package q2

type ListNode struct {
	Val  int
	Next *ListNode
}

func addTwoNumbers(l1 *ListNode, l2 *ListNode) *ListNode {
	retRoot := &ListNode{}

	p := retRoot
	carry := 0
	for l1 != nil || l2 != nil {
		val := carry
		if l1 != nil {
			val += l1.Val
			l1 = l1.Next
		}
		if l2 != nil {
			val += l2.Val
			l2 = l2.Next
		}

		carry, val = val/10, val%10
		node := &ListNode{Val: val}
		p.Next = node
		p = node
	}
	if carry > 0 {
		p.Next = &ListNode{Val: carry}
	}
	return retRoot.Next
}

var _ = addTwoNumbers