• Challenges
  • Algorithms
  • Recently Added

    Plus MinusNot Completed

    Solutions: 33 | View user solutions | Added 08/04/17

    Wildcard CharactersNot Completed

    Solutions: 23 | View user solutions | Added 07/22/17

    Palindrome SwapperNot Completed

    Solutions: 88 | View user solutions | Added 07/16/17

    You have access to 10 free challenges and solutions below

    Easy Difficulty

    First ReverseNot Completed

    Solutions: 79087 | Step-by-step solution | Challenge discussion

    First FactorialNot Completed

    Solutions: 54421 | Step-by-step solution | Challenge discussion

    Longest WordNot Completed

    Solutions: 41637 | Step-by-step solution | Challenge discussion

    Letter ChangesNot Completed

    Solutions: 43760 | Step-by-step solution | Challenge discussion

    Simple AddingNot Completed

    Solutions: 36385 | Step-by-step solution | Challenge discussion

    Letter CapitalizeNot Completed

    Solutions: 30973 | Step-by-step solution | Challenge discussion

    Simple SymbolsNot Completed

    Solutions: 24647 | Step-by-step solution | Challenge discussion

    Check NumsNot Completed

    Solutions: 26275 | Step-by-step solution | Challenge discussion

    Time ConvertNot Completed

    Solutions: 19837 | Step-by-step solution | Challenge discussion

    Alphabet SoupNot Completed

    Solutions: 18651 | Step-by-step solution | Challenge discussion

    AB CheckNot Completed

    Solutions: 15437 | Step-by-step solution | Challenge discussion

    Vowel CountNot Completed

    Solutions: 14533 | Step-by-step solution | Challenge discussion

    Word CountNot Completed

    Solutions: 13721 | Step-by-step solution | Challenge discussion

    Ex OhNot Completed

    Solutions: 13261 | Step-by-step solution | Challenge discussion

    PalindromeNot Completed

    Solutions: 15399 | Step-by-step solution | Challenge discussion

    Arith GeoNot Completed

    Solutions: 12174 | Step-by-step solution | Challenge discussion

    Array Addition INot Completed

    Solutions: 7603 | Step-by-step solution | Challenge discussion

    Letter Count INot Completed

    Solutions: 6966 | Step-by-step solution | Challenge discussion

    Second GreatLowNot Completed

    Solutions: 11716 | Step-by-step solution | Challenge discussion

    Division StringifiedNot Completed

    Solutions: 8795 | Step-by-step solution | Challenge discussion

    Counting Minutes INot Completed

    Solutions: 5192 | Step-by-step solution | Challenge discussion

    Mean ModeNot Completed

    Solutions: 6891 | Step-by-step solution | Challenge discussion

    Dash InsertNot Completed

    Solutions: 7799 | Step-by-step solution | Challenge discussion

    Swap CaseNot Completed

    Solutions: 7528 | Step-by-step solution | Challenge discussion

    Number AdditionNot Completed

    Solutions: 7243 | Step-by-step solution | Challenge discussion

    Third GreatestNot Completed

    Solutions: 6722 | Step-by-step solution | Challenge discussion

    Powers of TwoNot Completed

    Solutions: 7606 | Step-by-step solution | Challenge discussion

    Additive PersistenceNot Completed

    Solutions: 5247 | Step-by-step solution | Challenge discussion

    Multiplicative PersistenceNot Completed

    Solutions: 4089 | Step-by-step solution | Challenge discussion

    Off Line MinimumNot Completed

    Solutions: 5461 | Step-by-step solution | Challenge discussion

    Changing SequenceNot Completed

    Solutions: 1946 | Step-by-step solution | Challenge discussion

    Overlapping RangesNot Completed

    Solutions: 1967 | Step-by-step solution | Challenge discussion

    SuperincreasingNot Completed

    Solutions: 1960 | Step-by-step solution | Challenge discussion

    Hamming DistanceNot Completed

    Solutions: 1326 | Step-by-step solution | Challenge discussion

    Rectangle AreaNot Completed

    Solutions: 1622 | Step-by-step solution | Challenge discussion

    Bitwise OneNot Completed

    Solutions: 1320 | Step-by-step solution | Challenge discussion

    Other ProductsNot Completed

    Solutions: 1285 | Step-by-step solution | Challenge discussion

    Wave SortingNot Completed

    Solutions: 801 | Step-by-step solution | Challenge discussion

    Array MatchingNot Completed

    Solutions: 940 | Step-by-step solution | Challenge discussion

    Binary ReversalNot Completed

    Solutions: 813 | Step-by-step solution | Challenge discussion

    Longest Increasing SequenceNot Completed

    Solutions: 757 | Step-by-step solution | Challenge discussion

    Even PairsNot Completed

    Solutions: 712 | Step-by-step solution | Challenge discussion

    Next PalindromeNot Completed

    Solutions: 648 | Step-by-step solution | Challenge discussion

    Largest PairNot Completed

    Solutions: 992 | Step-by-step solution | Challenge discussion

    Nonrepeating CharacterNot Completed

    Solutions: 666 | Step-by-step solution | Challenge discussion

    Two SumNot Completed

    Solutions: 1152 | Step-by-step solution | Challenge discussion

    Bitwise TwoNot Completed

    Solutions: 457 | Step-by-step solution | Challenge discussion

    Power Set CountNot Completed

    Solutions: 751 | Step-by-step solution | Challenge discussion

    Product DigitsNot Completed

    Solutions: 994 | Step-by-step solution | Challenge discussion

    Palindrome CreatorNot Completed

    Solutions: 695 | Step-by-step solution | Challenge discussion

    Basic Roman NumeralsNot Completed

    Solutions: 479 | Step-by-step solution | Challenge discussion

    Food DistributionNot Completed

    Solutions: 364 | Step-by-step solution | Challenge discussion

    Three SumNot Completed

    Solutions: 451 | Step-by-step solution | Challenge discussion

    Correct PathNot Completed

    Solutions: 230 | Step-by-step solution | Challenge discussion

    Scale BalancingNot Completed

    Solutions: 385 | Step-by-step solution | Challenge discussion

    Three NumbersNot Completed

    Solutions: 382 | Step-by-step solution | Challenge discussion

    Alphabet SearchingNot Completed

    Solutions: 359 | Step-by-step solution | Challenge discussion

    Time DifferenceNot Completed

    Solutions: 206 | Step-by-step solution | Challenge discussion

    Triangle RowNot Completed

    Solutions: 200 | Step-by-step solution | Challenge discussion

    Vowel SquareNot Completed

    Solutions: 245 | Step-by-step solution | Challenge discussion

    Closest EnemyNot Completed

    Solutions: 299 | Step-by-step solution | Challenge discussion

    Closest Enemy IINot Completed

    Solutions: 142 | Step-by-step solution | Challenge discussion

    Number StreamNot Completed

    Solutions: 160 | Step-by-step solution | Challenge discussion

    Largest FourNot Completed

    Solutions: 300 | Step-by-step solution | Challenge discussion

    Distinct CharactersNot Completed

    Solutions: 205 | Step-by-step solution | Challenge discussion

    Questions MarksNot Completed

    Solutions: 306 | Step-by-step solution | Challenge discussion

    Camel CaseNot Completed

    Solutions: 225 | Step-by-step solution | Challenge discussion

    ASCII ConversionNot Completed

    Solutions: 144 | Step-by-step solution | Challenge discussion

    Simple EvensNot Completed

    Solutions: 228 | Step-by-step solution | Challenge discussion

    Snake CaseNot Completed

    Solutions: 195 | Step-by-step solution | Challenge discussion

    Sum MultiplierNot Completed

    Solutions: 260 | Step-by-step solution | Challenge discussion

    String MergeNot Completed

    Solutions: 233 | Step-by-step solution | Challenge discussion

    One DecrementedNot Completed

    Solutions: 226 | Step-by-step solution | Challenge discussion

    Element MergerNot Completed

    Solutions: 253 | Step-by-step solution | Challenge discussion

    GCFNot Completed

    Solutions: 217 | Step-by-step solution | Challenge discussion

    Serial NumberNot Completed

    Solutions: 206 | Step-by-step solution | Challenge discussion

    String PeriodsNot Completed

    Solutions: 177 | Step-by-step solution | Challenge discussion

    Palindrome SwapperNot Completed

    Solutions: 88 | Step-by-step solution | Challenge discussion

    Become a Premium Member

    With our large collection of challengs, tutorials, and solutions, we make it easy for you to become a better coder, prepare for interviews, and learn new skills from more experienced coders.

    “I got my App Academy acceptance yesterday, and Coderbyte was definitely a huge help.” ― Tomer
    • 200+ Coding Challenges
    • Mock Interview Questions
    • 500,000+ Code Solutions
    • Algorithm Tutorials
    • Interview Prep Courses

    Medium Difficulty

    Prime TimeNot Completed

    Solutions: 11368 | Step-by-step solution | Challenge discussion

    Run Length Not Completed

    Solutions: 7904 | Step-by-step solution | Challenge discussion

    Prime MoverNot Completed

    Solutions: 7037 | Step-by-step solution | Challenge discussion

    Palindrome TwoNot Completed

    Solutions: 6617 | Step-by-step solution | Challenge discussion

    DivisionNot Completed

    Solutions: 6220 | Step-by-step solution | Challenge discussion

    String ScrambleNot Completed

    Solutions: 6702 | Step-by-step solution | Challenge discussion

    Arith Geo IINot Completed

    Solutions: 4665 | Step-by-step solution | Challenge discussion

    Array AdditionNot Completed

    Solutions: 3933 | Step-by-step solution | Challenge discussion

    Binary ConverterNot Completed

    Solutions: 4261 | Step-by-step solution | Challenge discussion

    Letter CountNot Completed

    Solutions: 4083 | Step-by-step solution | Challenge discussion

    Simple ModeNot Completed

    Solutions: 4638 | Step-by-step solution | Challenge discussion

    Caesar CipherNot Completed

    Solutions: 4700 | Step-by-step solution | Challenge discussion

    Formatted DivisionNot Completed

    Solutions: 3497 | Step-by-step solution | Challenge discussion

    ConsecutiveNot Completed

    Solutions: 3807 | Step-by-step solution | Challenge discussion

    Counting MinutesNot Completed

    Solutions: 2544 | View all user solutions | Challenge discussion

    Permutation StepNot Completed

    Solutions: 3020 | View all user solutions | Challenge discussion

    Prime CheckerNot Completed

    Solutions: 2297 | View all user solutions | Challenge discussion

    Dash Insert IINot Completed

    Solutions: 4578 | View all user solutions | Challenge discussion

    Swap IINot Completed

    Solutions: 2513 | View all user solutions | Challenge discussion

    Number SearchNot Completed

    Solutions: 3069 | View all user solutions | Challenge discussion

    Triple DoubleNot Completed

    Solutions: 2859 | View all user solutions | Challenge discussion

    Bracket MatcherNot Completed

    Solutions: 2617 | View all user solutions | Challenge discussion

    String ReductionNot Completed

    Solutions: 2166 | View all user solutions | Challenge discussion

    Coin DeterminerNot Completed

    Solutions: 2126 | View all user solutions | Challenge discussion

    ThreeFive MultiplesNot Completed

    Solutions: 2629 | View all user solutions | Challenge discussion

    Fibonacci CheckerNot Completed

    Solutions: 2472 | View all user solutions | Challenge discussion

    Multiple BracketsNot Completed

    Solutions: 2111 | View all user solutions | Challenge discussion

    Most Free TimeNot Completed

    Solutions: 1290 | View all user solutions | Challenge discussion

    Overlapping RectanglesNot Completed

    Solutions: 1464 | View all user solutions | Challenge discussion

    Distinct ListNot Completed

    Solutions: 2222 | View all user solutions | Challenge discussion

    Look Say SequenceNot Completed

    Solutions: 1317 | View all user solutions | Challenge discussion

    Number EncodingNot Completed

    Solutions: 1358 | View all user solutions | Challenge discussion

    Stock PickerNot Completed

    Solutions: 574 | View all user solutions | Challenge discussion

    Max SubarrayNot Completed

    Solutions: 471 | View all user solutions | Challenge discussion

    Missing DigitNot Completed

    Solutions: 316 | View all user solutions | Challenge discussion

    K Unique CharactersNot Completed

    Solutions: 308 | View all user solutions | Challenge discussion

    Bitmap HolesNot Completed

    Solutions: 229 | View all user solutions | Challenge discussion

    Symmetric TreeNot Completed

    Solutions: 193 | View all user solutions | Challenge discussion

    Binary Search Tree LCANot Completed

    Solutions: 174 | View all user solutions | Challenge discussion

    Binary Tree LCANot Completed

    Solutions: 98 | View all user solutions | Challenge discussion

    LRU CacheNot Completed

    Solutions: 118 | View all user solutions | Challenge discussion

    Tree ConstructorNot Completed

    Solutions: 104 | View all user solutions | Challenge discussion

    Array Min JumpsNot Completed

    Solutions: 155 | View all user solutions | Challenge discussion

    Nearest Smaller ValuesNot Completed

    Solutions: 297 | View all user solutions | Challenge discussion

    Matrix SpiralNot Completed

    Solutions: 126 | View all user solutions | Challenge discussion

    Word SplitNot Completed

    Solutions: 243 | View all user solutions | Challenge discussion

    Pair SearchingNot Completed

    Solutions: 74 | View all user solutions | Challenge discussion

    Boggle SolverNot Completed

    Solutions: 52 | View all user solutions | Challenge discussion

    HTML ElementsNot Completed

    Solutions: 86 | View all user solutions | Challenge discussion

    Missing Digit IINot Completed

    Solutions: 95 | View all user solutions | Challenge discussion

    Palindromic SubstringNot Completed

    Solutions: 154 | View all user solutions | Challenge discussion

    Trapping WaterNot Completed

    Solutions: 93 | View all user solutions | Challenge discussion

    Matrix PathNot Completed

    Solutions: 55 | View all user solutions | Challenge discussion

    Seating StudentsNot Completed

    Solutions: 80 | View all user solutions | Challenge discussion

    Longest Matrix PathNot Completed

    Solutions: 39 | View all user solutions | Challenge discussion

    Min Window SubstringNot Completed

    Solutions: 93 | View all user solutions | Challenge discussion

    Matrix ChainsNot Completed

    Solutions: 40 | View all user solutions | Challenge discussion

    Histogram AreaNot Completed

    Solutions: 60 | View all user solutions | Challenge discussion

    Matching CharactersNot Completed

    Solutions: 92 | View all user solutions | Challenge discussion

    Ternary ConverterNot Completed

    Solutions: 51 | View all user solutions | Challenge discussion

    Linear CongruenceNot Completed

    Solutions: 29 | View all user solutions | Challenge discussion

    Formatted NumberNot Completed

    Solutions: 108 | View all user solutions | Challenge discussion

    Largest Row ColumnNot Completed

    Solutions: 25 | View all user solutions | Challenge discussion

    Eight QueensNot Completed

    Solutions: 48 | View all user solutions | Challenge discussion

    Three PointsNot Completed

    Solutions: 68 | View all user solutions | Challenge discussion

    Character RemovalNot Completed

    Solutions: 77 | View all user solutions | Challenge discussion

    Simple PasswordNot Completed

    Solutions: 106 | View all user solutions | Challenge discussion

    Preorder TraversalNot Completed

    Solutions: 33 | View all user solutions | Challenge discussion

    String ZigzagNot Completed

    Solutions: 55 | View all user solutions | Challenge discussion

    Off BinaryNot Completed

    Solutions: 46 | View all user solutions | Challenge discussion

    Longest ConsecutiveNot Completed

    Solutions: 181 | View all user solutions | Challenge discussion

    String ExpressionNot Completed

    Solutions: 81 | View all user solutions | Challenge discussion

    Charlie the DogNot Completed

    Solutions: 25 | View all user solutions | Challenge discussion

    Plus MinusNot Completed

    Solutions: 33 | View all user solutions | Challenge discussion

    Hard Difficulty

    Shortest PathNot Completed

    Solutions: 989 | View all user solutions | Challenge discussion

    Pattern ChaserNot Completed

    Solutions: 658 | View all user solutions | Challenge discussion

    CalculatorNot Completed

    Solutions: 1076 | View all user solutions | Challenge discussion

    Weighted PathNot Completed

    Solutions: 324 | View all user solutions | Challenge discussion

    Intersecting LinesNot Completed

    Solutions: 524 | View all user solutions | Challenge discussion

    RREF MatrixNot Completed

    Solutions: 112 | View all user solutions | Challenge discussion

    Polynomial ExpansionNot Completed

    Solutions: 269 | View all user solutions | Challenge discussion

    Gas StationNot Completed

    Solutions: 532 | View all user solutions | Challenge discussion

    Symmetric MatrixNot Completed

    Solutions: 370 | View all user solutions | Challenge discussion

    Switch SortNot Completed

    Solutions: 262 | View all user solutions | Challenge discussion

    Matrix DeterminantNot Completed

    Solutions: 244 | View all user solutions | Challenge discussion

    Queen CheckNot Completed

    Solutions: 422 | View all user solutions | Challenge discussion

    Noughts DeterminerNot Completed

    Solutions: 352 | View all user solutions | Challenge discussion

    Blackjack HighestNot Completed

    Solutions: 472 | View all user solutions | Challenge discussion

    Transitivity RelationsNot Completed

    Solutions: 398 | View all user solutions | Challenge discussion

    Alphabet Run EncryptionNot Completed

    Solutions: 227 | View all user solutions | Challenge discussion

    Knight JumpsNot Completed

    Solutions: 496 | View all user solutions | Challenge discussion

    Line OrderingNot Completed

    Solutions: 48 | View all user solutions | Challenge discussion

    Sudoku Quadrant CheckerNot Completed

    Solutions: 95 | View all user solutions | Challenge discussion

    Quick KnightNot Completed

    Solutions: 41 | View all user solutions | Challenge discussion

    Square FiguresNot Completed

    Solutions: 121 | View all user solutions | Challenge discussion

    Connect Four WinnerNot Completed

    Solutions: 65 | View all user solutions | Challenge discussion

    Array JumpingNot Completed

    Solutions: 50 | View all user solutions | Challenge discussion

    Matrix BorderNot Completed

    Solutions: 53 | View all user solutions | Challenge discussion

    Roman Numeral ReductionNot Completed

    Solutions: 63 | View all user solutions | Challenge discussion

    Parallel SumsNot Completed

    Solutions: 100 | View all user solutions | Challenge discussion

    LCSNot Completed

    Solutions: 58 | View all user solutions | Challenge discussion

    Nim WinnerNot Completed

    Solutions: 41 | View all user solutions | Challenge discussion

    Farthest NodesNot Completed

    Solutions: 136 | View all user solutions | Challenge discussion

    Optimal AssignmentsNot Completed

    Solutions: 477 | View all user solutions | Challenge discussion

    Kaprekars ConstantNot Completed

    Solutions: 91 | View all user solutions | Challenge discussion

    Hamiltonian PathNot Completed

    Solutions: 126 | View all user solutions | Challenge discussion

    Vertex CoveringNot Completed

    Solutions: 130 | View all user solutions | Challenge discussion

    Step WalkingNot Completed

    Solutions: 81 | View all user solutions | Challenge discussion

    Pascals TriangleNot Completed

    Solutions: 79 | View all user solutions | Challenge discussion

    Reverse Polish NotationNot Completed

    Solutions: 195 | View all user solutions | Challenge discussion

    Max Heap CheckerNot Completed

    Solutions: 79 | View all user solutions | Challenge discussion

    Chessboard TravelingNot Completed

    Solutions: 46 | View all user solutions | Challenge discussion

    Matching CouplesNot Completed

    Solutions: 92 | View all user solutions | Challenge discussion

    Approaching FibonacciNot Completed

    Solutions: 111 | View all user solutions | Challenge discussion

    Simple SATNot Completed

    Solutions: 60 | View all user solutions | Challenge discussion

    Array CouplesNot Completed

    Solutions: 88 | View all user solutions | Challenge discussion

    Array RotationNot Completed

    Solutions: 142 | View all user solutions | Challenge discussion

    Bracket CombinationsNot Completed

    Solutions: 93 | View all user solutions | Challenge discussion

    Counting AnagramsNot Completed

    Solutions: 120 | View all user solutions | Challenge discussion

    Maximal SquareNot Completed

    Solutions: 32 | View all user solutions | Challenge discussion

    Maximal RectangleNot Completed

    Solutions: 28 | View all user solutions | Challenge discussion

    Bipartite MatchingNot Completed

    Solutions: 23 | View all user solutions | Challenge discussion

    Pentagonal NumberNot Completed

    Solutions: 30 | View all user solutions | Challenge discussion

    City TrafficNot Completed

    Solutions: 22 | View all user solutions | Challenge discussion

    Convex Hull PointsNot Completed

    Solutions: 17 | View all user solutions | Challenge discussion

    Wildcard CharactersNot Completed

    Solutions: 23 | View all user solutions | Challenge discussion

    Companies

    • Google 33
    • Microsoft 13
    • Facebook 7
    • Amazon 4

    Bootcamps

    • Hack Reactor 78
    • Fullstack Academy 78
    • Grace Hopper 78
    • App Academy 78
    • Codesmith 78

    All Tags

    • searching 97
    • array 68
    • string manipulation 56
    • math fundamentals 53
    • hash table 22
    • optimization 22
    • matrix 20
    • dynamic programming 19
    • regular expression 9
    • combinatorics 9
    • graph 9
    • algebra 9
    • game 9
    • recursion 8
    • sorting 8
    • sequences 7
    • stack 7
    • binary tree 5
    • chess 5
    • encoding 5
    • geometry 4
    • linear algebra 4
    • character codes 3
    • set theory 3
    • heap 3
    • prime numbers 3
    • binary 2
    • bitwise operation 2
    • cache 1