Questions tagged [array]
A competition to solve a particular problem through the usage and manipulation of arrays.
840 questions
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Bingo square equivalents
For the purposes of this challenge, a bingo square is a permutation of the numbers 1-25 which we will present in a 5x5 grid. For example, here is the identity permutation as a bingo square:
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Is there an even distance pair?
In this challenge you will receive a list of integers as input. Your program should then determine if there are two equal values in the list at an even distance from each other.
This is code-golf so ...
- 104k
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Order a list by the difference of its elements
Task
Given an unsorted list of integers, order it in such a way that the absolute difference of every two adjacent elements will always be equal to 1:
\$|dx| = 1\$
There will be guaranteed one or more ...
- 3,570
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Counting the sequences
I was thinking when SQL can be less verbose than traditional programming languages and came up with this challenge.
Input
Natural number N
Generating data
We ...
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Find a linear function such that if f(0), f(1), f(2), ⋯ are indices of the elements of the list, the sum must equal to its slope
Challenge:
Find integers \$a\$ and \$b\$ defining linear function \$f(x) = ax + b\$ with \$a > 0, b \ge 0\$ such that the sum of the elements of the input list \$l\$ located at the values of the ...
- 5,115
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Find the first relabeling
I had this problem come up for me recently and I thought it would make a fun code-golf.
You will receive as input a list of positive integers. e.g.
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- 104k
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Activate the Laser Gates
In a secret lab corridor, there are emitters and gates: A number represents a laser emitter with a certain frequency, a 0 represents an inactive gate. If two ...
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Pennies to Dollars
Over on Puzzling a couple years ago, Hermant Agarwal proposed the following question:
In a certain country the following coins are in circulation: 1 cent, 2 cents, 5 cents, 10 cents, 20 cents, 50 ...
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Hide from the "left-hand wall" robot
You need to hide in a maze from a robot which methodically follows the left hand wall rule. That is, it enters, immediately turns left, and will always move keeping its left hand on the wall. It only ...
- 8,130
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Slender sub-lists
A somewhat interesting task came up for me recently which I thought would make a fun code-golf.
Given a number \$n\$ and a list of positive integers less than or equal to \$n\$, we call a sublist ...
- 104k
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Calculate the Squadrat "yard"
Write a program/function to calculate the squadrat "yard" from a collection of squadrats.
Squadrats is a platform that gamifies outdoor activities by recording which large (~1.6 km square) ...
- 8,130
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The Array Walker (part 2)
The Array Walker (part 2)
Input: A non-empty array of integers (without nesting1). This can have negative values!
Output: A boolean value2 indicating whether we can reach the end of the array when ...
- 424
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votes
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Triangular Transposition Cipher
A text that can be arranged triangularly in some fashion can be read back in some other fashion effectively enciphering it.
Narrowing down a set of plausible triangular numberings allows to ...
- 2,463
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votes
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Can we escape from array?
Can we escape from the array?
Input: A non-empty array of non-negative integers (without nesting1).
Output: A boolean value2 indicating whether we can reach the end of the array when starting from the ...
- 424
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Traverse the list
Update 2025-06-04: Thanks for the submissions everyone! It seems like a lot of the solutions are quite slow / timeout for the 100 length test case, so I don't think any will be able to do the 10k. ...
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