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Reverse Linked List II

Understand how to reverse a segment of a singly linked list between two specified positions using efficient in-place manipulation. This lesson guides you through the problem constraints and implementation to help you master linked list transformations commonly asked in coding interviews.

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Statement

Given a singly linked list with nn nodes and two positions, left and right, the objective is to reverse the nodes of the list from left to right. Return the modified list.

Constraints:

  • 1≤1 \leq n ≤500\leq 500
  • −5000≤-5000 \leq node.val ≤5000\leq 5000
  • 1≤1 \leq left ≤\leq right ≤\leq n

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:

Reverse Linked List II

1.

What is the output if the following linked list and left and right values are given as input?

linked list = 8 → 0 → 6 → 1 → 0 → 7 → 8 → 2

left = 1, right = 5

A.

2 → 8 → 7 → 0 → 1 → 6 → 0 → 8

B.

8 → 0 → 6 → 2 → 8 → 7 → 0 → 1

C.

0 → 1 → 6 → 0 → 8 → 7 → 8 → 2

D.

0 → 8 → 6 → 1 → 0 → 7 → 8 → 2

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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.

Java
usercode > Solution.java
// Definition for a Linked List node
// class ListNode {
//     int val;
//     ListNode next;
//     // Constructor
//     public ListNode(int val) {
//         this.val = val;
//         this.next = null;
//     }
// }
import ds_v1.LinkedList.ListNode;
import java.util.*;
public class Solution
{
    public static ListNode reverseBetween(ListNode head, int left, int right)
    {
        // Replace this placeholder return statement with your code
        return head;
    }
}
Reverse Linked List II