2 Add Two Numbers
// Java public ListNode addTwoNumbers(ListNode l1, ListNode l2) { return add(l1, l2, false); } private ListNode add(ListNode l1, ListNode l2, boolean step) { if (l1 == null && l2 == null && !step) return null; int i = l1 != null ? l1.val : 0; int j = l2 != null ? l2.val : 0; ListNode result; if (step) { result = new ListNode((i + j + 1) % 10); step = i + j + 1 >= 10; } else { result = new ListNode((i + j) % 10); step = i + j >= 10; } result.next = add(l1 == null ? null : l1.next, l2 == null ? null : l2.next, step); return result; } public class ListNode { int val; ListNode next; ListNode(int x) { val = x; } }
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