更新题号

Algorithms/0002. Add-Two-Number/2. Add Two Numbers.go

@@ -0,0 +1,43 @@
+package leetcode
+
+/**
+ * Definition for singly-linked list.
+ * type ListNode struct {
+ *     Val int
+ *     Next *ListNode
+ * }
+ */
+func addTwoNumbers(l1 *ListNode, l2 *ListNode) *ListNode {
+	if l1 == nil || l2 == nil {
+		return nil
+	}
+	head := &ListNode{Val: 0, Next: nil}
+	current := head
+	carry := 0
+	for l1 != nil || l2 != nil {
+		var x, y int
+		if l1 == nil {
+			x = 0
+		} else {
+			x = l1.Val
+		}
+		if l2 == nil {
+			y = 0
+		} else {
+			y = l2.Val
+		}
+		current.Next = &ListNode{Val: (x + y + carry) % 10, Next: nil}
+		current = current.Next
+		carry = (x + y + carry) / 10
+		if l1 != nil {
+			l1 = l1.Next
+		}
+		if l2 != nil {
+			l2 = l2.Next
+		}
+	}
+	if carry > 0 {
+		current.Next = &ListNode{Val: carry % 10, Next: nil}
+	}
+	return head.Next
+}