Day i do not know

104. Maximum Depth of Binary Tree/104. Maximum Depth of Binary Tree.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net6.0</TargetFramework>
+    <RootNamespace>_104._Maximum_Depth_of_Binary_Tree</RootNamespace>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

104. Maximum Depth of Binary Tree/Program.cs

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+namespace _104._Maximum_Depth_of_Binary_Tree;
+
+internal class Program
+{
+    static void Main(string[] args)
+    {
+        Console.WriteLine("Hello, World!");
+    }
+}

104. Maximum Depth of Binary Tree/Solution.cs

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+namespace _104._Maximum_Depth_of_Binary_Tree;
+
+public class Solution
+{
+    public int MaxDepth(TreeNode root)
+    {
+        var res = Recursion(0, root);
+        if (root != null)
+            res++;
+        return res;
+    }
+
+    private int Recursion(int count, TreeNode node)
+    {
+        if(node == null)
+            return 0;
+        var list = new List<int>();
+        if (node.left != null)
+            list.Add(Recursion(count + 1, node.left));
+        if (node.right != null)
+            list.Add(Recursion(count + 1, node.right));
+        if (list.Count > 0)
+            return list.Max();
+        return count;
+    }
+}

104. Maximum Depth of Binary Tree/TreeNode.cs

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+namespace _104._Maximum_Depth_of_Binary_Tree;
+
+
+//Definition for a binary tree node.
+public class TreeNode {
+    public int val;
+    public TreeNode? left;
+    public TreeNode? right;
+    public TreeNode(int val=0, TreeNode? left=null, TreeNode? right =null) {
+        this.val = val;
+        this.left = left;
+        this.right = right;
+    }
+}
+