https://leetcode.com/problems/add-two-numbers/

public class Solution {
public ListNode addTwoNumbers(ListNode l1, ListNode l2) {
if(l1 == null) return l2;
if(l2 == null) return l1; ListNode head = new ListNode(0);
ListNode p = head; int tmp = 0;
while(l1!=null || l2!=null || tmp!=0) {
if(l1!=null){
tmp += l1.val;
l1 = l1.next;
}
if(l2!=null){
tmp += l2.val;
l2 = l2.next;
}
p.next = new ListNode(tmp%10);
p = p.next;
tmp = tmp/10;
}
return head.next;
}
}

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