Day i do not know

701. Insert into a Binary Search Tree/701. Insert into a Binary Search Tree.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net6.0</TargetFramework>
+    <RootNamespace>_701._Insert_into_a_Binary_Search_Tree</RootNamespace>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

701. Insert into a Binary Search Tree/Program.cs

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+namespace _701._Insert_into_a_Binary_Search_Tree;
+
+internal class Program
+{
+    static void Main(string[] args)
+    {
+        Console.WriteLine("Hello, World!");
+    }
+}

701. Insert into a Binary Search Tree/Solution.cs

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+namespace _701._Insert_into_a_Binary_Search_Tree;
+
+public class Solution
+{
+    public TreeNode InsertIntoBST(TreeNode root, int val)
+    {
+        if(root == null)
+            return new TreeNode(val);
+        TreeNode cur = root;
+        while(true)
+        {
+            int curVal = cur.val;
+            if(val < curVal)
+            {
+                if (cur.left == null)
+                {
+                    cur.left = new TreeNode(val);
+                    break;
+                }
+                cur = cur.left;
+            }
+            else
+            {
+                if (cur.right == null)
+                {
+                    cur.right = new TreeNode(val);
+                    break;
+                }
+                cur = cur.right;
+            }
+        }
+        return root;
+    }
+}

701. Insert into a Binary Search Tree/TreeNode.cs

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+namespace _701._Insert_into_a_Binary_Search_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;
+    }
+}
+