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Grokking the Coding Interview Patterns in Go

Reverse Linked List

Explore how to reverse a singly linked list in-place and return its updated head. Understand problem constraints, validate your approach with quizzes, and implement the solution effectively using linked list manipulation techniques.

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Statement

Given the head of a singly linked list, reverse the linked list and return its updated head.

Constraints:

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

  • 1≤1 \leq n ≤500\leq 500
  • −5000≤-5000 \leq Node.Value ≤5000\leq 5000

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:

Technical Quiz
1.

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

4 → 2 → 7 → 8 → 9 → 0 → 2

A.

9 → 0 → 2 → 8 → 4 → 2 → 7

B.

7 → 2 → 4 → 8 → 2 → 0 → 9

C.

2 → 0 → 9 → 8 → 7 → 2 → 4

D.

0 → 2 → 2 → 4 → 8 → 9

1 / 4

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
5

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 reverse(head *ListNode) *ListNode {

	

	// Replace this placeholder return statement with your code

	

	return new(ListNode)

}
Reverse Linked List