## Andrunevchyn

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November 2016
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# LeetCode: 2. Add Two Numbers

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

```package problems.algorithm.twonumbers;

/*
* 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
*/
public class Solution {
public ListNode addTwoNumbers(ListNode l1, ListNode l2) {
ListNode result = new ListNode(0);
System.out.println(result);
return result;
}

private void add(ListNode listNode, ListNode l1, ListNode l2) {

int val1 = (l1 != null ? l1.val : 0);
int val2 = (l2 != null ? l2.val : 0);
int sum = listNode.val + val1 + val2;
listNode.val = sum % 10;

int fraction = sum / 10;

if (fraction != 0) {
listNode.next = new ListNode(fraction);
}

ListNode next1 = l1 != null ? l1.next : null;
ListNode next2 = l2 != null ? l2.next : null;
if (next1 != null || next2 != null) {
listNode.next = new ListNode(fraction);
}

}

public static void main(String[] args) {
ListNode l1 = new ListNode(2);
l1.next = new ListNode(4);
l1.next.next = new ListNode(3);

ListNode l2 = new ListNode(5);
l2.next = new ListNode(6);
l2.next.next = new ListNode(4);

Solution solution = new Solution();
}
}
```

and ListNode class

```package problems.algorithm.twonumbers;

public class ListNode {

int val;
ListNode next;

ListNode(int x) {
val = x;
}

@Override
public String toString() {
StringBuilder builder = new StringBuilder();
builder.append(val);
if (next != null) {
builder.append("->");
builder.append(next);
}
return builder.toString();
}
}```