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Add Two Numbers.java
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36 lines (36 loc) · 862 Bytes
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/**
* Definition for singly-linked list.
* public class ListNode {
* int val;
* ListNode next;
* ListNode(int x) { val = x; }
* }
*/
class Solution {
public ListNode addTwoNumbers(ListNode l1, ListNode l2) {
ListNode ans = new ListNode(-1);
ListNode curr = ans;
int carry = 0;
while (l1 != null || l2 != null || carry > 0) {
int temp = carry;
if (l1 != null && l2 != null) {
temp += l1.val + l2.val;
l1 = l1.next;
l2 = l2.next;
}
else if (l1 != null && l2 == null) {
temp += l1.val;
l1 = l1.next;
}
else if (l1 == null && l2 != null) {
temp += l2.val;
l2 = l2.next;
}
carry = temp > 9 ? temp / 10 : 0;
temp = temp % 10;
curr.next = new ListNode(temp);
curr = curr.next;
}
return ans.next;
}
}