128
\$\begingroup\$

Create the shortest possible obfuscated program that displays the text "Hello World".

In order to be considered an obfuscated program, it must meet at least two of the following requirements:

  • Does not contain the characters: h, l, w and d in any case
  • Does not contain the characters: e, o, r, 0, and 1 in any case
  • Does not contain the characters: 2 or 7

Input:
none

Output:
Hello World

Leaderboard

Here is a Stack Snippet to generate both a regular leaderboard and an overview of winners by language.

/* Configuration */

var QUESTION_ID = 307; // Obtain this from the url
// It will be like https://XYZ.stackexchange.com/questions/QUESTION_ID/... on any question page
var ANSWER_FILTER = "!t)IWYnsLAZle2tQ3KqrVveCRJfxcRLe";
var COMMENT_FILTER = "!)Q2B_A2kjfAiU78X(md6BoYk";
var OVERRIDE_USER = 48934; // This should be the user ID of the challenge author.

/* App */

var answers = [], answers_hash, answer_ids, answer_page = 1, more_answers = true, comment_page;

function answersUrl(index) {
  return "https://api.stackexchange.com/2.2/questions/" +  QUESTION_ID + "/answers?page=" + index + "&pagesize=100&order=desc&sort=creation&site=codegolf&filter=" + ANSWER_FILTER;
}

function commentUrl(index, answers) {
  return "https://api.stackexchange.com/2.2/answers/" + answers.join(';') + "/comments?page=" + index + "&pagesize=100&order=desc&sort=creation&site=codegolf&filter=" + COMMENT_FILTER;
}

function getAnswers() {
  jQuery.ajax({
    url: answersUrl(answer_page++),
    method: "get",
    dataType: "jsonp",
    crossDomain: true,
    success: function (data) {
      answers.push.apply(answers, data.items);
      answers_hash = [];
      answer_ids = [];
      data.items.forEach(function(a) {
        a.comments = [];
        var id = +a.share_link.match(/\d+/);
        answer_ids.push(id);
        answers_hash[id] = a;
      });
      if (!data.has_more) more_answers = false;
      comment_page = 1;
      getComments();
    }
  });
}

function getComments() {
  jQuery.ajax({
    url: commentUrl(comment_page++, answer_ids),
    method: "get",
    dataType: "jsonp",
    crossDomain: true,
    success: function (data) {
      data.items.forEach(function(c) {
        if (c.owner.user_id === OVERRIDE_USER)
          answers_hash[c.post_id].comments.push(c);
      });
      if (data.has_more) getComments();
      else if (more_answers) getAnswers();
      else process();
    }
  });  
}

getAnswers();

var SCORE_REG = /<h\d>\s*([^\n,]*[^\s,]),.*?(\d+)(?=[^\n\d<>]*(?:<(?:s>[^\n<>]*<\/s>|[^\n<>]+>)[^\n\d<>]*)*<\/h\d>)/;

var OVERRIDE_REG = /^Override\s*header:\s*/i;

function getAuthorName(a) {
  return a.owner.display_name;
}

function process() {
  var valid = [];
  
  answers.forEach(function(a) {
    var body = a.body;
    a.comments.forEach(function(c) {
      if(OVERRIDE_REG.test(c.body))
        body = '<h1>' + c.body.replace(OVERRIDE_REG, '') + '</h1>';
    });
    
    var match = body.match(SCORE_REG);
    if (match)
      valid.push({
        user: getAuthorName(a),
        size: +match[2],
        language: match[1],
        link: a.share_link,
      });
    
  });
  
  valid.sort(function (a, b) {
    var aB = a.size,
        bB = b.size;
    return aB - bB
  });

  var languages = {};
  var place = 1;
  var lastSize = null;
  var lastPlace = 1;
  valid.forEach(function (a) {
    if (a.size != lastSize)
      lastPlace = place;
    lastSize = a.size;
    ++place;
    
    var answer = jQuery("#answer-template").html();
    answer = answer.replace("{{PLACE}}", lastPlace + ".")
                   .replace("{{NAME}}", a.user)
                   .replace("{{LANGUAGE}}", a.language)
                   .replace("{{SIZE}}", a.size)
                   .replace("{{LINK}}", a.link);
    answer = jQuery(answer);
    jQuery("#answers").append(answer);

    var lang = a.language;
    if (/<a/.test(lang)) lang = jQuery(lang).text();
    
    languages[lang] = languages[lang] || {lang: a.language, user: a.user, size: a.size, link: a.link};
  });

  var langs = [];
  for (var lang in languages)
    if (languages.hasOwnProperty(lang))
      langs.push(languages[lang]);

  langs.sort(function (a, b) {
    if (a.lang > b.lang) return 1;
    if (a.lang < b.lang) return -1;
    return 0;
  });

  for (var i = 0; i < langs.length; ++i)
  {
    var language = jQuery("#language-template").html();
    var lang = langs[i];
    language = language.replace("{{LANGUAGE}}", lang.lang)
                       .replace("{{NAME}}", lang.user)
                       .replace("{{SIZE}}", lang.size)
                       .replace("{{LINK}}", lang.link);
    language = jQuery(language);
    jQuery("#languages").append(language);
  }

}
body { text-align: left !important}

#answer-list {
  padding: 10px;
  width: 290px;
  float: left;
}

#language-list {
  padding: 10px;
  width: 290px;
  float: left;
}

table thead {
  font-weight: bold;
}

table td {
  padding: 5px;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<link rel="stylesheet" type="text/css" href="//cdn.sstatic.net/codegolf/all.css?v=83c949450c8b">
<div id="answer-list">
  <h2>Leaderboard</h2>
  <table class="answer-list">
    <thead>
      <tr><td></td><td>Author</td><td>Language</td><td>Size</td></tr>
    </thead>
    <tbody id="answers">

    </tbody>
  </table>
</div>
<div id="language-list">
  <h2>Winners by Language</h2>
  <table class="language-list">
    <thead>
      <tr><td>Language</td><td>User</td><td>Score</td></tr>
    </thead>
    <tbody id="languages">

    </tbody>
  </table>
</div>
<table style="display: none">
  <tbody id="answer-template">
    <tr><td>{{PLACE}}</td><td>{{NAME}}</td><td>{{LANGUAGE}}</td><td>{{SIZE}}</td><td><a href="{{LINK}}">Link</a></td></tr>
  </tbody>
</table>
<table style="display: none">
  <tbody id="language-template">
    <tr><td>{{LANGUAGE}}</td><td>{{NAME}}</td><td>{{SIZE}}</td><td><a href="{{LINK}}">Link</a></td></tr>
  </tbody>
</table>

\$\endgroup\$
  • 7
    \$\begingroup\$ I guess import in python is not permitted. \$\endgroup\$ – Alexandru Feb 1 '11 at 0:07
  • 26
    \$\begingroup\$ Does these rules apply to language keywords as well? \$\endgroup\$ – hallvabo Feb 1 '11 at 13:04
  • 8
    \$\begingroup\$ are those case insensitive restrictions? \$\endgroup\$ – oenone Aug 4 '11 at 14:22
  • 21
    \$\begingroup\$ Could someone explain why 2 and 7 are not allowed? I'm just curious as I don't see why those were chosen in particular. \$\endgroup\$ – Thomas Eding Aug 5 '11 at 23:01
  • 4
    \$\begingroup\$ @trinithis, and others, ASCII character 72 is "H" which is why I chose those two \$\endgroup\$ – Kevin Brown Sep 18 '11 at 23:18

129 Answers 129

1 2 3 4
5
0
\$\begingroup\$

Vim, 31 keystrokes

ia<C-v><C-v>92<esc>22<C-a>SU<C-o>@"yyb Jb<C-v>x65yq<esc>g?g

This was really fun! I'll write an explanation a little bit later.

| improve this answer | |
\$\endgroup\$
0
\$\begingroup\$

tcl, 104

\u6cmap x {G d k k n \U1F V n q k c} {scan $x %c n;incr n;puts -n\u6Fn\u65w\u6cin\u65 [f\U6Frmat %c $n]}

Almost meets 3 requirements. Unfortunately I am not successful when I try to use directly the char by key pressing Alt+Num 31, representable as:

Dec U-Hex  Oct
\31 \U1F   \037

which happens to have forbidden chars in all number bases!

Available to run on: http://rextester.com/live/GQBHU26987

| improve this answer | |
\$\endgroup\$
0
\$\begingroup\$

Ruby, 51 bytes

Chars not used: hlwd27

puts "Ifmmp!Xpsme".chars.map{|i|(i.ord-1).chr}.join
| improve this answer | |
\$\endgroup\$
0
\$\begingroup\$

Perl, 33 bytes

print 'Ifmmp Xpsme'=~y/G-t/F-s/r

Breaks rule 2.

Alternatively:

perl -E "say 'Ifmmp Xpsme'=~y/G-t/F-s/r"

I think this counts as one byte shorter...

| improve this answer | |
\$\endgroup\$
0
\$\begingroup\$

AWK, 164 bytes

#!/bin/awk -f
BEGIN{n++
system("awk 'printf(\"%c",$n)}'<<<\""69+3"\n"98+3"\n"36*3"\n"36*3"\n"36*3+3"\n"35-3"\n"84+3"\n"36*3+3"\n"36*3+6"\n"36*3"\n"94+6"\n"6+4"\"")}

Usage: Place the code in a file, FILE, and set the 'executable-bit' to true. Sending a single string input will print Hello World. Multi-line input results in the string being printed once for each line.

Example:

File <<< "42"

Since a program was requested, I assume the code is running on some UNIX-like environment with the awk executable available at /bin/awk. I further assume that /bin is in your path.

Not sure if this really counts as just an AWK program, since it is using the system command, but at least the system call is calling AWK. :)

I do violate the second rule, simply because I couldn't come up with a way around using the printf command. :(

| improve this answer | |
\$\endgroup\$
0
\$\begingroup\$

Mathematica 144 Bytes

StringJoin@Insert[ToUpperCase@StringPart[#,1]<>StringPart[#,5-3;;]&/@IntegerString[{349644888483444,656639565449499}/(498331*8*3+3),36]," ",5-3]

This is a pain in Mathematica because so few functions adhere to rules 2 & 3. This answer adheres to rules 1 & 2 and also takes care to do the Capitalization. I couldn't even use the built in Capitalize function. The basic idea is to find the base 10 representation of the string assuming it's in base 36.

as can be seen by running

Select[Names["System`*"],StringFreeQ[#,{"h","l","w","d"},IgnoreCase->True]&&StringFreeQ[#,{"e","o","r","0","1"},IgnoreCase->True]&&UpperCaseQ[StringPart[#,1]]&]

which yields a handful of built in symbols, only some of which are functions, and none of which are helpful with string manipulation.

{Abs,Annuity,Ask,Assuming,Axis,Back,C,Cap,Csc,Cubics,Cup,CupCap,Cyan,Fit,Gamma,I,If,Im,In,Infinity,Infix,Inpaint,Input,K,Magnify,Map,MapAt,Masking,Max,Min,MinMax,Minus,Missing,MissingQ,N,NSum,Pi,Pick,Pink,Put,QGamma,Quantity,QuantityQ,QuantityUnit,Quit,Scan,Sign,Sin,Sinc,Skip,Spacings,Span,Stack,Stub,SubMinus,Sum,Syntax,SyntaxQ,Tab,TabSpacings,Tan,Ticks,Timing,Tiny,Up,Using}

A single function solution that came to mind was:

Transliterate["הֶללֳ וֳרלד"]

which translates from Hebrew characters, but as you can see it it violates rules 2 and 3.

| improve this answer | |
\$\endgroup\$
0
\$\begingroup\$

Jelly, 7 bytes (non-competing)

“½,⁾ẇṭ»

Try it online!

| improve this answer | |
\$\endgroup\$
0
\$\begingroup\$

PHP, 41 bytes

<?for(;$a='Gdkkn vnqkc'[$p++];print++$a);

Complies with rules 1 and 3.

| improve this answer | |
\$\endgroup\$
-1
\$\begingroup\$

Excel 138

(Not actually a language and not really obfuscated, but why not)

=CONCAT(CHAR(69+3),CHAR(98+3),CHAR(99+9),CHAR(99+9),CHAR(45+66),CHAR(35-3),CHAR(33+86),CHAR(43+68),CHAR(48+66),CHAR(44+64),CHAR(45+55))

Violates rule #2 tho, as it contains 'o' and 'r'

| improve this answer | |
\$\endgroup\$
  • 4
    \$\begingroup\$ it also contains H (rule #1). \$\endgroup\$ – Andrey Jan 18 '17 at 9:27
  • \$\begingroup\$ 1. CHAR automatically violates 1 and 2. 2. Older Excel versions use CONCATENATE, but besides that, you can use the & operator. I've posted another answer that doesn't break Rule 1. \$\endgroup\$ – Calculuswhiz Jun 15 at 15:39
1 2 3 4
5

Not the answer you're looking for? Browse other questions tagged or ask your own question.