Day i do not know

746. Min Cost Climbing Stairs/746. Min Cost Climbing Stairs.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net6.0</TargetFramework>
+    <RootNamespace>_746._Min_Cost_Climbing_Stairs</RootNamespace>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

746. Min Cost Climbing Stairs/Program.cs

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+namespace _746._Min_Cost_Climbing_Stairs;
+
+internal class Program
+{
+    static void Main(string[] args)
+    {
+        Console.WriteLine(new Solution().MinCostClimbingStairs(new int[] { 1, 100, 1, 1, 1, 100, 1, 1, 100, 1 }));
+    }
+}

746. Min Cost Climbing Stairs/Solution.cs

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+namespace _746._Min_Cost_Climbing_Stairs;
+
+public class Solution
+{
+    public int MinCostClimbingStairs(int[] cost)
+    {
+        int prev = cost[0];
+        int cur = cost[1];
+        for(int i = 2; i < cost.Length; i++)
+        {
+            int next = cost[i] + Math.Min(prev, cur);
+            prev = cur;
+            cur = next;
+        }
+        return Math.Min(prev, cur);
+    }
+}