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Data Structures for Coding Interviews in Java

Challenge: Reverse Linked List

Explore how to reverse a singly linked list and return its updated head in Java. This lesson guides you through coding a solution that handles node values and size constraints, helping you master linked list manipulations critical for coding interviews.

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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 ≤5×102\leq 5\times10^2
  • −5×103≤-5\times10^3 \leq Node.value ≤5×103\leq 5\times10^3

Examples

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Try it yourself

Implement your solution in the following coding playground.

usercode > Solution.java
import ds_v1.LinkedList.LinkedListNode;
// class LinkedListNode<T> {
//     T data;
//     LinkedListNode<T> next;
//     LinkedListNode(T data) {
//         this.data = data;
//         this.next = null;
//     }
// }
public class Solution {
    public static LinkedListNode<Integer> reverse(LinkedListNode<Integer> head) {
        // Replace this placeholder return statement with your code
        return head;
    }
}
Reverse Linked List