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CodeEval (Defunct) Problem Statements

As of 2018-02-12, CodeEval has ceased operations. This (unofficial) repository mirrors* the problem statements for all 239‡ interactive challenges that once lived on the platform.

* A couple of problem statements are missing animated GIFs which I don't have a backup of. They were supplementary and are not required to solve the challenges in question.

‡ Technically, there were 240 challenges on the platform. Challenge #127 ("Code Plagiarism") wasn't an interactive/graded challenge; thus no points were awarded for it by the online evaluation system.

Easy (35 Points)

CID Name Synopsis
152 Age Distribution Print out where the person is
082 Armstrong Numbers Determine if a number is an armstrong number
083 Beautiful Strings Facebook Hacker Cup 2013 problem
163 Big Digits Print out magnified digits using pseudographics
019 Bit Positions Bits in position x,y are same or different
222 Black Card Find the winner
099 Calculate Distance Calculate a distance between two points
093 Capitalize Words Capitalize words in a sentence
211 Chardonnay or Cabernet Guess a wine name
205 Clean Up the Words Print the words separated by spaces
192 Compare Points Given two (x, y) points A and B, determine which cardinal direction B is from A
128 Compressed Sequence Write a program that compresses a sequence of numbers
140 Data Recovery Reconstruct a sentence using hints
166 Delta Time Find the time difference
183 Details Determine how many cells will be shifted detail
100 Even Numbers Determine if a number is even or not
022 Fibonacci Series Print out the nth fibonacci number
026 File Size Print the file size in bytes
097 Find a Writer Find a famous writer in a string
208 Find the Highest Score Find the highest rate in the table
001 Fizz Buzz A simple game involving divisibility tests
230 Football Find countries that are football fans
039 Happy Numbers Determine if a number is a happy number or not
067 Hex to Decimal Convert a hex number to it's decimal equivalent
122 Hidden Digits Try to look behind the scenes
102 JSON Menu IDs Calculate IDs in JSON menu
149 Juggling With Zeros Convert a zero-based number into integer
180 Knight Moves Find positions for the next move of the knight
147 Lettercase Percentage Ratio Find the percentage ratio
111 Longest Word Get the longest word in a sentence
020 Lowercase Lowercase text
103 Lowest Unique Number Find the lowest unique number in a set
178 Matrix Rotation Rotate a 2D matrix 90 degrees clockwise
186 Max Range Sum Determine max sum at the range
240 Mersenne Prime Find all Mersenne numbers smaller than n
189 Minimum Distance Find a point with the smallest sum of distances to every given point
115 Mixed Content Separate words with digits
116 Morse Code Decode Morse code
018 Multiples of a Number Multiples of a number greater than another number
023 Multiplication Tables Print out the grade school multiplication table upto 12*12
113 Multiply Lists Multiply elements in 2 lists
062 N Mod M Determine the modulus (without the modulus operator)
160 Nice Angles Convert angle values to sexagesimal format
232 Not So Clever Simplicity is not always good
025 Odd Numbers Print the odd numbers from 1 to 99
217 One Zero, Two zeros... Count zeros in a binary system
237 Panacea - Truth or Lie Check whether the virus was stopped by antivirus
092 Penultimate Word Find the next-to-last word
003 Prime Palindrome Biggest prime palindrome < 1000
087 Query Board Set and get values from a matrix using tiny DSL
136 Racing Chars Explore a race track avoiding crashes
167 Read More Limit the length of the text
227 Real Fake Check credit card numbers
008 Reverse Words Reversing an input sequence of words
031 Rightmost Char Print the position of the rightmost occurrence of a char
124 Road Trip Do not be left without petrol
156 Roller Coaster Turn the text into RoLlErCoAsTeR case
106 Roman Numerals Convert a cardinal number to a Roman numeral
040 Self Describing Numbers Determine if a number is a self-describing number or not
030 Set Intersection Print the intersection of two sets of numbers
107 Shortest Repetition Find the shortest repetition in a string
235 Simple or Trump Check which card is higher
091 Simple Sorting Sort several numbers
174 Slang Flavor Add some slang to the text
131 Split the Number Evaluate the number according to the pattern
202 Stepwise Word Print the longest word in a stepwise manner
199 String Mask Change case letters by mask
203 Strings and Arrows Print the number of arrows in a string
021 Sum of Digits Sum of digits comprising a number
024 Sum of Integers From File Print the sum of integers read from a file
004 Sum of Primes Sum of first 1000 primes
096 Swap Case Swap case in a string
112 Swap Elements Swap elements in a list
196 Swap Numbers Swap numbers surrounding a word
225 Testing Wanna try to be a tester?
132 The Major Element Find the major element in a sequence
214 Time to Eat Sort timestamps in the right order
220 Trick or Treat Count all candies
029 Unique Elements Extract unique list from a sorted list of numbers
173 Without Repetitions Delete characters that are consistently repeated
104 Word to Digit Substitute words to digits
139 Working Experience Retrieve an actual value

Moderate (65 Points)

CID Name Synopsis
117 A Pile of Bricks Close a hole in a wall
223 Alternative Reality Count all alternative ways
041 Array Absurdity Determine if an array contains a duplicated entry
084 Balanced Smileys Facebook Hacker Cup 2013 problem
146 Bats Challenge Count bats on the wire
236 Beat or Bit Learn more about the Gray code algorithm
209 Black or White Find the smallest submatrix
179 Broken LCD Determine whether a given number can be displayed on the damaged LCD
218 Builders Team Count all squares on the map
184 Burrows-Wheeler Transform Complete file decompression by inverting BWT
138 Car Race Determine the fastest car
172 Card Number Validation Check if bank card numbers are valid
054 Cash Register Determine the amount of change to be returned
119 Chain Inspection Try to pass a chain
133 City Blocks Flyover Chart the path of a helicopter from above to discover how many city blocks it flew over
238 Code Combinations Check whether you can make words from the given letters
148 Color Code Converter Determine and convert the color code
197 Column Names Convert integer to excel-style column name
187 Consecutive Primes Determine how many ways the numbers can be arranged such that every consecutive pair sums to a prime
063 Counting Primes Count the number of primes between two integers
027 Decimal to Binary Print the binary representation of a decimal number
073 Decode Numbers Count the number of ways to decode a string
005 Detecting Cycles Detecting loops within a sequence
033 Double Squares FaceBook Hacker Cup 2011: Output the number of ways to write X as the sum of two squares
215 Double Trouble Calculate the number of correct variants for messages
035 Email Validation Write a regular expression to validate an email address
015 Endianness Determine the endianness of a system
169 Filename Pattern Filter a list of filenames
101 Find a Square Do 4 points make a square?
012 First Non-Repeated Character Find the first non repeated character in a string
075 Flavius Josephus Eliminate every i'th item from a circular list
161 Game of Life Implement the classical cellular automaton game
181 Gronsfeld Cipher Decipher the message enciphered with the Gronsfeld cipher
170 Guess the Number Guess the number in log2(N) steps
158 Interrupted Bubble Sort Sort a list of elements, partially
043 Jolly Jumpers Determine if a sequence of numbers is a Jolly Jumper
177 Justify the Text Align the text to the specified width
153 Locks Calculate unlocked doors
002 Longest Lines Finding the 'N' longest lines within a file
121 Lost in Translation Try to become a native speaker
011 Lowest Common Ancestor Determine the lowest common ancestor within a tree
206 Lucky Tickets Count the lucky tickets
193 Magic Numbers Print out a list of all the magic numbers in a provided range
231 Meet Cocktail Sort Learn more about cocktail sort algorithm
233 Meet Comb Sort Learn more about the comb sort algorithm
074 Minimum Coins Find the minimum number of coins to arrive at a total
010 Mth to Last Element Determine the Mth to last element of a list
016 Number of Ones Determine the number of one bits in an integer
190 Number Operations Determine if it is possible to produce the number 42 with five cards
034 Number Pairs Find pairs of numbers in a sorted array whose sum is X
221 Organizational Hierarchy Recreate the hierarchy tree
070 Overlapping Rectangles Determine if two rectangles overlap
037 Pangrams Find the missing alphabets
066 Pascals Triangle Print out pascals triangle upto a certain depth
089 Pass Triangle Lead the way within the triangle
098 Point in Circle Define whether a point is in a circle
125 Predict the Number Try to go beyond the limits
046 Prime Numbers Print prime numbers less than N
013 Remove Characters Delete specific characters from a string
045 Reverse and Add Continually add a number to its reverse to arrive at a palindrome
071 Reverse Groups Reverse elements in a list k items at a time
212 Robo and Robitta Count all nuts
150 Roman and Arabic Calculate aromatic numbers
137 Seek for an Intruder Find the IP address of an intruder
130 Sequence Transformation Transform a binary sequence into a string
094 Simple Calculator Create a simple calculator
200 Sort Matrix Columns Sort matrix columns from lowest to highest numbers
009 Stack Implementation Implement a stack interface
076 String Rotation Find if a string is the rotation of another string
078 Sudoku Determine if a grid layout is a valid sudoku solution
165 Suggest Groups Help your friends to join groups
017 Sum of Integers Determine the largest sum of contiguous integers in an array
081 Sum to Zero Count of ways in which the sum of four numbers is zero
143 The Ministry of Truth Your task is to help the Big Brother
228 To PI or Not to PI Print a PI number
032 Trailing String Determine if a string 'B' occurs at the end of string 'A'
226 Try to Solve It How good decoder are you?
194 Twenty Forty Eight Implement the 2048 game logic
080 URI Comparison Determine if two URIs match
068 Valid Parentheses Determine if string is a well-formed parentheses
135 Word Chain Find the longest chain of words

Hard (100 Points)

CID Name Synopsis
134 A Bus Network Try to save more time
095 Advanced Calculator Create an advanced calculator
201 Alphabet Blocks Forming words from alphabet blocks
239 As Quick as a Flash Learn more about the quick sort algorithm
155 ASCII Decryption Decrypt a message
109 Bay Bridges Build Bridges Over San Francisco Bay
210 Brainf*ck Blow your mind
064 Climbing Stairs Count the number of ways to climb to the top of a staircase
051 Closest Pair Given a set of points in a two dimensional space, you will have to find the distance between the closest two points
234 Code Like Huffman Learn more about Huffman's tree
127 Code Plagiarism Compare source code of two programs
090 Commuting Engineer Travelling Salesman Problem
108 Computer Terminal Print text to terminal with control sequences
151 Cracking Eggs Determine the number of drops
195 Crime House Count criminals in the Crime House
077 Da Vyncy Recreate a document from a set of fragments
061 Decryption Determine the plain text message from an encrypted string
144 Digit Statistics Find statistics in sequence
048 Discount Offers Determine optimal pairing of customers with products
069 Distinct Subsequences Determine the number of distinct subsequnces within a string
188 Distinct Triangles Find the number of distinct triangles formed in a graph
171 DNA Alignment Find the highest score of DNA sequences alignment
123 Efficient Delivery Load your tankers with oil
216 Everything or Nothing Check if a code is correct
085 Find Min Facebook Hacker Cup 2013 problem
141 Flight 370 Follow the current search results
044 Following Integer Determine the next number in a sequence
185 Glue Shredded Pieces Reconstruct the original text from overlapping pieces
060 Grid Walk The number of grid points that can be accessed
229 Grinch Help Grinch to find the shortest way
154 IP Package Calculate IP checksum
088 Juggle Fest A challenge from Yodle
213 Lakes, Not Cakes Count all lakes
105 Largest Sub-Matrix Determine the largest sub-matrix in a matrix
198 Less Money, More Problems Help citizens by adding new coin denominations
058 Levenshtein Distance Find out how big the social network of a word is
191 Lights Out Switch all the lights off with minimum number of moves
006 Longest Common Subsequence LCS between two strings
182 Longest Path Find the longest path of unique elements
164 Mars Networks Find the minimum length of the optical fiber cable which connects probes to a network
036 Message Decoding Decode an encoded message
079 Minesweeper Find the mines within a M*N matrix
072 Minimum Path Sum Calculate the minimum sum of a path through a matrix
114 Package Problem Put as many things into a package as possible
047 Palindromic Ranges Find out a range of palindromic numbers
049 Peak Traffic Finding out which friends you interact with most
126 Play With DNA Write an algorithm that a finds DNA segment in a given DNA string
086 Poker Hands Compare two poker hands
007 Prefix Expressions Evaluating a prefix expression
224 Prisoner or Citizen In jail or at large?
176 Ray of Light Trace the path of light distribution
053 Repeated Substring Find the longest repeated substring in a given text
056 Robot Movements Number of ways a robot can reach its destination
129 Routing Problem Find all the shortest paths for the package between two specified hosts
145 Running for President Build your strategy to win the Presidency of the United States
118 Seat Your Team Members Place the employees in a new office
120 Skyscrapers Outline skyscrapers in a city
057 Spiral Printing Print out a 2D array in spiral order
204 Straight Lines Print the number of straight lines
038 String List Create a new string from constituent alphabets
014 String Permutations Print out all permutations of a string
028 String Searching Determine if substring match exists
050 String Substitution Create a new string by replacing substrings within it
059 Telephone Words Print out the words corresponding to a telephone number
052 Text Dollar Print out the text dollar amount of a given quantity
110 Text to Number Convert English text representation of a number to a decimal number
175 The Cubes Find the length of the shortest way in the multilevel labyrinth
168 The Frequency Find the signals frequency
157 The Labyrinth Find the shortest way to exit
219 The Tourist Find the shortest route between cities
162 Too Unique Find and mark the biggest submatrices of unique elements
055 Type Ahead Building a type ahead feature
042 Ugly Numbers Count the number of expressions that can be created from a number
142 Visit to the Headquarters Organize the queues
159 Where Is Wi-Fi Find out in which buildings there are hotspots
207 Which Way Is Faster? Find the fastest way
065 Word Search Find if a word exists in a grid

License and Copyright

All original work is released under the MIT license, unless otherwise specified.

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