Day6. Namespace style

589. N-ary Tree Preorder Traversal/Solution.cs

@@ -0,0 +1,22 @@
+namespace _589._N_ary_Tree_Preorder_Traversal;
+
+public class Solution
+{
+    public IList<int> Preorder(Node root)
+    {
+        List<int> list = new List<int>();
+        RecursiveTraversal(list, root);
+        return list;
+    }
+
+    private void RecursiveTraversal(List<int> output, Node cur)
+    {
+        if (cur == null)
+            return;
+        output.Add(cur.val);
+        if (cur.children == null)
+            return;
+        foreach (var child in cur.children)
+            RecursiveTraversal(output, child);
+    }
+}