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Questions tagged [code-challenge]

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A code challenge is a competition for creative ways to solve a programming puzzle with an objective winning criterion not covered by other scoring tags (e.g. code-golf).

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Given a wall maze of 50x50, exactly same generating algorithm, at different RNG, so every two positions are connected by exactly one path, etc. Write two functions: One takes the maze as input and ...
l4m2's user avatar
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18 votes
3 answers
993 views

Here is a game: Start with the set {1,2,3,...,n} of natural numbers. At any turn of the game, you may pick two numbers from this set, a and b, then replace them with their product a*b. Since it is a ...
Fabius Wiesner's user avatar
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6 votes
2 answers
332 views

from Latexmk: If you use cross-references, you often have to run LaTeX more than once ... Sometimes cross-referenced locations change and you need to run LaTeX again to create the correct reference. ...
InQβ's user avatar
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4 votes
8 answers
934 views

I am interested in the following problem: What is the minimum number of distinct characters used in any programming language that can implement Boolean Algebra? In particular, what is the set that ...
dnn25519's user avatar
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3 votes
1 answer
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CHALLENGE This problem has a math background. For n=1,2,3,4 we want to count the number of families of sets with maximum n elements that satisfy many criteria of the form: $$\bigoplus_{k\in A,A\in \...
Fabius Wiesner's user avatar
  • 357
22 votes
2 answers
2k views

The task is to find parameters that make a fast leap year check correct for the widest range of years. We assume the Proleptic Gregorian calendar, which extends the Gregorian calendar backward from ...
Falk Hüffner's user avatar
  • 491
3 votes
2 answers
553 views

Output \$20\$ float64s with absolute value between 1 and 2 inclusive whose sum has the largest possible relative error. We can assume the true sum is not zero. The sum is to be computed from left to ...
Simd's user avatar
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-3 votes
5 answers
400 views

Introduction This is a small challenge I came up with while trying to make some compact code for my younger brother to use. I don't think it's particularly interesting, but I believe it presents some ...
Mel's user avatar
  • 109
7 votes
2 answers
367 views

Background The newest version of the C standard, C23, adds preprocessor macros like INT_WIDTH, ULONG_WIDTH, and ...
Tavian Barnes's user avatar
  • 191
1 vote
2 answers
351 views

The well known cat command simply copies its stdin directly to stdout unchanged. But there are plenty of other commandline tools that exist... What other commands ...
CarmenCarmen's user avatar
  • 143
5 votes
13 answers
2k views

This is an answer-chaining post, so in this challenge every answer (except the first answer) depends on the previous answer. The goal of this challenge is to output the restricted characters. Define \$...
Fmbalbuena's user avatar
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4 votes
5 answers
1k views

Here is a challenge: What is the shortest possible compiled program? Writing one line programs are fun, but they often lean on language libraries that get pulled into the final bits. How lean can you ...
Roger Hill's user avatar
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30 votes
44 answers
5k views

Write a program fragment so that, when repeated N times it prints the Nth Fibonacci number. For example, if your program is print(x) then: ...
mousetail's user avatar
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21 votes
10 answers
3k views

Find the maximum possible number of disjoint sets of characters, that are Turing complete subsets of your language. Rules: You can assume your Turing complete subset is contained in/called from a ...
bsoelch's user avatar
  • 6,095
12 votes
9 answers
945 views

This is the cops' thread. See the robbers' thread here. In this cops and robbers challenge, the cops will be tasked with writing an algorithm that computes some function of their choice, while the ...
dingledooper's user avatar
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2 votes
0 answers
272 views

Problem You are given a binary string A of length N. You can perform the following type of operation on the string A: Choose two different indices \$i\$ and \$j\$ (\$1 \le i\$, \$j \le N\$) Change \$...
hemanth's user avatar
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19 votes
17 answers
2k views

Each element on the periodic table of the elements has an atomic weight. For example, boron (element 5) has an atomic weight of 10.81. Your challenge is to write a program which takes as input the ...
Ginger's user avatar
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26 votes
58 answers
4k views

Your task Given a string, output the range of ASCII values. Example Let's say we have the string Hello. We get the ASCII values: ...
The Thonnu's user avatar
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3 votes
4 answers
924 views

The wizard is determined to pose the most challenging challenge yet for which he believes the previous solution techniques will not work. He decides to go multidimensional. If there is a number line ...
user avatar
10 votes
1 answer
572 views

Turing Machine Preliminaries A Turing machine is specified by the following data A finite set of symbols S = \$\{s_1,s_2,...\}\$ A finite set of states M = \$\{m_1,m_2,...\}\$ A partially defined ...
QCD_IS_GOOD's user avatar
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6 votes
4 answers
686 views

The wizard has a cunning cousin who is a witch. She looks down on the wizard, regarding him and his puzzles as mathematically naive. On reading his latest puzzle, she scorned him for always asking ...
user avatar
21 votes
12 answers
3k views

If the agent is at the origin it always moves right when you choose it. The goal is to get one agent to 10. The cost is the sum of the square of the total number of moves (left or right) taken by each ...
user avatar
5 votes
7 answers
918 views

Background I was working on a system where for convenience (not security) people could use four digit codes to identify themselves. I figured this is something that may actually be useful in many real ...
Dennis Jaheruddin's user avatar
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20 votes
11 answers
2k views

A pristine program is a program that does not have any errors itself but will error if you modify it by removing any contiguous substring other than the entire program. A crystalline program is sort ...
Wheat Wizard's user avatar
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-14 votes
5 answers
479 views

This is my 12th question, so I thought of this idea. Goal: Output 12, with any preceding or trailing whitespace permitted In as many languages as possible (where different versions or flags count as ...
Sunny's user avatar
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