//https://www.reddit.com/r/dailyprogrammer/comments/4jom3a/20160516_challenge_267_easy_all_the_places_your/

​

using System;

using System.Linq;

using System.Collections.Generic;

​

public class Program

{

    public static void Main(string[] args)

    {

        var totalPlaces = args != null && args.Length > 0 ? int.Parse(args[0]) : 200;

        var dogPlace = args != null && args.Length > 1 ? int.Parse(args[1]) : 3;

        Console.WriteLine(string.Join(", ", GetPlaces(totalPlaces, dogPlace)));

    }

    public static IEnumerable<string> GetPlaces(int maxPlace, int dogPlace)

    {

        string[] suffixes = new string[]{"th", "st", "nd", "rd"};

        return

            from place in Enumerable.Range(1, maxPlace)

            let lastTwoDigits = place % 100

            let isUniqueCase = (11 <= lastTwoDigits && lastTwoDigits <= 13)

            let lastDigit = place % 10

            let alwaysHasThSuffix = suffixes.Length <= lastDigit

            let suffixIndex = isUniqueCase | alwaysHasThSuffix ? 0 : lastDigit

            where place != dogPlace

            select place + suffixes[suffixIndex];

    }

}