Questions tagged [math]
The challenge involves mathematics in some central way. Also consider using more specific tags, listed in the tag wiki info.
1,815
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Reduce a string up to idempotency
Objective
Given a string consisting of printable ASCII characters (!0x21 ― ~0x7E), treat it as an element in the free idempotent ...
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+50
Compute Dickman
Input
A floating point number \$x\$ between 1 and 8 inclusive.
Output
The Dickman function of \$x\$.
The Dickman–de Bruijn function \$\rho(u)\$ is a continuous function that satisfies the delay ...
- 3,114
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Minimum number of select-all/copy/paste steps for a string containing n copies of the original
This challenge is based on this Mathematics answer.
Write the shortest program or function that, when given some natural number \$n\$, outputs \$S(n)\$, which is the minimum number of steps for ...
- 10.2k
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Find 10 float64s that give the least accurate sum
Input
Integer \$n > 1\$
Output
Ten 64 bit floating point numbers between \$-n\$ and \$n\$, inclusive, whose sum is the least accurate.
Details and examples.
These examples are not claimed to be ...
- 3,114
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Sum of square roots (as an algebraic number)
An algebraic number is a number that is a root of a non-zero polynomial with integer coefficients. It is well-known that the sum of two algebraic numbers is algebraic. In particular, the sum of a list ...
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Find the most isolated point
Given two non-empty sets of points \$P,T = \{(x,y)\ |\ x,y \in \mathbb{Z} \}\$, find the point \$p \in P\$ such that it is the "most isolated" from all points in \$T\$. The "most ...
- 10.2k
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Compute the degree of a string
The input is a string made of the letters a,b,c only. The output is an integer representing the degree of the sequence. The degree of a sequence is computed as follows:
Assume that each of the ...
- 1,993
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How far are you?
Write a program that gets coordinates of two objects on Earth, and calculates how far they are from each other directly in space (a straight line through Earth) and on the surface (through the ...
- 181
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*Trivial* near-repdigit perfect powers
Task
Output the sequence that precisely consists of the following integers in increasing order:
the 2nd and higher powers of 10 (\$10^i\$ where \$i \ge 2\$),
the squares of powers of 10 times 2 or 3 (...
- 77.7k
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Infer pluses and minuses
The problem
Consider an equation such as "3 ± 2 ± 4 ± 1 = 4" and determine if there exists a sequence of pluses and minuses that makes it arithmetically correct. If it exists, ...
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Is it a cartesian product?
The cartesian product of two multisets \$A\$ and \$B\$ is the multiset of all ordered pairs consisting of an element of \$A\$ and an element of \$B\$. For example, the cartesian product of \$\{1, 2, 7,...
- 39.2k
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Dishonest dungeon staff
This is a joint post with https://puzzling.stackexchange.com/questions/126255/dishonest-dungeon-staff
You are faced with the difficult task to set up a dungeon for adventurers. However you made a deal ...
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Output a 1-2-3-5-7... sequence
Follow-up of my previous challenge, inspired by @emanresu A's question, and proven possible by @att (Mathematica solution linked)
For the purposes of this challenge, a 1-2-3-5-7... sequence is an ...
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Output a 1-2-3 sequence
For the purposes of this challenge, a 1-2-3 sequence is an infinite sequence of increasing positive integers such that for any positive integer \$n\$, exactly one of \$n, 2n,\$ and \$3n\$ appears in ...
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Draw a Fibonacci Swoosh
Title courtesy of Greg Martin
For this challenge, I'll define an arc of size \$k\$ as a single piece of a sine wave with a length of \$k\$ units and an height of \$\frac{k}{4}\$ units:
And I'll ...
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