches step-by-step traversal, node retention and deletion, and reconnecting nodes to modify the list with optimal time and space complexity.

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Statement

Given the head of a linked list and two integers, m and n, remove some specific nodes from the list and return the head of the modified, linked list. The list should be traversed, and nodes removed as follows:

  1. Start with the head node and set it as the current node.

  2. Traverse the next m nodes from the current node without deleting them.

  3. Traverse the next n nodes and delete them.

  4. Repeat steps 2 and 3 above until the end of the linked list is reached.

Constraints:

  • 1≤1 \leq Node ≤103\leq 10^3 ...