• Challenges
  • Algorithms
  • Easy Difficulty

    First ReverseNot Completed

    Solutions: 50415 | Step-by-step solution | Challenge discussion

    First FactorialNot Completed

    Solutions: 35392 | Step-by-step solution | Challenge discussion

    Longest WordNot Completed

    Solutions: 29973 | Step-by-step solution | Challenge discussion

    Letter ChangesNot Completed

    Solutions: 26558 | Step-by-step solution | Challenge discussion

    Simple AddingNot Completed

    Solutions: 23884 | Step-by-step solution | Challenge discussion

    Letter CapitalizeNot Completed

    Solutions: 20318 | Step-by-step solution | Challenge discussion

    Simple SymbolsNot Completed

    Solutions: 15489 | Step-by-step solution | Challenge discussion

    Check NumsNot Completed

    Solutions: 17794 | Step-by-step solution | Challenge discussion

    Time ConvertNot Completed

    Solutions: 13242 | Step-by-step solution | Challenge discussion

    Alphabet SoupNot Completed

    Solutions: 12621 | Step-by-step solution | Challenge discussion

    AB CheckNot Completed

    Solutions: 12689 | Step-by-step solution | Challenge discussion

    Vowel CountNot Completed

    Solutions: 12469 | Step-by-step solution | Challenge discussion

    Word CountNot Completed

    Solutions: 11887 | Step-by-step solution | Challenge discussion

    Ex OhNot Completed

    Solutions: 11131 | Step-by-step solution | Challenge discussion

    PalindromeNot Completed

    Solutions: 12752 | Step-by-step solution | Challenge discussion

    Arith GeoNot Completed

    Solutions: 9684 | Step-by-step solution | Challenge discussion

    Array Addition INot Completed

    Solutions: 5854 | Step-by-step solution | Challenge discussion

    Letter Count INot Completed

    Solutions: 5286 | Step-by-step solution | Challenge discussion

    Second GreatLowNot Completed

    Solutions: 9254 | Step-by-step solution | Challenge discussion

    Division StringifiedNot Completed

    Solutions: 7044 | Step-by-step solution | Challenge discussion

    Counting Minutes INot Completed

    Solutions: 4147 | Step-by-step solution | Challenge discussion

    Mean ModeNot Completed

    Solutions: 5625 | Step-by-step solution | Challenge discussion

    Dash InsertNot Completed

    Solutions: 6133 | Step-by-step solution | Challenge discussion

    Swap CaseNot Completed

    Solutions: 6212 | Step-by-step solution | Challenge discussion

    Number AdditionNot Completed

    Solutions: 5985 | Step-by-step solution | Challenge discussion

    Third GreatestNot Completed

    Solutions: 5462 | Step-by-step solution | Challenge discussion

    Powers of TwoNot Completed

    Solutions: 6037 | Step-by-step solution | Challenge discussion

    Additive PersistenceNot Completed

    Solutions: 4037 | Step-by-step solution | Challenge discussion

    Multiplicative PersistenceNot Completed

    Solutions: 3231 | Step-by-step solution | Challenge discussion

    Off Line MinimumNot Completed

    Solutions: 4197 | Step-by-step solution | Challenge discussion

    Changing SequenceNot Completed

    Solutions: 884 | Step-by-step solution | Challenge discussion

    Overlapping RangesNot Completed

    Solutions: 850 | Step-by-step solution | Challenge discussion

    SuperincreasingNot Completed

    Solutions: 832 | Step-by-step solution | Challenge discussion

    Hamming DistanceNot Completed

    Solutions: 559 | Step-by-step solution | Challenge discussion

    Rectangle AreaNot Completed

    Solutions: 642 | Step-by-step solution | Challenge discussion

    Bitwise OneNot Completed

    Solutions: 613 | Step-by-step solution | Challenge discussion

    Other ProductsNot Completed

    Solutions: 74 | Step-by-step solution | Challenge discussion

    Wave SortingNot Completed

    Solutions: 50 | Step-by-step solution | Challenge discussion

    Array MatchingNot Completed

    Solutions: 34 | Step-by-step solution | Challenge discussion

    Binary ReversalNot Completed

    Solutions: 30 | Step-by-step solution | Challenge discussion

    Longest Increasing SequenceNot Completed

    Solutions: 33 | Step-by-step solution | Challenge discussion

    Even PairsNot Completed

    Solutions: 8 | Step-by-step solution | Challenge discussion

    Medium Difficulty

    Prime TimeNot Completed

    Solutions: 10022 | Step-by-step solution | Challenge discussion

    Run Length Not Completed

    Solutions: 6864 | Step-by-step solution | Challenge discussion

    Prime MoverNot Completed

    Solutions: 6316 | Step-by-step solution | Challenge discussion

    Palindrome TwoNot Completed

    Solutions: 5783 | Step-by-step solution | Challenge discussion

    DivisionNot Completed

    Solutions: 5176 | Step-by-step solution | Challenge discussion

    String ScrambleNot Completed

    Solutions: 5693 | Step-by-step solution | Challenge discussion

    Arith Geo IINot Completed

    Solutions: 4120 | Step-by-step solution | Challenge discussion

    Array AdditionNot Completed

    Solutions: 3320 | Step-by-step solution | Challenge discussion

    Binary ConverterNot Completed

    Solutions: 3891 | Step-by-step solution | Challenge discussion

    Letter CountNot Completed

    Solutions: 3419 | Step-by-step solution | Challenge discussion

    Simple ModeNot Completed

    Solutions: 3779 | Step-by-step solution | Challenge discussion

    Caesar CipherNot Completed

    Solutions: 4058 | Step-by-step solution | Challenge discussion

    Formatted DivisionNot Completed

    Solutions: 2952 | Step-by-step solution | Challenge discussion

    ConsecutiveNot Completed

    Solutions: 3324 | Step-by-step solution | Challenge discussion

    Counting MinutesNot Completed

    Solutions: 2220 | Step-by-step solution | Challenge discussion

    Permutation StepNot Completed

    Solutions: 2511 | Step-by-step solution | Challenge discussion

    Prime CheckerNot Completed

    Solutions: 1935 | Step-by-step solution | Challenge discussion

    Dash Insert IINot Completed

    Solutions: 4034 | Step-by-step solution | Challenge discussion

    Swap IINot Completed

    Solutions: 2137 | Step-by-step solution | Challenge discussion

    Number SearchNot Completed

    Solutions: 2596 | Step-by-step solution | Challenge discussion

    Triple DoubleNot Completed

    Solutions: 2389 | Step-by-step solution | Challenge discussion

    Bracket MatcherNot Completed

    Solutions: 2236 | Step-by-step solution | Challenge discussion

    String ReductionNot Completed

    Solutions: 1861 | Step-by-step solution | Challenge discussion

    Coin DeterminerNot Completed

    Solutions: 1786 | Step-by-step solution | Challenge discussion

    ThreeFive MultiplesNot Completed

    Solutions: 2270 | Step-by-step solution | Challenge discussion

    Fibonacci CheckerNot Completed

    Solutions: 2143 | Step-by-step solution | Challenge discussion

    Multiple BracketsNot Completed

    Solutions: 1783 | Step-by-step solution | Challenge discussion

    Most Free TimeNot Completed

    Solutions: 1124 | Step-by-step solution | Challenge discussion

    Overlapping RectanglesNot Completed

    Solutions: 1266 | Step-by-step solution | Challenge discussion

    Distinct ListNot Completed

    Solutions: 1965 | Step-by-step solution | Challenge discussion

    Look Say SequenceNot Completed

    Solutions: 1102 | Step-by-step solution | Challenge discussion

    Number EncodingNot Completed

    Solutions: 1155 | Step-by-step solution | Challenge discussion

    Stock PickerNot Completed

    Solutions: 335 | Step-by-step solution | Challenge discussion

    Max SubarrayNot Completed

    Solutions: 204 | Step-by-step solution | Challenge discussion

    Missing DigitNot Completed

    Solutions: 127 | Step-by-step solution | Challenge discussion

    K Unique CharactersNot Completed

    Solutions: 114 | Step-by-step solution | Challenge discussion

    Bitmap HolesNot Completed

    Solutions: 65 | Step-by-step solution | Challenge discussion

    Symmetric TreeNot Completed

    Solutions: 65 | Step-by-step solution | Challenge discussion

    Binary Search Tree LCANot Completed

    Solutions: 52 | Step-by-step solution | Challenge discussion

    Binary Tree LCANot Completed

    Solutions: 30 | Step-by-step solution | Challenge discussion

    LRU CacheNot Completed

    Solutions: 5 | Step-by-step solution | Challenge discussion

    Tree ConstructorNot Completed

    Solutions: 13 | Step-by-step solution | Challenge discussion

    Array Min JumpsNot Completed

    Solutions: 9 | Step-by-step solution | Challenge discussion

    Hard Difficulty

    Shortest PathNot Completed

    Solutions: 820 | Step-by-step solution | Challenge discussion

    Pattern ChaserNot Completed

    Solutions: 544 | Step-by-step solution | Challenge discussion

    CalculatorNot Completed

    Solutions: 952 | Step-by-step solution | Challenge discussion

    Weighted PathNot Completed

    Solutions: 293 | Step-by-step solution | Challenge discussion

    Intersecting LinesNot Completed

    Solutions: 471 | Step-by-step solution | Challenge discussion

    RREF MatrixNot Completed

    Solutions: 102 | Step-by-step solution | Challenge discussion

    Polynomial ExpansionNot Completed

    Solutions: 255 | Step-by-step solution | Challenge discussion

    Gas StationNot Completed

    Solutions: 472 | Step-by-step solution | Challenge discussion

    Symmetric MatrixNot Completed

    Solutions: 334 | Step-by-step solution | Challenge discussion

    Switch SortNot Completed

    Solutions: 239 | Step-by-step solution | Challenge discussion

    Matrix DeterminantNot Completed

    Solutions: 231 | Step-by-step solution | Challenge discussion

    Queen CheckNot Completed

    Solutions: 390 | Step-by-step solution | Challenge discussion

    Noughts DeterminerNot Completed

    Solutions: 336 | Step-by-step solution | Challenge discussion

    Blackjack HighestNot Completed

    Solutions: 438 | Step-by-step solution | Challenge discussion

    Transitivity RelationsNot Completed

    Solutions: 393 | Step-by-step solution | Challenge discussion

    Alphabet Run EncryptionNot Completed

    Solutions: 220 | Step-by-step solution | Challenge discussion

    Knight JumpsNot Completed

    Solutions: 466 | Step-by-step solution | Challenge discussion

    Line OrderingNot Completed

    Solutions: 43 | Step-by-step solution | Challenge discussion

    Sudoku Quadrant CheckerNot Completed

    Solutions: 84 | Step-by-step solution | Challenge discussion

    Quick KnightNot Completed

    Solutions: 36 | Step-by-step solution | Challenge discussion

    Square FiguresNot Completed

    Solutions: 82 | Step-by-step solution | Challenge discussion

    Connect Four WinnerNot Completed

    Solutions: 59 | Step-by-step solution | Challenge discussion

    Array JumpingNot Completed

    Solutions: 44 | Step-by-step solution | Challenge discussion

    Matrix BorderNot Completed

    Solutions: 48 | Step-by-step solution | Challenge discussion

    Roman Numeral ReductionNot Completed

    Solutions: 52 | Step-by-step solution | Challenge discussion

    Parallel SumsNot Completed

    Solutions: 64 | Step-by-step solution | Challenge discussion

    LCSNot Completed

    Solutions: 42 | Step-by-step solution | Challenge discussion

    Nim WinnerNot Completed

    Solutions: 33 | Step-by-step solution | Challenge discussion

    Farthest NodesNot Completed

    Solutions: 128 | Step-by-step solution | Challenge discussion

    Optimal AssignmentsNot Completed

    Solutions: 470 | Step-by-step solution | Challenge discussion

    Kaprekars ConstantNot Completed

    Solutions: 69 | Step-by-step solution | Challenge discussion

    Hamiltonian PathNot Completed

    Solutions: 117 | Step-by-step solution | Challenge discussion

    Vertex CoveringNot Completed

    Solutions: 122 | Step-by-step solution | Challenge discussion

    Step WalkingNot Completed

    Solutions: 57 | Step-by-step solution | Challenge discussion

    Pascals TriangleNot Completed

    Solutions: 58 | Step-by-step solution | Challenge discussion

    Reverse Polish NotationNot Completed

    Solutions: 175 | Step-by-step solution | Challenge discussion

    Max Heap CheckerNot Completed

    Solutions: 58 | Step-by-step solution | Challenge discussion

    Chessboard TravelingNot Completed

    Solutions: 38 | Step-by-step solution | Challenge discussion

    Matching CouplesNot Completed

    Solutions: 69 | Step-by-step solution | Challenge discussion

    Approaching FibonacciNot Completed

    Solutions: 72 | Step-by-step solution | Challenge discussion

    Simple SATNot Completed

    Solutions: 38 | Step-by-step solution | Challenge discussion

    Array CouplesNot Completed

    Solutions: 53 | Step-by-step solution | Challenge discussion

    Array RotationNot Completed

    Solutions: 72 | Step-by-step solution | Challenge discussion

    Bracket CombinationsNot Completed

    Solutions: 57 | Step-by-step solution | Challenge discussion

    Counting AnagramsNot Completed

    Solutions: 66 | Step-by-step solution | Challenge discussion

    Maximal SquareNot Completed

    Solutions: 15 | Step-by-step solution | Challenge discussion

    Maximal RectangleNot Completed

    Solutions: 16 | Step-by-step solution | Challenge discussion