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.
117
questions
115
votes
73answers
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 ...
125
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 ...
584
votes
280answers
214k 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 ...
110
votes
51answers
15k 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 ...
39
votes
9answers
5k views
“Convenient palindrome” checker
If you've ever tried to write palindromic code before, you'd know how much brackets tend to get in your way. ()() is not a palindrome, even though it kinda looks ...
90
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 ...
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! ...
228
votes
115answers
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 "...
65
votes
20answers
7k 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 ...
25
votes
11answers
3k views
Calculate 500 digits of pi
Write a program to calculate the first 500 digits of pi, meeting the rules below:
It must be less than 500 characters in length.
It cannot include "pi", "math.pi" or similar pi constants, nor may it ...
22
votes
25answers
7k views
Look and say sequence [duplicate]
The look and say sequence is a basic form of run length encoding.
The sequence starts with the number 1 and each additional number encodes the number of digits that are repeated before each digit ...
158
votes
63answers
22k 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 ...
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 ...
70
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 ...
65
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 ...
asked Aug 4 '16 at 22:54
Post Rock Garf Hunter
54.8k12 gold badges178 silver badges395 bronze badges
17
votes
10answers
2k views
The Symbols vs. The Letters
The Symbols vs. The Letters
The ASCII characters have been divided once again! Your sets are The Letters and The Symbols.
The Letters
...
53
votes
146answers
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 ...
42
votes
14answers
7k views
What's the shortest contiguous subset of ASCII you need to output the rest?
The printable ASCII characters (hex codes 20 to 7E) in order are:
...
8
votes
17answers
3k views
Multiply without multiply [closed]
Write the fastest (best big-O) and smallest multiplication algorithm for positive integers, without using multiplication operators. You are only allowed addition, subtraction, logical functions (AND, ...
30
votes
16answers
6k views
Multiply two numbers without using any numbers
You are given as input two strings representing positive integers in base 10, such as "12345" and "42". Your task is to output a ...
22
votes
27answers
2k views
Palindromic palindrome generator
Create a program, that converts input string to a palindrome starting with the input string. The program itself must be a palindrome.
For example input: neverod, ...
20
votes
21answers
2k views
Length of String Using Set Theory
From Wikipedia Set-theoretic definition of natural numbers
The set N of natural numbers is defined as the smallest set containing
0 and closed under the successor function S defined by S(n) = n ∪ ...
104
votes
66answers
26k 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 ...
78
votes
101answers
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/...
75
votes
37answers
12k 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-...
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, ...
80
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 ...
30
votes
69answers
8k views
Check whether an integer is a power of 2 without using +,- operations [closed]
Write a program that checks if the integer is a power of 2.
Sample input:
8
Sample output:
Yes
Sample input:
...
34
votes
56answers
6k views
Capitalize first letter of each word of input
This is a relatively quick one, but I'm sure you'll like it.
Codegolf a program that will take input in the form of a sentence and then provide the output with the first letter capitalized in each ...
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{|}~
...
55
votes
24answers
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, ...
26
votes
11answers
2k views
Official Dyalog APL 2016 Year Game
If you think this could be fun, but too much work, consider participating in this much smaller challenge.
A bit of fun (and possibly frustration!) for 2016... Dyalog's "puzzle of the year". Enjoy!
...
27
votes
18answers
6k views
Shortest Sorted Hello World
Write a program that takes no input and prints Hello, World! to stdout or your language's closest alternative. The catch is that each line in your program must only ...
13
votes
9answers
2k views
Print the first 128 prime numbers without using any reserved words
The obvious solution would be to just print them as a string, but is it possible to write a shorter code?
Requirements:
No input should be processed, and the output should be in the form of ...
4
votes
28answers
1k views
Implement an integer parser
Implement an integer parser in the shortest code possible, with the following restrictions:
The function or program can only take one argument: a string (or equivalent). Assume it to be signed and ...
4
votes
49answers
6k views
Find the absolute value of a number without built-in functions [closed]
The challenge is to take any real number as input and output or return the absolute value. You may not use any built-in functions other than those dealing with input and output/returning. This is code ...
2
votes
8answers
416 views
Exponentiation of natural numbers using only primitive integer operations [duplicate]
The challenge
Implement the C equivalent of the pow() function (exponentiation) for natural numbers, in a language of your choosing, using only addition, ...
-7
votes
28answers
1k views
Produce the word 'codegolf' without using any of its characters in code [closed]
You need to produce the word codegolf
Rules:
None of the characters of the word codegolf (i.e. 'c', 'o', 'd', 'e', 'g', 'o', 'l' and 'f') in either case can ...
85
votes
132answers
44k 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 ...
215
votes
23answers
21k 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 ...
72
votes
117answers
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-...
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 ...
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 ...
66
votes
80answers
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, ...
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 ...
2
votes
7answers
855 views
Kolmogorov Complexity Meta Golfer
Mike Bufardeci (Pyth) - 175 bytes
Leo (Retina) - 175 bytes
devRicher (Lua) - 182 bytes
Peter Taylor (CJam) - Waiting for clarification
Lyth (C++11) - Waiting for clarification
Edit: Several changes ...
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 ...
40
votes
23answers
7k views
Holy Hole In A Donut, Batman!
Some characters are more holy than others. Using as few unholy letters as possible, display the statement above.
Challenge
Write a full program to print ...
48
votes
66answers
5k views
Depalindromize this string!
Given a palindrome generated according to this challenge, depalindromize it.
Test cases
...
36
votes
22answers
6k views
I don't even… I only odd!
Your task is simple: write a program that receives an integer as input and outputs it if it was odd, and does nothing otherwise (not halting is allowed). The challenge is, that you can only use odd ...
