add new solutions

solutions/1/q117/solution.go

@@ -0,0 +1,34 @@
+package q117
+
+type Node struct {
+	Val   int
+	Left  *Node
+	Right *Node
+	Next  *Node
+}
+
+func walk(node *Node, depth int, depths *[]*Node) {
+	if node == nil {
+		return
+	}
+
+	if depth > len(*depths) {
+		*depths = append(*depths, nil)
+	}
+	if (*depths)[depth-1] != nil {
+		(*depths)[depth-1].Next = node
+	}
+	(*depths)[depth-1] = node
+
+	walk(node.Left, depth+1, depths)
+	walk(node.Right, depth+1, depths)
+}
+
+func connect(root *Node) *Node {
+	depths := []*Node{}
+	walk(root, 1, &depths)
+
+	return root
+}
+
+var _ = connect