Questions tagged [restricted-source]

Imposes a restriction on the source code used to solve the challenge, for example, having no numbers in the source code.

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572
votes
262answers
208k views

Produce the number 2014 without any numbers in your source code

Note to challenge writers as per meta consensus: This question was well-received when it was posted, but challenges like this, asking answerers to Do X without using Y are likely to be poorly ...
226
votes
111answers
32k views

Without using numbers, get the highest salary you can. But don't exaggerate!

As I'm applying for some jobs whose job advert doesn't state the salary, I imagined a particularly evil interviewer that would give the candidate the possibility to decide their own salary ...by "...
212
votes
19answers
20k views

DISARM THE B.O.M.B.!

You have been hired for your tech knowledge as a Secret Agent's sidekick to ensure that the good guy can get his job done and the world can be saved. This is your last mission before retiring with a ...
153
votes
60answers
21k views

How high can you count?

Challenge: Your task is to write as many programs / functions / snippets as you can, where each one outputs / prints / returns an integer. The first program must output the integer ...
123
votes
123answers
37k views

Obfuscated Hello World

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 ...
119
votes
95answers
21k views

ASCII's 95 Characters…95 Movie Quotes

Update: The winner has been decided, but the challenge is not over! Finally, nearly 3 months after the question first started, someone has remained the last answerer for more than a week! ...
113
votes
72answers
24k views

Largest Number Printable

Your goal is to write a program that prints a number. The bigger the number, the more points you'll get. But be careful! Code length is both limited and heavily weighted in the scoring function. Your ...
106
votes
49answers
14k views

Fewest (distinct) characters for Turing Completeness

Summary: For any given language, what is the smallest amount of unique characters for your language to be Turing-Complete? Challenge: For any language of your choice, find the smallest subset of ...
103
votes
67answers
25k views

I'm a palindrome. Are you?

There have been a couple of previous attempts to ask this question, but neither conforms to modern standards on this site. Per discussion on Meta, I'm reposting it in a way that allows for fair ...
87
votes
23answers
11k views

Programming a Pristine World

Let's define a pristine program as a program that does not have any errors itself but will error if you modify it by removing any contiguous substring of N characters, where ...
85
votes
132answers
42k views

Loop without 'looping' [closed]

A question similar to this has been asked a couple of years ago, but this one is even trickier. The challenge is simple. Write a program (in your language of choice) that repeatedly executes code ...
85
votes
33answers
16k views

Eww, those bytes are gross

Write a program or function that, when given a string, filters out as many distinct bytes as it can and returns the cleaned string. However, since your program hates them, none of these bytes can be ...
80
votes
21answers
6k views

Pristine and Unique Code Bowling

Your challenge is simple: write as long of a pristine program as possible in the language of your choice using only unique bytes. (The full definition of a pristine program, copied from that link, is ...
79
votes
72answers
15k views

Hello world! with limited character repetition

In a language of your choice, write a program that exactly outputs the characters Hello world! followed by a newline. The code: should not use any character more ...
79
votes
47answers
7k views

Find an Illegal String

The challenge is to find a string of characters that cannot appear in any legal program in your programming language of choice. That includes comments, strings, or other "non-executable" parts. ...
77
votes
97answers
13k views

Hello World 0.0!

source: Dilbert, September 8, 1992 I'm hoping to add a new twist on the classic "Hello World!" program. Code a program that outputs Hello World! without: String/...
73
votes
24answers
4k views

Tweetable hash function challenge

In this code-challenge you will write a hash function in 140 bytes1 or less of source code. The hash function must take an ASCII string as input, and return a 24-bit unsigned integer ([0, 224-1]) as ...
72
votes
35answers
11k views

Non-discriminating Programming

We say a string is non-discriminating if each of the string's characters appears the same number of times and at least twice. Examples "aa!1 1 !a !1" is non-...
71
votes
27answers
6k views

2016 Time Capsule String: How Versatile Is Your Language?

About a year ago on Dec 31, 2015, I had the idea that: We should make a time capsule string. Everybody gets to add one character and next new years we'll see who can make the best program out of ...
70
votes
111answers
15k views

Print the alphabet without using each vowel

Inspiration: in 1939, a man named Ernest Vincent Wright wrote a novel called Gadsby without using the letter 'e'. Your task is to write a set of (up to 5) programs in any language (which has a text-...
69
votes
76answers
6k views

No strings (or numbers) attached

If you like this, consider participating in: The Official Dyalog APL 2016 Year Game The monthly Dyalog APL 2017 Code Golf Challenge Make 12 snippets/expressions, in the same language, that result in ...
67
votes
164answers
17k views

The Letter A without A

Your task is to display the letter "A" alone, without anything else, except any form of trailing newlines if you cannot avoid them, doing so in a program and/or snippet. Code that returns (instead of ...
65
votes
79answers
7k views

Three-Three-Three!

Write a program that produces an output such that: At least three distinct characters appear. The number of occurrences of each character is a multiple of 3. For example, ...
64
votes
11answers
3k views

Only Even Bytes

The scenario Lately you have been noticing some strange behavior with your favorite text editor. At first it seemed that it was ignoring random characters in your code when writing to disk. After a ...
63
votes
62answers
9k views

Write lines in detention

Introduction Bad news guys - you got detention. Your English teacher doesn't understand this site and wants you to "stop doing math on your digital dohickeys, this is English class!" She sentenced ...
63
votes
20answers
8k views

Hash collision: “NO” means “YES”

This Code Golf was inspired by the recent Daily WTF article You Can't Handle the True!, which features a string comparison written as: ...
62
votes
17answers
6k views

Just repeat yourself

Write a program that outputs Do not repeat yourself! Your program code must respect the following constraints : its length must be an even number each ...
57
votes
39answers
16k views

All Your Base Are Belong To Us (Restricted)

Input must not be required, and output must read "All your base are belong to us". Restrictions No external resources. Plus a minimum of two of the following: ...
55
votes
20answers
8k views

Exit Code Golfing

Inspired by this default for IO. The Task Write a program that, given an input integer x between 0 and 255, crashes with exit code ...
55
votes
15answers
4k views

Write the whole of the holed using the unholed

The ASCII characters from decimal code 33 to 126 are: !"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~ ...
54
votes
30answers
8k views

Output the text “Code Bowling”

Code-Bowling You've been hired by Brunswick Bowling to create a simple program to output the text Code Bowling on their monitors. This company is worth a pretty ...
54
votes
7answers
7k views

Duct tape can fix Mother's Day

Based on the Duct tape can fix anything question, that was too broad, with very similar rules. Only this time the objective is very specific: The challenge Your mission is to make a program that ...
53
votes
143answers
7k views

Output your Score!

Challenge: The concept is simple enough: write a full program to output its own code golf score! Output should only be the byte count of your program and a trailing ...
53
votes
23answers
6k views

Significant Whitespace

We define whitespace to be any of the three characters, tab (0x09), newline (0x0A) or space (0x20). For this challenge, you're to write two programs or functions in the same programming language, ...
51
votes
43answers
7k views

Print all ASCII alphanumeric characters without using them

Challenge Print the following characters: abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890 The catch is that you may not use any one of them in ...
50
votes
41answers
15k views

Obfuscated FizzBuzz Golf [closed]

Create the shortest possible obfuscated FizzBuzz implementation. To be considered obfuscated, it should satisfy at least one of the following: Does not contain any of the words "Fizz", "Buzz", or "...
50
votes
43answers
9k views

Print every printable ASCII character without using it

In a programming language of your choice, write 95 programs, each of which outputs a different one of the 95 printable ASCII characters without that character occurring anywhere in the program. For ...
49
votes
29answers
10k views

Print the phrase “And she said, 'But that's his.'” using only the alphabet

Print the phrase And she said, 'But that's his.' using only the following characters: ...
48
votes
65answers
10k views

Divide a number by 3 without using *, /, +, -, % operators

Quoting this question on SO (Spoiler alert!): This question has been asked in an Oracle interview. How would you divide a number by 3 without using *, /, +, -, %, operators? The number ...
48
votes
61answers
13k views

yes is 91 lines long

yes, from coreutils, is 91 lines long. Many of them are comments, but that is still WAY too long. Write a program that imitates ...
47
votes
14answers
6k views

Make a code square with your favorite word

Pick your favorite 6 letter common English word that has no repeated letters, such as wombat. Write a program in an N×N grid of characters without comments such ...
47
votes
63answers
5k views

Depalindromize this string!

Given a palindrome generated according to this challenge, depalindromize it. Test cases ...
47
votes
31answers
4k views

Does it Lead or Follow?

In this challenge you are to write a program or function, that takes a string as input and outputs one of two possible values. We will call one of these values truthy and one falsy. They do not need ...
47
votes
2answers
2k views

JSF**k with only 5 symbols?

This is not a challenge but a question, I figured it was on topic because of Non-challenge questions that are related to solving programming puzzles or a particular type of challenge are also on ...
46
votes
50answers
7k views

Rock Around the Clock

In as few Unicode characters as possible, print the following (144 characters): ...
45
votes
23answers
4k views

A Chiral Puzzle

A shape is chiral if no amount of rotation can make it look like it's mirror image. In this puzzle we will be writing chiral computer programs. For this puzzle we will think of a program as a ...
45
votes
1answer
1k views

Cyclic Levenquine

Background As most PPCG regulars will know, a quine is a program which outputs its own source code when run; and the Levenshtein distance between two strings is the minimum number of insertions, ...
44
votes
122answers
13k views

Output programming language name

Challenge: In the programming language of your choice, take no input and output your programming language's name. Fair enough, right? Restrictions: You can't use any character that is included in ...
44
votes
67answers
13k views

Hack into a Lottery

You've recently made an account on a dodgy gambling site, where for a fee of 25 dollars, they will pay you back a random amount between 0 and 50 dollars. After getting around 5 dollars twice, you ...
44
votes
31answers
8k views

Check if a UUID is valid without using regexes

Given a string input, write a program that prints a truthy value to STDOUT or equivalent if the input is a valid UUID, without using regexes. A valid UUID is 32 hexadecimal digits, displayed in ...