compile c# online

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using System;
using System.Linq;
using System.Globalization;

namespace Rextester {
public class Program
{

public static void Main(System.String[] args)
   	{
        var countries =
                from ci in CultureInfo.GetCultures(CultureTypes.SpecificCultures)
                group ci by new RegionInfo(ci.Name).EnglishName into g
                let fdows = (from ci in g select ci.DateTimeFormat.FirstDayOfWeek.ToString()).Distinct()
                // where fdows.Count() > 1
                from ci in g
                orderby g.Key
                select new { g.Key, ci.Name, ci.EnglishName, ci.DateTimeFormat.FirstDayOfWeek };

foreach (var ci in countries)
	   	{
      	  	var offset = ci.FirstDayOfWeek == DayOfWeek.Monday ? "" :
      	                 ci.FirstDayOfWeek == DayOfWeek.Sunday ? new string(' ', 7) :
      	                 ci.FirstDayOfWeek == DayOfWeek.Saturday ? new string(' ', 14) :
      	                 new string(' ', 21);
      	               
          	Console.WriteLine("{0,-60} {1}{2}", 
         			ci.EnglishName, 
         			offset,
         			ci.FirstDayOfWeek);
      };
   }

}
}

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Compilation time: 0.28 sec, absolute running time: 0.27 sec, cpu time: 0.19 sec, average memory usage: 22 Mb, average nr of threads: 5

Pashto (Afghanistan) Saturday Dari (Afghanistan) Saturday Albanian (Albania) Monday Central Atlas Tamazight (Latin, Algeria) Saturday Arabic (Algeria) Saturday Spanish (Argentina) Sunday Armenian (Armenia) Monday English (Australia) Monday German (Austria) Monday Azerbaijani (Latin, Azerbaijan) Monday Azerbaijani (Cyrillic, Azerbaijan) Monday Arabic (Bahrain) Saturday Bangla (Bangladesh) Sunday Belarusian (Belarus) Monday French (Belgium) Monday Dutch (Belgium) Monday English (Belize) Sunday Spanish (Bolivarian Republic of Venezuela) Sunday Quechua (Bolivia) Sunday Spanish (Bolivia) Sunday Croatian (Latin, Bosnia and Herzegovina) Monday Bosnian (Latin, Bosnia and Herzegovina) Monday Serbian (Latin, Bosnia and Herzegovina) Monday Serbian (Cyrillic, Bosnia and Herzegovina) Monday Bosnian (Cyrillic, Bosnia and Herzegovina) Monday Setswana (Botswana) Monday Portuguese (Brazil) Sunday Malay (Brunei Darussalam) Monday Bulgarian (Bulgaria) Monday Khmer (Cambodia) Sunday Inuktitut (Syllabics, Canada) Sunday Mohawk (Mohawk) Sunday Inuktitut (Latin, Canada) Sunday French (Canada) Sunday English (Canada) Sunday English (Caribbean) Monday Mapudungun (Chile) Sunday Spanish (Chile) Sunday Tibetan (China) Monday Yi (China) Monday Uyghur (China) Monday Chinese (Simplified, China) Monday Mongolian (Traditional Mongolian, China) Monday Spanish (Colombia) Monday Spanish (Costa Rica) Sunday Croatian (Croatia) Monday Czech (Czech Republic) Monday Danish (Denmark) Monday Spanish (Dominican Republic) Monday Quichua (Ecuador) Sunday Spanish (Ecuador) Monday Arabic (Egypt) Saturday Spanish (El Salvador) Sunday Tigrinya (Eritrea) Monday Estonian (Estonia) Monday Amharic (Ethiopia) Monday Tigrinya (Ethiopia) Monday Faroese (Faroe Islands) Monday Finnish (Finland) Monday Swedish (Finland) Monday Sami, Northern (Finland) Monday Sami, Skolt (Finland) Monday Sami, Inari (Finland) Monday French (France) Monday Breton (France) Monday Occitan (France) Monday Corsican (France) Monday Alsatian (France) Monday Georgian (Georgia) Monday German (Germany) Monday Upper Sorbian (Germany) Monday Lower Sorbian (Germany) Monday Greek (Greece) Monday Greenlandic (Greenland) Monday K'iche' (Guatemala) Monday Spanish (Guatemala) Monday Spanish (Honduras) Sunday Chinese (Traditional, Hong Kong SAR) Sunday Hungarian (Hungary) Monday Icelandic (Iceland) Monday Hindi (India) Monday Bangla (India) Monday Punjabi (India) Monday Gujarati (India) Monday Odia (India) Monday Tamil (India) Monday Telugu (India) Monday Kannada (India) Monday Malayalam (India) Monday Assamese (India) Monday Marathi (India) Monday Sanskrit (India) Sunday Konkani (India) Monday English (India) Monday Indonesian (Indonesia) Monday Persian Saturday Central Kurdish (Iraq) Sunday Arabic (Iraq) Saturday Irish (Ireland) Monday English (Ireland) Monday Hebrew (Israel) Sunday Italian (Italy) Monday English (Jamaica) Sunday Japanese (Japan) Sunday Arabic (Jordan) Saturday Kazakh (Kazakhstan) Monday Kiswahili (Kenya) Sunday Korean (Korea) Sunday Arabic (Kuwait) Saturday Kyrgyz (Kyrgyzstan) Monday Lao (Lao PDR) Monday Latvian (Latvia) Monday Arabic (Lebanon) Monday Arabic (Libya) Saturday German (Liechtenstein) Monday Lithuanian (Lithuania) Monday Luxembourgish (Luxembourg) Monday German (Luxembourg) Monday French (Luxembourg) Monday Chinese (Traditional, Macao SAR) Sunday Macedonian (Former Yugoslav Republic of Macedonia) Monday Malay (Malaysia) Monday English (Malaysia) Sunday Divehi (Maldives) Sunday Maltese (Malta) Monday Spanish (Mexico) Sunday Mongolian (Cyrillic, Mongolia) Monday Serbian (Latin, Montenegro) Monday Serbian (Cyrillic, Montenegro) Monday Central Atlas Tamazight (Tifinagh, Morocco) Monday Arabic (Morocco) Monday Nepali (Nepal) Sunday Dutch (Netherlands) Monday Frisian (Netherlands) Monday Maori (New Zealand) Monday English (New Zealand) Monday Spanish (Nicaragua) Sunday Hausa (Latin, Nigeria) Sunday Yoruba (Nigeria) Sunday Igbo (Nigeria) Sunday Norwegian, Bokmål (Norway) Monday Sami, Northern (Norway) Monday Norwegian, Nynorsk (Norway) Monday Sami, Lule (Norway) Monday Sami, Southern (Norway) Monday Arabic (Oman) Saturday Urdu (Pakistan) Monday Punjabi (Pakistan) Monday Sindhi (Pakistan) Monday Spanish (Panama) Sunday Spanish (Paraguay) Monday Quechua (Peru) Monday Spanish (Peru) Monday Filipino (Philippines) Sunday English (Philippines) Sunday Polish (Poland) Monday Portuguese (Portugal) Sunday French (Monaco) Monday Spanish (Puerto Rico) Sunday Arabic (Qatar) Saturday Romanian (Romania) Monday Russian (Russia) Monday Tatar (Russia) Monday Bashkir (Russia) Monday Sakha (Russia) Monday Kinyarwanda (Rwanda) Sunday Arabic (Saudi Arabia) Saturday Wolof (Senegal) Monday Fulah (Latin, Senegal) Monday Serbian (Latin, Serbia) Monday Serbian (Cyrillic, Serbia) Monday Serbian (Latin, Serbia and Montenegro (Former)) Monday Serbian (Cyrillic, Serbia and Montenegro (Former)) Monday Chinese (Simplified, Singapore) Sunday English (Singapore) Sunday Slovak (Slovakia) Monday Slovenian (Slovenia) Monday Setswana (South Africa) Monday isiXhosa (South Africa) Sunday isiZulu (South Africa) Sunday Afrikaans (South Africa) Sunday Sesotho sa Leboa (South Africa) Monday English (South Africa) Monday Catalan (Catalan) Monday Basque (Basque) Monday Galician (Galician) Monday Valencian (Spain) Monday Spanish (Spain, International Sort) Monday Sinhala (Sri Lanka) Monday Tamil (Sri Lanka) Monday Swedish (Sweden) Monday Sami, Northern (Sweden) Monday Sami, Lule (Sweden) Monday Sami, Southern (Sweden) Monday Romansh (Switzerland) Monday German (Switzerland) Monday Italian (Switzerland) Monday French (Switzerland) Monday Syriac (Syria) Sunday Arabic (Syria) Saturday Chinese (Traditional, Taiwan) Sunday Tajik (Cyrillic, Tajikistan) Monday Thai (Thailand) Monday English (Trinidad and Tobago) Sunday Arabic (Tunisia) Monday Turkish (Turkey) Monday Turkmen (Turkmenistan) Monday Arabic (U.A.E.) Saturday Ukrainian (Ukraine) Monday Welsh (United Kingdom) Monday Scottish Gaelic (United Kingdom) Monday English (United Kingdom) Monday English (United States) Sunday Cherokee (Cherokee) Sunday Hawaiian (United States) Sunday Spanish (United States) Sunday Spanish (Uruguay) Monday Uzbek (Latin, Uzbekistan) Monday Uzbek (Cyrillic, Uzbekistan) Monday Vietnamese (Vietnam) Monday Arabic (Yemen) Saturday English (Zimbabwe) Sunday