Daily Programming Challenges from Reddit
Daily Programming Challenges from Reddit
About the Book
So many books exist already that teach you a programming language or subjects such as algorithms, but few books on programming challenges. Puzzles that teach you insights into computer science and applying the right algorithm at the right time, or challenges that help you compare programming paradigms. The Reddit DailyProgrammer community has been an active forum for many years, and the author of this book is one of the moderators of that forum. Using challenges he's written, you can find something to help you grow in your skills.
Originally conceived of as a way to compare programing languages and paradigms, this collection of nearly 200 programming challenges grouped into easy, medium, and hard categories covers a wide variety of topics:
- graph theory
- math and number theory
- algorithms on strings
- encryption
- the HTTP protocol
- bioinformatics
- computational geometry
- puzzles
- and more
This book isn’t meant to be read end to end, but instead picked from here and there. While challenges get harder through the book - progressing from easy to intermediate to hard - they don’t follow a strict set of requirements for categorizing. Don’t be discouraged, sometimes you can come back to a harder one after some thought and practice.
About the Author
Table of Contents
- 1 Introduction
- Introduction
- 1.1.1 How to Use This Book
- 1.1.2 A Note on Solutions
- 2 Easy
- Introduction
- 2.2 3SUM
- 2.3 Abundant and Deficient Numbers
- 2.4 Detecting Alliteration
- 2.5 Anagram Detector
- 2.6 Approximate PI
- 2.7 Atbash Cipher
- 2.8 Balancing Words
- 2.9 Baum-Sweet Sequence
- 2.10 Gold and Treasure: The Beale Cipher
- 2.11 Broken Keyboard
- 2.12 Cellular Automata: Rule 90
- 2.13 Concatenated Integers
- 2.14 Condensing Sentences
- 2.15 Garland Words
- 2.16 Basic Graph Statistics: Node Degrees
- 2.17 Jolly Jumper
- 2.18 Kaprekar Numbers
- 2.19 L33tspeak Translator
- 2.20 Letters in Alphabetical Order
- 2.21 In what year were most presidents alive?
- 2.22 Making numbers palindromic
- 2.23 Pandigital Roman Numbers
- 2.24 Pronouncing Hexadecimal
- 2.25 Reverse Factorial
- 2.26 Roller Coaster Words
- 2.27 Ruth-Aaron Pairs
- 2.28 Calculating Shannon Entropy of a String
- 2.29 Shuffling a List
- 2.30 Spelling with Chemistry
- 2.31 Playing the Stock Market
- 2.32 Thue-Morse Sequence Generator
- 2.33 Vampire Numbers
- 2.34 XOR Multiplication
- 2.35 Finding Amicable Numbers
- 2.36 Making Imgur-style Links
- 2.37 Capitalize The First Letter of Every Word
- 2.38 Closest String
- 2.39 Collatz Conjecture
- 2.40 Double (or More) Knots
- 2.41 Emirp Numbers
- 2.42 Evil Numbers
- 2.43 Extravagant Numbers
- 2.44 Finding the Freshest Eggs
- 2.45 Harshad Number
- 2.46 Integer Sequence Search Part
- 2.47 Isomorphic Words
- 2.48 Kolakoski Sequence Generator
- 2.49 Lipogram Detector
- 2.50 Longest Palindromic Substring
- 2.51 Longest Repeated Substring
- 2.52 Narcissistic numbers
- 2.53 Regular Paperfold Sequence Generator
- 2.54 Pell Numbers
- 2.55 Perfect Numbers
- 2.56 Primes in Grids
- 2.57 Summing Across the Rudin-Shapiro Sequence
- 2.58 Safe Prime Numbers
- 2.59 Typo Maker
- 2.60 Wedderburn-Etherington Sequence
- 3 Intermediate
- Introduction
- 3.2 Anagram Maker
- 3.3 ASCII85 Encoding and Decoding
- 3.4 ASCII Histogram Maker: Part 1 - The Simple Bar Chart
- 3.5 Where Should Grandma’s House Go?
- 3.6 Connect Four
- 3.7 Calculating De Bruijn sequences
- 3.8 Detecting Four Sided Figures
- 3.9 Bioinformatics 2: DNA Restriction Enzymes
- 3.10 Elggob - Make a Boggle Layout
- 3.11 Balancing My Spending
- 3.12 Maximizing Crop Irrigation
- 3.13 Graph Radius and Diameter
- 3.14 Gray Code
- 3.15 IPv4 Subnet Calculator
- 3.16 Comparing Rotated Words
- 3.17 Linear Feedback Shift Register
- 3.18 Training for Summiting Everest
- 3.19 Generating Text with Markov Processes
- 3.20 Packing a Sentence in a Box
- 3.21 Packing Stacks of Boxes
- 3.22 Parsing Postal Addresses
- 3.23 Generating Polyominoes
- 3.24 Punch Card Creator
- 3.25 Scrabble in Reverse
- 3.26 Finding Legal Reversi Moves
- 3.27 Set Game Solver
- 3.28 Write a Web Client
- 3.29 Listening for Incoming Aircraft
- 3.30 Red Squiggles
- 3.31 Simple Stream Cipher
- 3.32 Use a Web Service to Find Bitcoin Prices
- 3.33 Word Squares Part 1
- 3.34 Worm Wars 1 - Basic Epidemiology
- 3.35 Zeckendorf Representations of Positive Integers
- 3.36 Finding Ancestors
- 3.37 Encoding with the Beale Cipher
- 3.38 Bifid Cipher
- 3.39 Sturdy Brick Walls
- 3.40 Calkin-Wilf Tree
- 3.41 Change Ringing
- 3.42 Counting Maximal Length Palindromes
- 3.43 Fencing In the Birds
- 3.44 Constructing Cyclic Numbers
- 3.45 Cyclic Words
- 3.46 Sorting Dienes Tiles
- 3.47 Tallest Tower from a List of Digits
- 3.48 The Ducci Sequence
- 3.49 The Ehrenfeucht-Mycielski sequence (0,1-version)
- 3.50 Math Snake
- 3.51 Calculating the Farey Sequence
- 3.52 Fibonacci Word Fractals
- 3.53 Friedman numbers
- 3.54 Goldbach’s Weak Conjecture
- 3.55 Hitori Solver
- 3.56 Laser in a Box
- 3.57 Longest Alternating Subsequence
- 3.58 Needles in Haystacks
- 3.59 Magic Squares
- 3.60 Mathagrams
- 3.61 Picture Spot
- 3.62 Finding Numbers with Manners
- 3.63 Polydivisble Numbers
- 3.64 Primes in Several Bases
- 3.65 Singles
- 3.66 Slitherlink
- 3.67 Spinning Gears
- 3.68 Spoonerism
- 3.69 English Word Syllbalizer
- 3.70 Tile Shuffling
- 3.71 Trees in the Park
- 3.72 Two for One
- 3.73 Calculating Ulam Numbers
- 3.74 Unique County Names
- 3.75 Unwrap Some Text
- 3.76 Vaki Puzzle Solver
- 3.77 Well, Well, Well
- 3.78 Longest Word in a Box
- 3.79 XOR Decoding
- 3.80 Zombies Invaded my Village
- 4 Hard
- Introduction
- 8 Puzzle
- 4.3 ASCII Histogram Maker: Part 2 - The Proper Histogram
- 4.4 Coiled sentence
- 4.5 Calculating Costas Arrays
- 4.6 Customer Unit Delivery Scheduling
- 4.7 DNA Shotgun Sequencing
- 4.8 Elevator Scheduling
- 4.9 Finding Friends in the Social Graph
- 4.10 Generate Strings to Match a Regular Expression
- 4.11 Golomb Rulers
- 4.12 Gophers and Robot Dogs
- 4.13 The Guards and the Mansion
- 4.14 Guarding the Coast
- 4.15 Hue Drops Puzzle
- 4.16 Kakuro Solver
- 4.17 Kanoodle Solver
- 4.18 KenKen Solver
- 4.19 Severing the Power Grid
- 4.20 Museum Cameras
- 4.21 Nonogram Solver
- 4.22 Finding Point Nemo
- 4.23 Procedural Dungeon Generation
- 4.24 Bioinformatics 3: Predicting Protein Secondary Structures
- 4.25 Rush Hour Solver
- 4.26 DNA and Protein Sequence Alignment
- 4.27 Redistricting Voting Blocks
- 4.28 Snake in a Box
- 4.29 Eight Husbands for Eight Sisters
- 4.30 Static HTTP Server
- 4.31 New York Street Sweeper Paths
- 4.32 Subset Sum Automata
- 4.33 Implementing a Templating Engine
- 4.34 Text Summarizer
- 4.35 Longest Uncrossed Knight’s Path
- 4.36 Van der Waerden numbers
- 4.37 Write a Web Crawler
- 4.38 Word Squares Part 2
- 4.39 Worm Wars 2 - Network Epidemiology
- 4.40 Mission Impossible: Fooling the Anomaly Detector and Exfiltrating Data
- 4.41 Chess Solitaire
- 4.42 Calculate Graph Chromatic Number
- 4.43 Congruent Numbers
- 4.44 Glass Cutting Optimization
- 4.45 Drainage Ditches
- 4.46 Comparing Graphs
- 4.47 Buying Groceries
- 4.48 Integer Sequence Search Part 2
- 4.49 Number Grid Puzzles
- 4.50 Nurikabe Puzzle Solver
- 4.51 Implement Basic RSA Public Key Encryption
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