LeetCode 3063: Linked List Frequency Solution

Master LeetCode problem 3063 (Linked List Frequency), a easy 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.

3063. Linked List Frequency

Easy

Hash Table Linked List Counting

Problem Explanation

Explanation

To solve this problem, we need to count the frequency of each element in a linked list and return the result as a list of integers. We can achieve this by iterating through the linked list and using a hashmap to store the frequency of each element. Finally, we can extract the frequency values from the hashmap and return them as a list.

Create a hashmap to store the frequency of elements.
Iterate through the linked list and update the frequency in the hashmap.
Extract the frequency values from the hashmap and return them as a list.

Time Complexity: O(N) where N is the number of elements in the linked list. Space Complexity: O(N) for the hashmap.

Solution Code

import java.util.*;

class Solution {
    public List<Integer> linkedListFrequency(ListNode head) {
        Map<Integer, Integer> frequencyMap = new HashMap<>();
        List<Integer> result = new ArrayList<>();

        ListNode current = head;
        while (current != null) {
            frequencyMap.put(current.val, frequencyMap.getOrDefault(current.val, 0) + 1);
            current = current.next;
        }

        for (int value : frequencyMap.values()) {
            result.add(value);
        }

        return result;
    }
}

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