C:\Lang\dotnet\sdk\6.0.401\Sdks\Microsoft.NET.Sdk\targets\Microsoft.NET.Sdk.DefaultItems.targets(134,5): warning NETSDK1182: Targeting .NET 6.0 or higher in Visual Studio 2019 is not supported. [D:\cats-judge\run\csharp.csproj]
D:\cats-judge\run\7145013.cs(9,50): error CS1061: 'string[]' does not contain a definition for 'Select' and no accessible extension method 'Select' accepting a first argument of type 'string[]' could be found (are you missing a using directive or an assembly reference?) [D:\cats-judge\run\csharp.csproj]