Leetcode, Add Two Numbers, Programming, Leetcode Medium, Java.
ListNode addTwoNumbers(ListNode l1, ListNode l2, int carry) { if (l1 == null && l2 == null && carry == 0) { // Base case: if all are null and no carry, return null return null; } int sum = carry; // Start with the carry value if (l1 != null) { sum += l1.val; // Add the value of the current node in