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.
283
questions
64
votes
61answers
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 ...
39
votes
13answers
5k views
Programming with a Sporadic Shift Key
There's something wrong with your keyboard. The Shift key has a mind of its own. Every time you type a character you have no idea whether it will come out shifted or not (though it is 50-50). Besides ...
23
votes
8answers
2k views
Prolific Perfect Pangram Programs Pertaining to Printable ASCII
Updates: Time limit removed. You must be able to describe output - see new rule.
A pangram is a sentence that uses every letter in the alphabet at least once, such as:
The quick brown fox jumps ...
8
votes
2answers
911 views
¿Yo Quiero jQuery?
The Setup
You are given a simple web page with 11 elements:
10 input elements with IDs i1 thru ...
20
votes
11answers
1k views
Restricted Polyglot
Polyglots are programs that are valid in multiple programming languages simultaneously. Most such polyglots are written in such a way that certain constructs of one language are interpreted as ...
7
votes
4answers
4k views
Un-hash the Java Hash
Hash Un-hashing
The basic goal of this challenge is to exploit the high probability of collision in the Java Hash function to create a list of plausible inputs that created an outputted hash. The ...
22
votes
14answers
3k views
Un-round fractions
When you convert a fraction to a decimal number and you want to store that number, you often have to round it, because you only want to use a certain amount of memory. Let's say you can only store 5 ...
12
votes
15answers
10k views
Compare two integers in C or C++ without comparison operators
Produce the shortest program which takes two signed integers as input (through stdin or as arguments) and displays 3 different outputs depending upon whether the first number is (1) greater than, (2) ...
44
votes
4answers
2k views
Multiply with restricted operations
There's a 500 rep unofficial bounty for beating the current best answer.
Goal
Your goal is to multiply two numbers using only a very limited set of arithmetic operations and variable assignment.
...
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
...
-5
votes
4answers
1k views
Convert to uppercase and lowercase without branching and comparisons
Write two functions/programs which take an ASCII code of character (8-bit unsigned integer) and one of them converts char to uppercase and other to lowercase.
That is, they must be equivalent to ...
6
votes
6answers
4k views
Solve quadratic equation using only 3 variables and arithmetic
Write function which solves equation of degree less than or equal to 2 (ax^2 + bx + c = 0).
Input
Function should get 3 parameters - floating point numbers which ...
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:
...
12
votes
5answers
835 views
Raise to the Power
Challenge
Challenge is writing a program that takes a positive numbers a and a nonzero number b and outputs ...
13
votes
10answers
1k views
Quoting Big Brother
Task: Have your program randomly choose one of the following two quotes at runtime and print that one quote, exactly as shown.
1:
...
44
votes
63answers
8k views
47
votes
14answers
7k 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 ...
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{|}~
...
7
votes
12answers
778 views
Convert numbers to symbols without string or char literals
Read infinitely from stdin, and convert every number to the corresponding symbol on a US qwerty keyboard.
No string or character literals anywhere are permitted.
E.g. if the input is ...
9
votes
3answers
750 views
Calculate to how many cubes one cube can be cut
Imagine some cube which we can cut into smaller cubes without remaining pieces.
Find to how many cubes a cube can be cut.
For example, a cube can be cut into 8, 27 (obviously 3rd powers of integers) ...
22
votes
14answers
2k views
Khinchin's constant to as many decimal places as possible in 64 bytes or less
Khinchin's constant is a curious mathematical constant that, according to Wolfram MathWold, is "notoriously difficult to calculate to high precision".
Here it is to 100 digits:
2....
46
votes
50answers
7k views
Rock Around the Clock
In as few Unicode characters as possible, print the following (144 characters):
...
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 ...
1
vote
2answers
2k views
Babylon.js - loop through a scene and apply a simple fragment shader to all of the objects
You have a library - a fully loaded 2014 Babylon.js.
You have a fragment shader - let's call it sample.fragment.fx.
You have a scene - loaded ahead of time, possibly from a .babylon JSON file.
Your ...
3
votes
1answer
2k views
A Most Excellent Code Golf Adventure
You dudes, the Most Excellent Adventure is a home brew roleplaying game system based on the Bill & Ted Films, plays gnarly air guitar riff.
In this game system, when you draw from your dice pool ...
20
votes
16answers
5k views
Determine if an integer is divisible by 3
Your goal is to determine if a number is divisible by 3 without using conditionals.
The input will be an unsigned 8 bit number from 0 to 255. Creativity encouraged!
You are ONLY allowed to use
...
-3
votes
9answers
414 views
Restricted minumum
You need to find the sum of minimum values of two list (same size) of small numbers. In a C like language, that could be expressed as:
...
3
votes
5answers
498 views
Increment Bitwise
Make a function that increments a number using only bitwise, loops, and conditions.
Rules:
All entries must be as per the language spec defined below.
Scoring is not of code length, but of the ...
4
votes
7answers
2k views
Not-endless Recursion without a base case [closed]
Write a recursive function/program, to calculate either the Factorial or the Fibonacci number of a given non-negative integer, without explicitly implementing the base case(s).
Your program/function ...
2
votes
2answers
1k views
Find nth root of variable without using math operators/functions
Write a program which, given two positive integers n and x, will display the n-th root of x (which is also x1/n) in decimal to an accuracy of 0.00001. The program must output the resulting number in ...
6
votes
3answers
1k views
Negate a number
You are to accept, on standard input, one number. You will then output the negation of that number. Your code will do nothing else. You may accept various formats if you wish (like "one" or ("uno+2....
20
votes
1answer
1k views
Efficient error-free* encoding [closed]
The mission
As is well known, the genetic material of all known creatures on Earth is encoded in DNA; using the four nucleotides adenine, thymine, cytosine, and guanine. (Commonly represented by ATGC)...
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 ...
3
votes
21answers
5k views
Print 123454321 without if statements and using only 2 variables [closed]
The challenge: Write a function, that delivers following output: "1 2 3 4 5 4 3 2 1".
Kids stuff? Of course. But here's the point:
You only can use: 1 for loop, 2 int variables.
You must not use: IF ...
13
votes
8answers
5k views
Calculate the square root only using ++
Your task is to calculate the square root of a positive integer without using any mathematical operators to change the number, such as:
Setting a variable (ex. squareRoot = 5)
Addition (A+B)
...
3
votes
6answers
2k views
print “Hello, world!” without using literals [closed]
Write a program that prints "Hello, world!" without using any kinds of literals.
Don't use string literals, numeric literals, byte literals, char literals, etc. Default values are allowed in ...
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 ...
6
votes
5answers
308 views
Write biSp in point-free form using as few terms as possible
The Haskell function biSp has type signature
...
26
votes
12answers
5k views
Print the Golden Ratio
This was fun! However with only three digits, the fun was over way too soon. This challenge is similar, but we'll keep the fun going.
The Challenge
Print as many digits of the Golden Ratio φ as ...
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 ...
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 ...
13
votes
1answer
2k views
Duct tape can fix anything [closed]
Overview
This challenge was inspired by this StackOverflow Meta post. In it, @hakre says:
I've seen a project really written by Stackoverflow (a noob copies together from SO here and SO there), ...
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:
...
-4
votes
4answers
915 views
Print “Hello World” in Ascii Art … without its characters [closed]
Your mission is to write a program that prints "Hello World!". Simple?
The text must be human readable and should not be "|-| € |_ |_ 0 // 0 |? |_ |) \./" or something like that.
The program ...
-2
votes
9answers
560 views
I challenge you to generate the following sequence [closed]
I challenge you to generate the following sequence till 100 terms through any programming language in shortest characters possible.
The sequence is like this :-
...
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 ∪ ...
12
votes
7answers
4k views
Determine if a number is prime without using arithmetic [duplicate]
Write a program which determines if a given number is prime.
The catch: No digits or arithmetical operators. This means:
No digits from 0 to ...
2
votes
6answers
411 views
Format a US address
Your task is to format an address given in all lowercase to a friendlier format. Here's the catch, no regexes.
Addresses will be given in the following format:
...
5
votes
1answer
826 views
Let us create a sonnet quine! [closed]
There are programs that will output its source code to standard output and do nothing else. They also access no external output. This type of program is known as a quine, and is a common code ...
15
votes
18answers
925 views
Alphanumeric balance
Write a program which gets a string as its input, and counts the number of alphanumeric and non-alphanumeric characters in it. It has to display its result like this:
input: ...
