Day i do not know

112. Path Sum/112. Path Sum.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net6.0</TargetFramework>
+    <RootNamespace>_112._Path_Sum</RootNamespace>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

112. Path Sum/Program.cs

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+namespace _112._Path_Sum;
+
+internal class Program
+{
+    static void Main(string[] args)
+    {
+        Console.WriteLine("Hello, World!");
+    }
+}

112. Path Sum/Solution.cs

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+namespace _112._Path_Sum;
+
+public class Solution
+{
+    public bool HasPathSum(TreeNode root, int targetSum) 
+        => root != null ? Recursion(root, root.val, targetSum) : false;
+
+    private bool Recursion(TreeNode? node, int curSum, int targetSum)
+    {
+        if (curSum == targetSum && node != null && node.left == null && node.right == null)
+            return true;
+        if (node == null)
+            return false;
+        bool res = false;
+        if(node.left != null)
+            res |= Recursion(node.left, curSum + node.left.val, targetSum);
+        if (node.right != null)
+            res |= Recursion(node.right, curSum + node.right.val, targetSum);
+        return res;
+    }
+}

112. Path Sum/TreeNode.cs

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+namespace _112._Path_Sum;
+
+
+//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;
+    }
+}