1171. Remove Zero Sum Consecutive Nodes from Linked List

/**
 * Definition for singly-linked list.
 * public class ListNode {
 *     int val;
 *     ListNode next;
 *     ListNode() {}
 *     ListNode(int val) { this.val = val; }
 *     ListNode(int val, ListNode next) { this.val = val; this.next = next; }
 * }
 */
class Solution {
    public ListNode removeZeroSumSublists(ListNode head) 
    {

        if(head == null)
        {
            return head;

        }

        int sum=0;
        ListNode dummy = head;
        while(dummy != null)
        {

            sum += dummy.val;

            if(sum == 0)
            {
                head = dummy.next;

            }

            dummy = dummy.next;

        }

        if(head != null)
        {
            head.next = removeZeroSumSublists(head.next);

        }

        return head;




        
    }
}