LeetCode 3217: Delete Nodes From Linked List Present in Array Solution

Master LeetCode problem 3217 (Delete Nodes From Linked List Present in Array), 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.

3217. Delete Nodes From Linked List Present in Array

Medium

Array Hash Table Linked List

Problem Explanation

Explanation

To solve this problem, we can iterate through the linked list while keeping track of the nodes that need to be deleted. We can use a HashSet to store the values from the given array for efficient lookups. While iterating through the linked list, if we encounter a node with a value that exists in the HashSet, we skip that node by updating the previous node's next pointer. At the end, we return the head of the modified linked list.

Time complexity: O(N) where N is the number of nodes in the linked list.
Space complexity: O(M) where M is the number of distinct values in the array.

Solution Code

public ListNode deleteNodesFromLinkedList(int[] nums, ListNode head) {
    Set<Integer> set = new HashSet<>();
    for (int num : nums) {
        set.add(num);
    }
    
    ListNode dummy = new ListNode(0);
    dummy.next = head;
    ListNode prev = dummy;
    ListNode curr = head;
    
    while (curr != null) {
        if (set.contains(curr.val)) {
            prev.next = curr.next;
        } else {
            prev = curr;
        }
        curr = curr.next;
    }
    
    return dummy.next;
}

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