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Grokking the Coding Interview Patterns in Go

Middle of the Linked List

Understand and apply fast and slow pointer methods to find the middle node in a singly linked list. This lesson helps you solve the problem efficiently, even when the list has an even number of nodes, ensuring you return the correct middle element.

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Statement

Given the head of a singly linked list, return the middle node of the linked list. If the number of nodes in the linked list is even, there will be two middle nodes, so return the second one.

Constraints:

Let n be the number of nodes in a linked list.

  • 1≤1 \leq n ≤100\leq 100
  • 1≤1 \leq Node.Value ≤100\leq 100
  • head ≠\neq NULL

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:

Middle of the Linked List

1.

What is the output if the following linked list is given as input?

2 → 4 → 6 → 8 → 10 → NULL

A.

4

B.

6

C.

2

D.

8

1 / 3

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.
1
2
3
4

Try it yourself

Implement your solution in the following coding playground.

Go
usercode > Solution.go
// Definition for a Linked List node



// type ListNode struct {

// 	Val  int

// 	Next *ListNode

// }



package main

import (. "golang-test-code/ds_v1/LinkedList")



func getMiddleNode(head *ListNode) *ListNode {



	// Replace this placeholder return statement with your code

	return new(ListNode)

}
Middle of the Linked List