add new solutions

solutions/1/q129/solution.go

@@ -0,0 +1,33 @@
+package q129
+
+type TreeNode struct {
+	Val   int
+	Left  *TreeNode
+	Right *TreeNode
+}
+
+func sumNums(node *TreeNode, prefix int) int {
+	prefix = prefix*10 + node.Val
+
+	if node.Left == nil && node.Right == nil {
+		return prefix
+	}
+
+	sum := 0
+	if node.Left != nil {
+		sum += sumNums(node.Left, prefix)
+	}
+	if node.Right != nil {
+		sum += sumNums(node.Right, prefix)
+	}
+	return sum
+}
+
+func sumNumbers(root *TreeNode) int {
+	if root == nil {
+		return 0
+	}
+	return sumNums(root, 0)
+}
+
+var _ = sumNumbers