using System.Collections; namespace Codeforces.Test; public class FileNameGenerator : IEnumerable { private readonly string inputFolder = @"../../../Input"; public IEnumerator GetEnumerator() { foreach (var input in Directory.GetFiles(inputFolder)) { string name = Path.GetFileName(input); string output = $"../../../Output/{name}.a"; yield return new object[] { input, output }; } } IEnumerator IEnumerable.GetEnumerator() => GetEnumerator(); }