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# Questions tagged [algorithm]

For challenges related to creating or implementing an algorithm.

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### Visually arrange multi-day events on a calendar

The arrangement algorithm I think I've determined the algorithm that Google Calendar uses to visually arrange day-long and longer events at the top of the "Week" view (you may have an ...
• 3,449
3k views

### Elect the Doge of Venice

The Venetian election system was... complicated. The Great Council came together and put in an urn the ballots of all the councilors who were older than 30. The youngest councilor went to St Mark's ...
• 1,363
3k views

### Shortest Code to Find the Smallest Missing Positive Integer

Description Given an unsorted array of integers, find the smallest positive integer that does not appear in the array. Your task is to write the shortest code possible to solve this problem. Input A ...
• 1,772
917 views

### Maximum of outer product of integer vectors (in linear time)

Introduction Our goal is to efficiently find the maximum of a large amount of (redundant) data. We define the outer product of vectors $A$ and $B$ as a matrix containing the products of all ...
• 221
479 views

### 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 ...
• 757
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 figure ...
• 5,600
1 vote
94 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 ...
• 339
434 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 ...
• 341
1 vote
424 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 ...
• 489
641 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 ...
265 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 ...
1 vote
222 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 ...
938 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: ...
• 2,277
18k 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 ...
• 6,897
257 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 ...
• 11.8k
543 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 ...
• 43.8k
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 ...
• 11.9k
4k views

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 ...
• 355
2k 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 ...
• 351
1 vote
306 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):...
• 113
400 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 ...
• 1,440
89 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 ...
• 39
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: ...
• 12.3k
431 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: ...
• 7,511
4k 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 ...
• 7,511
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 ...
• 131
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. ...
• 1,401
613 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 ...
• 1,309
227 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 ...
• 11.2k
705 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 ...
• 30.3k
733 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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