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Questions tagged [algorithm]

For challenges related to creating or implementing an algorithm.

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NxM List Combination Closest to Target

Given a list of N lists, each containing M positive integers, and a separate list of M positive integers (target values), return a list of N scalars (integers with a value of 0 or more) that ...
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  • 757
21 votes
25 answers
2k views

Climbing the Bookshelf

Introduction You're making a robot that can navigate a set of books of varying heights. It can climb books and jump off books, but if the distance is too big it will stop to prevent damage. To firgure ...
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  • 3,224
1 vote
0 answers
83 views

Make me equal to 24 [duplicate]

Based on this game. Description : Based on Wikipedia's description. The 24 Game is an arithmetical card game in which the objective is to find a way to manipulate four integers so that the end result ...
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  • 329
13 votes
9 answers
405 views

Taking the long route

Challenge Your goal is to find the furthest point on a graph (from a provided start node). Your code doesn't need to handle cycles in the graph properly, but it might pose a fun challenge. For this ...
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  • 311
1 vote
1 answer
399 views

Hacker Challenge: Guess the Correct Password

In an attempt to “liberate” their fellow birds, a group of highly intelligent hens are attempting to compromise the zoo’s security system. To get access to the zoo’s mainframe, the hens first need to ...
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  • 447
10 votes
1 answer
527 views

How quickly can you convert an NFA to a DFA?

Convert NFA to DFA as quickly as possible. Input Your input will be an NFA. In order to be able to test your code, it needs to be able to handle an NFA in the following format. This is taken ...
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9 votes
1 answer
254 views

Branch Out - Monkey Edition

The Monkey has swung home to find his tree all in pieces. He likes order and scoops up all his 'tree-parts' and sets them out in 3 groups. The Monkey's ...
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1 vote
0 answers
191 views

What does the shortest pseudo-random algorithm look like? [closed]

After seeing some impossibly short solutions in this SE, I began to wonder what code someone could come up with to build a pseudo-random number generator. Now given that I am new to programming, I ...
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19 votes
1 answer
914 views

Gerrymander North Carolina

The challenge How well can you gerrymander North Carolina into 13 voting districts? In this challenge, you use the following files to draw different maps for Republicans and Democrats. File 1: ...
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34 votes
12 answers
13k views

The fastest Sudoku solver

Winner found It seems as if we have a winner! Unless anyone plans on contesting the world's current fastest Sudoku solver, user 53x15 wins with the staggeringly fast solver Tdoku. For anyone still ...
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  • 6,657
8 votes
6 answers
253 views

Help me sub-divide a time signature

This challenge is based on a video in which Andrew Huang discusses unusual time signatures... https://www.youtube.com/watch?v=JQk-1IXRfew In it, he advises that you can understand time signatures by ...
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  • 11.1k
17 votes
3 answers
509 views

Bridge the Gaps

Given a black and white image with a white background and a set of black dots, paint a set of white pixels red, such that there is a path between each pair of black pixels. Details A path is a set ...
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  • 43k
37 votes
11 answers
1k views

There's an echo in my array... echo in my array... my array

Help! I seem to have an annoying echo in some of my arrays, and I'd like to get rid of it. When this occurs, the original array repeats itself somewhere in the middle causing the values to be added ...
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  • 11.1k
23 votes
23 answers
3k views

Upside-Down Pyramid Addition...REVERSED! [closed]

Upside-Down Pyramid Addition is the process of taking a list of numbers and consecutively adding them together until you reach one number. When given the numbers ...
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  • 355
10 votes
6 answers
1k views

Consistent Overhead Byte Stuffing (COBS)

I'm surprised this hasn't been posted before! The Consistent Overhead Byte Stuffing (COBS) algorithm is used to delimit byte streams. We choose a frame marker (we'll use 0x00) and wherever 0x00 ...
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  • 341
1 vote
2 answers
297 views

Describe a 2D Bitmap Using Filled Rectangle Mapping

Idea: Consider a 2-bit bitmap of arbitrary side-lengths overlaid on a coordinate grid and imaged with random data (1's represent an element of the image, 0's represent the "blank" canvas background):...
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  • 113
13 votes
5 answers
315 views

Matrix trace for any matrix through... Bresenham’s line rasterisation

Inspired by this. Agatha Stephendale, a sophomore who is really into raster graphics, has taken a course in linear algebra. Now she imagines matrices as rectangles, but in her artistic mind, she ...
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3 votes
0 answers
87 views

lexicographically sorted list of index [closed]

Given a drawing of the letter shoot system, where an existing piece of pipe is marked with a *, and an empty spot is marked with a ., your task is to compile a lexicographically sorted list of index ...
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  • 39
23 votes
6 answers
2k views

128 years? Hypothetical leap year reform

The solar year is 365 days, 5 hours, 48 minutes, 45 seconds, and 138 milliseconds, according to this video. With the current Gregorian calendar, the rules for leap years are as follows: ...
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  • 12.1k
3 votes
2 answers
409 views

Golfing Newton's Method

I have the following code which I've written to emulate Newton's method for deriving the square root of a number: ...
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20 votes
12 answers
3k views

Ethiopian Multiplication

This question is inspired by this answer. Coincidentally, I used to use Ethiopian Multiplication when I was a kid, but had never known the name of the method until recently. Ethiopian multiplication ...
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3 votes
1 answer
1k views

remove duplicates from array [closed]

You have given an array from which we need to remove duplicates. Rules: First or immediate duplicates gets removed first. Array contains natural numbers ...
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36 votes
21 answers
3k views

The Original Number

Guidelines Scenario John has an important number, and he doesn't want others to see it. He decided to encrypt the number, using the following steps: His number is always a non-decreasing sequence (ie. ...
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  • 1,297
3 votes
6 answers
561 views

Golf Me A Bubble Sort [duplicate]

Your task is to create a program that performs a bubble sort on a given array until it is sorted. Algorithm In order to qualify as a bubble sort, the program must operate as follows: Each pass goes ...
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  • 1,289
7 votes
2 answers
211 views

Create a version series

The Definition Given an integer x, a version series is a set of digits (base 10) from which any x-length subset of consecutive ...
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8 votes
4 answers
667 views

Find the rows which make each column have one True (was: Knuth's Algorithm X)

Task Given a Boolean matrix, find one (or optionally more) subset(s) of rows which have exactly one True in each column. You may use any algorithm, but must support very large matrices, like the last ...
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  • 27.2k
11 votes
8 answers
712 views

Number Triangles

Credit My thanks to Rand Al'Thor's letter-based question for the inspiration for this code-golf challenge. Background The nature of this challenge is based off the algorithm mentioned by Rand in ...
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