From b59f949d8f46dc95c573a9e3f8a7d60742146e02 Mon Sep 17 00:00:00 2001
From: Matej Focko <mfocko@redhat.com>
Date: Sat, 23 Jul 2022 13:11:02 +0200
Subject: [PATCH] problems: add n-ary tree preorder traversal

Signed-off-by: Matej Focko <mfocko@redhat.com>
---
 problems/n-ary-tree-preorder-traversal.cpp | 43 ++++++++++++++++++++++
 1 file changed, 43 insertions(+)
 create mode 100644 problems/n-ary-tree-preorder-traversal.cpp

diff --git a/problems/n-ary-tree-preorder-traversal.cpp b/problems/n-ary-tree-preorder-traversal.cpp
new file mode 100644
index 0000000..ee66ae8
--- /dev/null
+++ b/problems/n-ary-tree-preorder-traversal.cpp
@@ -0,0 +1,43 @@
+/*
+// Definition for a Node.
+class Node {
+public:
+    int val;
+    vector<Node*> children;
+
+    Node() { }
+
+    Node(int _val)
+    {
+        val = _val;
+    }
+
+    Node(int _val, vector<Node*> _children)
+    {
+        val = _val;
+        children = _children;
+    }
+};
+*/
+
+class Solution {
+    void preorder(vector<int>& traversal, Node* root)
+    {
+        if (root == nullptr) {
+            return;
+        }
+
+        traversal.push_back(root->val);
+        for (auto child : root->children) {
+            preorder(traversal, child);
+        }
+    }
+
+public:
+    vector<int> preorder(Node* root)
+    {
+        vector<int> result;
+        preorder(result, root);
+        return result;
+    }
+};