2. Add Two Numbers

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LeetCode

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/**
 * Definition for singly-linked list.
 * public class ListNode {
 *     int val;
 *     ListNode next;
 *     ListNode(int x) { val = x; }
 * }
 */
class Solution {
    public ListNode addTwoNumbers(ListNode l1, ListNode l2) {
        ListNode dummyHead = new ListNode(-1);
        ListNode curr=dummyHead;
        int carry = 0;
        
        while(l1!=null || l2!=null){
            int x= l1==null?0:l1.val;
            int y= l2==null?0:l2.val;
            int sum=carry+x+y;
            carry=sum/10;
            curr.next=new ListNode(sum%10);
            curr=curr.next;
            if(l1!=null)l1=l1.next;
            if(l2!=null)l2=l2.next;
        }
        if(carry==1) curr.next=new ListNode(1);
        return dummyHead.next;
    }
}
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