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AddTwoNumbers.java

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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.

*

* Input: (2 -> 4 -> 3) + (5 -> 6 -> 4)

*

* Output: 7 -> 0 -> 8

*/

public class AddTwoNumbers {

public ListNode addTwoNumbers(ListNode l1, ListNode l2) {

if (l1 == null)

return l2;

if (l2 == null)

return l1;

ListNode head = new ListNode(0);

ListNode cur = head;

int plus = 0;

while (l1 != null && l2 != null) {

int sum = l1.val + l2.val + plus;

plus = sum / 10;

sum = sum % 10;

cur.next = new ListNode(sum);

cur = cur.next;

l1 = l1.next;

l2 = l2.next;

}

if (l1 != null) {

if (plus != 0) {

cur.next = addTwoNumbers(l1, new ListNode(plus));

} else {

cur.next = l1;

}

} else if (l2 != null) {

if (plus != 0) {

cur.next = addTwoNumbers(l2, new ListNode(plus));

} else {

cur.next = l2;

}

} else if (plus != 0) {

cur.next = new ListNode(plus);

}

return head.next;

}

}