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package leetcode;

/**

* Project Name : Leetcode

* Package Name : leetcode

* File Name : AddTwoNumbers

* Creator : Edward

* Date : Sep, 2017

* Description : 2. Add Two Numbers

*/

public class AddTwoNumbers {

/**

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

Output: 7 -> 0 -> 8

time : O(n)

space : O(n)

* @param l1

* @param l2

* @return

*/

public ListNode addTwoNumbers(ListNode l1, ListNode l2) {

ListNode dummy = new ListNode(0);

int sum = 0;

ListNode cur = dummy;

ListNode p1 = l1, p2 = l2;

while (p1 != null || p2 != null) {

if (p1 != null) {

sum += p1.val;

p1 = p1.next;

}

if (p2 != null) {

sum += p2.val;

p2 = p2.next;

}

cur.next = new ListNode(sum % 10);

sum /= 10;

cur = cur.next;

}

if (sum == 1) {

cur.next = new ListNode(1);

}

return dummy.next;

}

}