LeetCode 2046: Sort Linked List Already Sorted Using Absolute Values Solution

Master LeetCode problem 2046 (Sort Linked List Already Sorted Using Absolute Values), a medium challenge, with our optimized solutions in Java, C++, and Python. Explore detailed explanations, test your code in our interactive editor, and prepare for coding interviews.

2046. Sort Linked List Already Sorted Using Absolute Values

Medium

Linked List Two Pointers Sorting

Problem Explanation

Explanation:

Given a singly linked list where elements are sorted based on absolute values, we need to sort the linked list based on actual values.

To achieve this, we can do the following:

Traverse the linked list and extract the values into an array while maintaining the original order.
Sort the array based on actual values.
Iterate through the linked list again and update the node values with the sorted array values. :

Solution Code

public ListNode sortLinkedList(ListNode head) {
    List<Integer> values = new ArrayList<>();
    ListNode curr = head;
    
    while (curr != null) {
        values.add(curr.val);
        curr = curr.next;
    }
    
    Collections.sort(values);
    
    curr = head;
    int index = 0;
    
    while (curr != null) {
        curr.val = values.get(index);
        index++;
        curr = curr.next;
    }
    
    return head;
}

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