Add Two Numbers
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You are given two linked lists representing two non-negative numbers. The digits are stored in reverse order and each of their nodes contain a single digit. Add the two numbers and return it as a linked list.
*Input: (2 -> 4 -> 3) + (5 -> 6 -> 4)
*Output: 7 -> 0 -> 8
/**
* Definition for singly-linked list.
* public class ListNode {
* int val;
* ListNode next;
* ListNode(int x) { val = x; }
* }
*/
public class Solution {
public ListNode addTwoNumbers(ListNode l1, ListNode l2) {
ListNode newLink= new ListNode(0);
ListNode current=newLink;
int carry =0;
while (l1 != null || l2 != null) {
int a1 = (l1 == null) ? 0 : l1.val;
int a2 = (l2 == null) ? 0 : l2.val;
int sum = a1 + a2 + carry;
carry = sum / 10;
current.next = new ListNode(sum % 10);
l1 = (l1 == null) ? null : l1.next;
l2 = (l2 == null) ? null : l2.next;
current = current.next;
}
if (carry > 0) {
current.next = new ListNode(carry);
}
return newLink.next;
}
}