leetcode

INFO

冲！

2

/**
 * Definition for singly-linked list.
 * type ListNode struct {
 *     Val int
 *     Next *ListNode
 * }
 */
func addTwoNumbers(l1 *ListNode, l2 *ListNode) *ListNode {
    dummy := &ListNode{} // 使用哑节点简化操作
    current := dummy
    carry := 0
    
    for l1 != nil || l2 != nil || carry != 0 {
        sum := carry
        if l1 != nil {
            sum += l1.Val
            l1 = l1.Next
        }
        if l2 != nil {
            sum += l2.Val
            l2 = l2.Next
        }
        
        carry = sum / 10
        current.Next = &ListNode{Val: sum % 10}
        current = current.Next
    }
    
    return dummy.Next
}