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36 lines (36 loc) · 969 Bytes
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Add Two Numbers.java
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36 lines (36 loc) · 969 Bytes
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/**
* Definition for singly-linked list.
* public class ListNode {
* int val;
* ListNode next;
* ListNode() {}
* ListNode(int val) { this.val = val; }
* ListNode(int val, ListNode next) { this.val = val; this.next = next; }
* }
*/
class Solution {
public ListNode addTwoNumbers(ListNode l1, ListNode l2) {
ListNode root = new ListNode(-1);
ListNode curr = root;
int carry = 0;
while (l1 != null || l2 != null || carry != 0) {
int currSum = carry;
if (l1 != null && l2 != null) {
currSum += l1.val + l2.val;
l1 = l1.next;
l2 = l2.next;
} else if (l1 != null && l2 == null) {
currSum += l1.val;
l1 = l1.next;
} else if (l1 == null && l2 != null) {
currSum += l2.val;
l2 = l2.next;
}
carry = currSum > 9 ? 1 : 0;
currSum %= 10;
curr.next = new ListNode(currSum);
curr = curr.next;
}
return root.next;
}
}