Untitled

/*
class Node{
  int data;
  Node next;
  
  Node(int data){
    this.data = data;
    this.next = null;
  }
}
*/
class Solution{
  public Node addTwoLinkedList(Node head1,Node head2){
    //write your code here.
    int c = 0;
    ArrayList<Integer> arr = new ArrayList<>();
    while(head1 != null && head2 != null){
        // System.out.println(head1.data+" "+head2.data);
        int sum = head1.data+head2.data+c;
        if(sum>9){
            c=sum/10;
            sum %= 10;
        }
        else c = 0;
        arr.add(sum);
        head1 = head1.next;
        head2 = head2.next;
    }
    while(head1 != null && c != 0){
        int sum = head1.data+c;
        if(sum>9){
            c=sum/10;
            sum %= 10;
        }
        else c = 0;
        arr.add(sum);
        head1 = head1.next;

    }
    while(head2 != null && c!= 0){
       int sum = head2.data+c;
        if(sum>9){
            c=sum/10;
            sum %= 10;
        }
        else c = 0;
        arr.add(sum);
        head2 = head2.next;

    }
    Node ans = null;
    Node curr = null;
    for(Integer i:arr){
        Node n1 = new Node(i);
        if(ans ==  null){
            ans = n1;
            curr = ans;
        }
        else{
            curr.next = n1;
        }
        curr = n1;
        
    }
    while(c!=0){
        
        Node n1 = new Node(c%10);
        c/=10;
        if(ans ==  null){
            ans = n1;
            curr = ans;
        }
        else{
            curr.next = n1;
        }
        curr = n1;
    }
    return ans;
  }
}