Remove Linked List Elements Java Program - The Coding Shala

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Remove Linked List Elements

Remove all elements from a linked list of integers that have value val.

Example:

Input:  1->2->6->3->4->5->6, val = 6

Output: 1->2->3->4->5

Remove Linked List Elements Java Program

Approach:

Remove head if match and iterate through the linked list if match skips that node.

Java Code 

/**
 * Definition for singly-linked list.
 * public class ListNode {
 *     int val;
 *     ListNode next;
 *     ListNode(int x) { val = x; }
 * }
 */
class Solution {
    public ListNode removeElements(ListNode head, int val) {
        while(head != null && head.val == val) head = head.next;
        if(head == null) return null;
        
        ListNode curr = head;
        while(curr.next != null){
            if(curr.next.val == val){
                curr.next = curr.next.next;
            }else{
                curr = curr.next;
            }
        }
        return head;
    }
}

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