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    Array AdditionNot Completed

    Solutions: 4125 | Step-by-step solution | Challenge discussion

    Permutation StepNot Completed

    Solutions: 3138 | Step-by-step solution | Challenge discussion

    Intersecting LinesNot Completed

    Solutions: 542 | Step-by-step solution | Challenge discussion

    Look Say SequenceNot Completed

    Solutions: 1372 | Step-by-step solution | Challenge discussion

    Roman Numeral ReductionNot Completed

    Solutions: 71 | Step-by-step solution | Challenge discussion

    LCSNot Completed

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

    Pascals TriangleNot Completed

    Solutions: 87 | Step-by-step solution | Challenge discussion

    Hamming DistanceNot Completed

    Solutions: 1501 | Step-by-step solution | Challenge discussion

    K Unique CharactersNot Completed

    Solutions: 363 | Step-by-step solution | Challenge discussion

    Maximal RectangleNot Completed

    Solutions: 32 | Step-by-step solution | Challenge discussion

    Symmetric TreeNot Completed

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

    Tree ConstructorNot Completed

    Solutions: 131 | Step-by-step solution | Challenge discussion

    Two SumNot Completed

    Solutions: 1447 | Step-by-step solution | Challenge discussion

    Power Set CountNot Completed

    Solutions: 857 | Step-by-step solution | Challenge discussion

    Food DistributionNot Completed

    Solutions: 489 | Step-by-step solution | Challenge discussion

    Min Window SubstringNot Completed

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

    Three SumNot Completed

    Solutions: 580 | Step-by-step solution | Challenge discussion

    Histogram AreaNot Completed

    Solutions: 80 | Step-by-step solution | Challenge discussion

    Scale BalancingNot Completed

    Solutions: 841 | Step-by-step solution | Challenge discussion

    Longest ConsecutiveNot Completed

    Solutions: 216 | Step-by-step solution | Challenge discussion

    String MergeNot Completed

    Solutions: 327 | Step-by-step solution | Challenge discussion

    Plus MinusNot Completed

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

    Remove BracketsNot Completed

    Solutions: 275 | Step-by-step solution | Challenge discussion

    Easy Difficulty

    First ReverseNot Completed

    Solutions: 89172 | Step-by-step solution | Challenge discussion

    First FactorialNot Completed

    Solutions: 63857 | Step-by-step solution | Challenge discussion

    Longest WordNot Completed

    Solutions: 48899 | Step-by-step solution | Challenge discussion

    Letter ChangesNot Completed

    Solutions: 50801 | Step-by-step solution | Challenge discussion

    Simple AddingNot Completed

    Solutions: 41862 | Step-by-step solution | Challenge discussion

    Letter CapitalizeNot Completed

    Solutions: 35592 | Step-by-step solution | Challenge discussion

    Simple SymbolsNot Completed

    Solutions: 29132 | Step-by-step solution | Challenge discussion

    Check NumsNot Completed

    Solutions: 30257 | Step-by-step solution | Challenge discussion

    Time ConvertNot Completed

    Solutions: 22877 | Step-by-step solution | Challenge discussion

    Alphabet SoupNot Completed

    Solutions: 21385 | Step-by-step solution | Challenge discussion

    AB CheckNot Completed

    Solutions: 16019 | Step-by-step solution | Challenge discussion

    Vowel CountNot Completed

    Solutions: 14916 | Step-by-step solution | Challenge discussion

    Word CountNot Completed

    Solutions: 14080 | Step-by-step solution | Challenge discussion

    Ex OhNot Completed

    Solutions: 13692 | Step-by-step solution | Challenge discussion

    PalindromeNot Completed

    Solutions: 15917 | Step-by-step solution | Challenge discussion

    Arith GeoNot Completed

    Solutions: 12629 | Step-by-step solution | Challenge discussion

    Array Addition INot Completed

    Solutions: 7965 | Step-by-step solution | Challenge discussion

    Letter Count INot Completed

    Solutions: 7321 | Step-by-step solution | Challenge discussion

    Second GreatLowNot Completed

    Solutions: 12218 | Step-by-step solution | Challenge discussion

    Division StringifiedNot Completed

    Solutions: 9148 | Step-by-step solution | Challenge discussion

    Counting Minutes INot Completed

    Solutions: 5424 | Step-by-step solution | Challenge discussion

    Mean ModeNot Completed

    Solutions: 7186 | Step-by-step solution | Challenge discussion

    Dash InsertNot Completed

    Solutions: 8112 | Step-by-step solution | Challenge discussion

    Swap CaseNot Completed

    Solutions: 7760 | Step-by-step solution | Challenge discussion

    Number AdditionNot Completed

    Solutions: 7549 | Step-by-step solution | Challenge discussion

    Third GreatestNot Completed

    Solutions: 6987 | Step-by-step solution | Challenge discussion

    Powers of TwoNot Completed

    Solutions: 7867 | Step-by-step solution | Challenge discussion

    Additive PersistenceNot Completed

    Solutions: 5520 | Step-by-step solution | Challenge discussion

    Multiplicative PersistenceNot Completed

    Solutions: 4272 | Step-by-step solution | Challenge discussion

    Off Line MinimumNot Completed

    Solutions: 5722 | Step-by-step solution | Challenge discussion

    Changing SequenceNot Completed

    Solutions: 2194 | Step-by-step solution | Challenge discussion

    Overlapping RangesNot Completed

    Solutions: 2217 | Step-by-step solution | Challenge discussion

    SuperincreasingNot Completed

    Solutions: 2224 | Step-by-step solution | Challenge discussion

    Hamming DistanceNot Completed

    Solutions: 1501 | Step-by-step solution | Challenge discussion

    Rectangle AreaNot Completed

    Solutions: 1826 | Step-by-step solution | Challenge discussion

    Bitwise OneNot Completed

    Solutions: 1482 | Step-by-step solution | Challenge discussion

    Other ProductsNot Completed

    Solutions: 1494 | Step-by-step solution | Challenge discussion

    Wave SortingNot Completed

    Solutions: 984 | Step-by-step solution | Challenge discussion

    Array MatchingNot Completed

    Solutions: 1173 | Step-by-step solution | Challenge discussion

    Binary ReversalNot Completed

    Solutions: 976 | Step-by-step solution | Challenge discussion

    Longest Increasing SequenceNot Completed

    Solutions: 970 | Step-by-step solution | Challenge discussion

    Even PairsNot Completed

    Solutions: 894 | Step-by-step solution | Challenge discussion

    Next PalindromeNot Completed

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

    Largest PairNot Completed

    Solutions: 1140 | Step-by-step solution | Challenge discussion

    Nonrepeating CharacterNot Completed

    Solutions: 797 | Step-by-step solution | Challenge discussion

    Two SumNot Completed

    Solutions: 1447 | Step-by-step solution | Challenge discussion

    Bitwise TwoNot Completed

    Solutions: 566 | Step-by-step solution | Challenge discussion

    Power Set CountNot Completed

    Solutions: 857 | Step-by-step solution | Challenge discussion

    Product DigitsNot Completed

    Solutions: 1113 | Step-by-step solution | Challenge discussion

    Palindrome CreatorNot Completed

    Solutions: 875 | Step-by-step solution | Challenge discussion

    Basic Roman NumeralsNot Completed

    Solutions: 594 | Step-by-step solution | Challenge discussion

    Food DistributionNot Completed

    Solutions: 489 | Step-by-step solution | Challenge discussion

    Three SumNot Completed

    Solutions: 580 | Step-by-step solution | Challenge discussion

    Correct PathNot Completed

    Solutions: 673 | Step-by-step solution | Challenge discussion

    Scale BalancingNot Completed

    Solutions: 841 | Step-by-step solution | Challenge discussion

    Three NumbersNot Completed

    Solutions: 535 | Step-by-step solution | Challenge discussion

    Alphabet SearchingNot Completed

    Solutions: 467 | Step-by-step solution | Challenge discussion

    Time DifferenceNot Completed

    Solutions: 282 | Step-by-step solution | Challenge discussion

    Triangle RowNot Completed

    Solutions: 274 | Step-by-step solution | Challenge discussion

    Vowel SquareNot Completed

    Solutions: 564 | Step-by-step solution | Challenge discussion

    Closest EnemyNot Completed

    Solutions: 412 | Step-by-step solution | Challenge discussion

    Closest Enemy IINot Completed

    Solutions: 409 | Step-by-step solution | Challenge discussion

    Number StreamNot Completed

    Solutions: 234 | Step-by-step solution | Challenge discussion

    Largest FourNot Completed

    Solutions: 415 | Step-by-step solution | Challenge discussion

    Distinct CharactersNot Completed

    Solutions: 285 | Step-by-step solution | Challenge discussion

    Questions MarksNot Completed

    Solutions: 947 | Step-by-step solution | Challenge discussion

    Camel CaseNot Completed

    Solutions: 328 | Step-by-step solution | Challenge discussion

    ASCII ConversionNot Completed

    Solutions: 219 | Step-by-step solution | Challenge discussion

    Simple EvensNot Completed

    Solutions: 312 | Step-by-step solution | Challenge discussion

    Snake CaseNot Completed

    Solutions: 275 | Step-by-step solution | Challenge discussion

    Sum MultiplierNot Completed

    Solutions: 351 | Step-by-step solution | Challenge discussion

    String MergeNot Completed

    Solutions: 327 | Step-by-step solution | Challenge discussion

    One DecrementedNot Completed

    Solutions: 308 | Step-by-step solution | Challenge discussion

    Element MergerNot Completed

    Solutions: 324 | Step-by-step solution | Challenge discussion

    GCFNot Completed

    Solutions: 302 | Step-by-step solution | Challenge discussion

    Serial NumberNot Completed

    Solutions: 314 | Step-by-step solution | Challenge discussion

    String PeriodsNot Completed

    Solutions: 275 | Step-by-step solution | Challenge discussion

    Palindrome SwapperNot Completed

    Solutions: 186 | Step-by-step solution | Challenge discussion

    Remove BracketsNot Completed

    Solutions: 275 | Step-by-step solution | Challenge discussion

    Command LineNot Completed

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

    Star RatingNot Completed

    Solutions: 161 | Step-by-step solution | Challenge discussion

    Moving MedianNot Completed

    Solutions: 29 | Step-by-step solution | Challenge discussion

    Medium Difficulty

    Prime TimeNot Completed

    Solutions: 11614 | Step-by-step solution | Challenge discussion

    Run Length Not Completed

    Solutions: 8156 | Step-by-step solution | Challenge discussion

    Prime MoverNot Completed

    Solutions: 7168 | Step-by-step solution | Challenge discussion

    Palindrome TwoNot Completed

    Solutions: 6804 | Step-by-step solution | Challenge discussion

    DivisionNot Completed

    Solutions: 6377 | Step-by-step solution | Challenge discussion

    String ScrambleNot Completed

    Solutions: 6910 | Step-by-step solution | Challenge discussion

    Arith Geo IINot Completed

    Solutions: 4792 | Step-by-step solution | Challenge discussion

    Array AdditionNot Completed

    Solutions: 4125 | Step-by-step solution | Challenge discussion

    Binary ConverterNot Completed

    Solutions: 4354 | Step-by-step solution | Challenge discussion

    Letter CountNot Completed

    Solutions: 4250 | Step-by-step solution | Challenge discussion

    Simple ModeNot Completed

    Solutions: 4797 | Step-by-step solution | Challenge discussion

    Caesar CipherNot Completed

    Solutions: 4863 | Step-by-step solution | Challenge discussion

    Formatted DivisionNot Completed

    Solutions: 3611 | Step-by-step solution | Challenge discussion

    ConsecutiveNot Completed

    Solutions: 3923 | Step-by-step solution | Challenge discussion

    Counting MinutesNot Completed

    Solutions: 2636 | View all user solutions | Challenge discussion

    Permutation StepNot Completed

    Solutions: 3138 | View all user solutions | Challenge discussion

    Prime CheckerNot Completed

    Solutions: 2417 | View all user solutions | Challenge discussion

    Dash Insert IINot Completed

    Solutions: 4718 | View all user solutions | Challenge discussion

    Swap IINot Completed

    Solutions: 2603 | View all user solutions | Challenge discussion

    Number SearchNot Completed

    Solutions: 3198 | View all user solutions | Challenge discussion

    Triple DoubleNot Completed

    Solutions: 2965 | View all user solutions | Challenge discussion

    Bracket MatcherNot Completed

    Solutions: 2713 | View all user solutions | Challenge discussion

    String ReductionNot Completed

    Solutions: 2238 | View all user solutions | Challenge discussion

    Coin DeterminerNot Completed

    Solutions: 2199 | View all user solutions | Challenge discussion

    ThreeFive MultiplesNot Completed

    Solutions: 2714 | View all user solutions | Challenge discussion

    Fibonacci CheckerNot Completed

    Solutions: 2539 | View all user solutions | Challenge discussion

    Multiple BracketsNot Completed

    Solutions: 2227 | View all user solutions | Challenge discussion

    Most Free TimeNot Completed

    Solutions: 1342 | View all user solutions | Challenge discussion

    Overlapping RectanglesNot Completed

    Solutions: 1515 | View all user solutions | Challenge discussion

    Distinct ListNot Completed

    Solutions: 2297 | View all user solutions | Challenge discussion

    Look Say SequenceNot Completed

    Solutions: 1372 | View all user solutions | Challenge discussion

    Number EncodingNot Completed

    Solutions: 1412 | View all user solutions | Challenge discussion

    Stock PickerNot Completed

    Solutions: 642 | View all user solutions | Challenge discussion

    Max SubarrayNot Completed

    Solutions: 555 | View all user solutions | Challenge discussion

    Missing DigitNot Completed

    Solutions: 378 | View all user solutions | Challenge discussion

    K Unique CharactersNot Completed

    Solutions: 363 | View all user solutions | Challenge discussion

    Bitmap HolesNot Completed

    Solutions: 258 | View all user solutions | Challenge discussion

    Symmetric TreeNot Completed

    Solutions: 230 | View all user solutions | Challenge discussion

    Binary Search Tree LCANot Completed

    Solutions: 200 | View all user solutions | Challenge discussion

    Binary Tree LCANot Completed

    Solutions: 112 | View all user solutions | Challenge discussion

    LRU CacheNot Completed

    Solutions: 145 | View all user solutions | Challenge discussion

    Tree ConstructorNot Completed

    Solutions: 131 | View all user solutions | Challenge discussion

    Array Min JumpsNot Completed

    Solutions: 175 | View all user solutions | Challenge discussion

    Nearest Smaller ValuesNot Completed

    Solutions: 335 | View all user solutions | Challenge discussion

    Matrix SpiralNot Completed

    Solutions: 146 | View all user solutions | Challenge discussion

    Word SplitNot Completed

    Solutions: 289 | View all user solutions | Challenge discussion

    Pair SearchingNot Completed

    Solutions: 86 | View all user solutions | Challenge discussion

    Boggle SolverNot Completed

    Solutions: 64 | View all user solutions | Challenge discussion

    HTML ElementsNot Completed

    Solutions: 114 | View all user solutions | Challenge discussion

    Missing Digit IINot Completed

    Solutions: 120 | View all user solutions | Challenge discussion

    Palindromic SubstringNot Completed

    Solutions: 193 | View all user solutions | Challenge discussion

    Trapping WaterNot Completed

    Solutions: 112 | View all user solutions | Challenge discussion

    Matrix PathNot Completed

    Solutions: 61 | View all user solutions | Challenge discussion

    Seating StudentsNot Completed

    Solutions: 115 | View all user solutions | Challenge discussion

    Longest Matrix PathNot Completed

    Solutions: 45 | View all user solutions | Challenge discussion

    Min Window SubstringNot Completed

    Solutions: 114 | View all user solutions | Challenge discussion

    Matrix ChainsNot Completed

    Solutions: 52 | View all user solutions | Challenge discussion

    Histogram AreaNot Completed

    Solutions: 80 | View all user solutions | Challenge discussion

    Matching CharactersNot Completed

    Solutions: 125 | View all user solutions | Challenge discussion

    Ternary ConverterNot Completed

    Solutions: 66 | View all user solutions | Challenge discussion

    Linear CongruenceNot Completed

    Solutions: 37 | View all user solutions | Challenge discussion

    Formatted NumberNot Completed

    Solutions: 141 | View all user solutions | Challenge discussion

    Largest Row ColumnNot Completed

    Solutions: 33 | View all user solutions | Challenge discussion

    Eight QueensNot Completed

    Solutions: 115 | View all user solutions | Challenge discussion

    Three PointsNot Completed

    Solutions: 83 | View all user solutions | Challenge discussion

    Character RemovalNot Completed

    Solutions: 110 | View all user solutions | Challenge discussion

    Simple PasswordNot Completed

    Solutions: 144 | View all user solutions | Challenge discussion

    Preorder TraversalNot Completed

    Solutions: 55 | View all user solutions | Challenge discussion

    String ZigzagNot Completed

    Solutions: 75 | View all user solutions | Challenge discussion

    Off BinaryNot Completed

    Solutions: 60 | View all user solutions | Challenge discussion

    Longest ConsecutiveNot Completed

    Solutions: 216 | View all user solutions | Challenge discussion

    String ExpressionNot Completed

    Solutions: 105 | View all user solutions | Challenge discussion

    Charlie the DogNot Completed

    Solutions: 35 | View all user solutions | Challenge discussion

    Plus MinusNot Completed

    Solutions: 66 | View all user solutions | Challenge discussion

    Hard Difficulty

    Shortest PathNot Completed

    Solutions: 1058 | View all user solutions | Challenge discussion

    Pattern ChaserNot Completed

    Solutions: 705 | View all user solutions | Challenge discussion

    CalculatorNot Completed

    Solutions: 1115 | View all user solutions | Challenge discussion

    Weighted PathNot Completed

    Solutions: 338 | View all user solutions | Challenge discussion

    Intersecting LinesNot Completed

    Solutions: 542 | View all user solutions | Challenge discussion

    RREF MatrixNot Completed

    Solutions: 120 | View all user solutions | Challenge discussion

    Polynomial ExpansionNot Completed

    Solutions: 276 | View all user solutions | Challenge discussion

    Gas StationNot Completed

    Solutions: 550 | View all user solutions | Challenge discussion

    Symmetric MatrixNot Completed

    Solutions: 380 | View all user solutions | Challenge discussion

    Switch SortNot Completed

    Solutions: 268 | View all user solutions | Challenge discussion

    Matrix DeterminantNot Completed

    Solutions: 249 | View all user solutions | Challenge discussion

    Queen CheckNot Completed

    Solutions: 443 | View all user solutions | Challenge discussion

    Noughts DeterminerNot Completed

    Solutions: 368 | View all user solutions | Challenge discussion

    Blackjack HighestNot Completed

    Solutions: 510 | View all user solutions | Challenge discussion

    Transitivity RelationsNot Completed

    Solutions: 405 | View all user solutions | Challenge discussion

    Alphabet Run EncryptionNot Completed

    Solutions: 236 | View all user solutions | Challenge discussion

    Knight JumpsNot Completed

    Solutions: 508 | View all user solutions | Challenge discussion

    Line OrderingNot Completed

    Solutions: 54 | View all user solutions | Challenge discussion

    Sudoku Quadrant CheckerNot Completed

    Solutions: 98 | View all user solutions | Challenge discussion

    Quick KnightNot Completed

    Solutions: 44 | View all user solutions | Challenge discussion

    Square FiguresNot Completed

    Solutions: 133 | View all user solutions | Challenge discussion

    Connect Four WinnerNot Completed

    Solutions: 80 | View all user solutions | Challenge discussion

    Array JumpingNot Completed

    Solutions: 64 | View all user solutions | Challenge discussion

    Matrix BorderNot Completed

    Solutions: 57 | View all user solutions | Challenge discussion

    Roman Numeral ReductionNot Completed

    Solutions: 71 | View all user solutions | Challenge discussion

    Parallel SumsNot Completed

    Solutions: 117 | View all user solutions | Challenge discussion

    LCSNot Completed

    Solutions: 65 | View all user solutions | Challenge discussion

    Nim WinnerNot Completed

    Solutions: 45 | View all user solutions | Challenge discussion

    Farthest NodesNot Completed

    Solutions: 139 | View all user solutions | Challenge discussion

    Optimal AssignmentsNot Completed

    Solutions: 488 | View all user solutions | Challenge discussion

    Kaprekars ConstantNot Completed

    Solutions: 454 | View all user solutions | Challenge discussion

    Hamiltonian PathNot Completed

    Solutions: 131 | View all user solutions | Challenge discussion

    Vertex CoveringNot Completed

    Solutions: 132 | View all user solutions | Challenge discussion

    Step WalkingNot Completed

    Solutions: 92 | View all user solutions | Challenge discussion

    Pascals TriangleNot Completed

    Solutions: 87 | View all user solutions | Challenge discussion

    Reverse Polish NotationNot Completed

    Solutions: 205 | View all user solutions | Challenge discussion

    Max Heap CheckerNot Completed

    Solutions: 91 | View all user solutions | Challenge discussion

    Chessboard TravelingNot Completed

    Solutions: 170 | View all user solutions | Challenge discussion

    Matching CouplesNot Completed

    Solutions: 102 | View all user solutions | Challenge discussion

    Approaching FibonacciNot Completed

    Solutions: 119 | View all user solutions | Challenge discussion

    Simple SATNot Completed

    Solutions: 63 | View all user solutions | Challenge discussion

    Array CouplesNot Completed

    Solutions: 96 | View all user solutions | Challenge discussion

    Array RotationNot Completed

    Solutions: 157 | View all user solutions | Challenge discussion

    Bracket CombinationsNot Completed

    Solutions: 107 | View all user solutions | Challenge discussion

    Counting AnagramsNot Completed

    Solutions: 139 | View all user solutions | Challenge discussion

    Maximal SquareNot Completed

    Solutions: 118 | View all user solutions | Challenge discussion

    Maximal RectangleNot Completed

    Solutions: 32 | View all user solutions | Challenge discussion

    Bipartite MatchingNot Completed

    Solutions: 30 | View all user solutions | Challenge discussion

    Pentagonal NumberNot Completed

    Solutions: 134 | View all user solutions | Challenge discussion

    City TrafficNot Completed

    Solutions: 28 | View all user solutions | Challenge discussion

    Convex Hull PointsNot Completed

    Solutions: 24 | View all user solutions | Challenge discussion

    Wildcard CharactersNot Completed

    Solutions: 45 | View all user solutions | Challenge discussion

    Tetris MoveNot Completed

    Solutions: 13 | View all user solutions | Challenge discussion

    Companies

    • Google 43
    • Facebook 23
    • Microsoft 20
    • Amazon 12

    Bootcamps

    • Hack Reactor 82
    • Fullstack Academy 82
    • Grace Hopper 82
    • App Academy 82
    • Codesmith 82

    All Tags

    • searching 100
    • array 70
    • string manipulation 59
    • math fundamentals 54
    • hash table 23
    • optimization 22
    • matrix 21
    • dynamic programming 20
    • recursion 13
    • regular expression 10
    • game 10
    • graph 9
    • algebra 9
    • combinatorics 9
    • sorting 8
    • sequences 7
    • stack 7
    • encoding 6
    • chess 5
    • binary tree 5
    • geometry 4
    • linear algebra 4
    • prime numbers 3
    • set theory 3
    • heap 3
    • bitwise operation 2
    • cache 1