[LeetCode] 2. Add Two Numbers - Java

• 문제 링크

Add Two Numbers - LeetCode

 

• 풀이 코드

public class Solution {

    public ListNode addTwoNumbers(ListNode l1, ListNode l2) {
        ListNode dummy = new ListNode(-1), node = dummy;
        int carry = 0;
        while (l1 != null || l2 != null) {
            node = node.next = new ListNode(carry);
            if (l1 != null) {
                node.val += l1.val;
                l1 = l1.next;
            }
            if (l2 != null) {
                node.val += l2.val;
                l2 = l2.next;
            }
            carry = node.val / 10;
            node.val = node.val % 10;
        }
        if (carry != 0) node.next = new ListNode(carry);

        return dummy.next;
    }

}

/*public class ListNode {
    int val;
    ListNode next;

    ListNode(int val) {
        this.val = val;
    }
}*/