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    Group TotalsNot Completed

    Solutions: 109 | View user solutions | Added 04/30/18

    Moving MedianNot Completed

    Solutions: 157 | View user solutions | Added 11/30/17

    Star RatingNot Completed

    Solutions: 383 | View user solutions | Added 10/30/17

    Free Challenges

    Longest WordNot Completed

    Solutions: 69417 | Step-by-step solution | Challenge discussion

    First FactorialNot Completed

    Solutions: 87604 | Step-by-step solution | Challenge discussion

    First ReverseNot Completed

    Solutions: 109909 | Step-by-step solution | Challenge discussion

    Letter ChangesNot Completed

    Solutions: 66907 | Step-by-step solution | Challenge discussion

    Simple AddingNot Completed

    Solutions: 54702 | Step-by-step solution | Challenge discussion

    Letter CapitalizeNot Completed

    Solutions: 46561 | Step-by-step solution | Challenge discussion

    Simple SymbolsNot Completed

    Solutions: 39608 | Step-by-step solution | Challenge discussion

    Check NumsNot Completed

    Solutions: 40120 | Step-by-step solution | Challenge discussion

    Time ConvertNot Completed

    Solutions: 30465 | Step-by-step solution | Challenge discussion

    Alphabet SoupNot Completed

    Solutions: 28156 | Step-by-step solution | Challenge discussion

    Kaprekars ConstantNot Completed

    Solutions: 3799 | View all user solutions | Challenge discussion

    Chessboard TravelingNot Completed

    Solutions: 1583 | View all user solutions | Challenge discussion

    Maximal SquareNot Completed

    Solutions: 1010 | View all user solutions | Challenge discussion

    Pentagonal NumberNot Completed

    Solutions: 1111 | View all user solutions | Challenge discussion

    Correct PathNot Completed

    Solutions: 1358 | View all user solutions | Challenge discussion

    Scale BalancingNot Completed

    Solutions: 1815 | View all user solutions | Challenge discussion

    Vowel SquareNot Completed

    Solutions: 1188 | View all user solutions | Challenge discussion

    Eight QueensNot Completed

    Solutions: 817 | View all user solutions | Challenge discussion

    Closest Enemy IINot Completed

    Solutions: 1024 | View all user solutions | Challenge discussion

    Questions MarksNot Completed

    Solutions: 2968 | View all user solutions | Challenge discussion

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    Easy Difficulty

    First ReverseNot Completed

    Solutions: 109909 | Step-by-step solution | Challenge discussion

    First FactorialNot Completed

    Solutions: 87604 | Step-by-step solution | Challenge discussion

    Longest WordNot Completed

    Solutions: 69417 | Step-by-step solution | Challenge discussion

    Letter ChangesNot Completed

    Solutions: 66907 | Step-by-step solution | Challenge discussion

    Simple AddingNot Completed

    Solutions: 54702 | Step-by-step solution | Challenge discussion

    Letter CapitalizeNot Completed

    Solutions: 46561 | Step-by-step solution | Challenge discussion

    Simple SymbolsNot Completed

    Solutions: 39608 | Step-by-step solution | Challenge discussion

    Check NumsNot Completed

    Solutions: 40120 | Step-by-step solution | Challenge discussion

    Time ConvertNot Completed

    Solutions: 30465 | Step-by-step solution | Challenge discussion

    Alphabet SoupNot Completed

    Solutions: 28156 | Step-by-step solution | Challenge discussion

    AB CheckNot Completed

    Solutions: 16805 | Step-by-step solution | Challenge discussion

    Vowel CountNot Completed

    Solutions: 15472 | Step-by-step solution | Challenge discussion

    Word CountNot Completed

    Solutions: 14616 | Step-by-step solution | Challenge discussion

    Ex OhNot Completed

    Solutions: 14290 | Step-by-step solution | Challenge discussion

    PalindromeNot Completed

    Solutions: 16651 | Step-by-step solution | Challenge discussion

    Arith GeoNot Completed

    Solutions: 13272 | Step-by-step solution | Challenge discussion

    Array Addition INot Completed

    Solutions: 8482 | Step-by-step solution | Challenge discussion

    Letter Count INot Completed

    Solutions: 7786 | Step-by-step solution | Challenge discussion

    Second GreatLowNot Completed

    Solutions: 12915 | Step-by-step solution | Challenge discussion

    Division StringifiedNot Completed

    Solutions: 9693 | Step-by-step solution | Challenge discussion

    Counting Minutes INot Completed

    Solutions: 5732 | Step-by-step solution | Challenge discussion

    Mean ModeNot Completed

    Solutions: 7533 | Step-by-step solution | Challenge discussion

    Dash InsertNot Completed

    Solutions: 8530 | Step-by-step solution | Challenge discussion

    Swap CaseNot Completed

    Solutions: 8087 | Step-by-step solution | Challenge discussion

    Number AdditionNot Completed

    Solutions: 7946 | Step-by-step solution | Challenge discussion

    Third GreatestNot Completed

    Solutions: 7348 | Step-by-step solution | Challenge discussion

    Powers of TwoNot Completed

    Solutions: 8231 | Step-by-step solution | Challenge discussion

    Additive PersistenceNot Completed

    Solutions: 5861 | Step-by-step solution | Challenge discussion

    Multiplicative PersistenceNot Completed

    Solutions: 4523 | Step-by-step solution | Challenge discussion

    Off Line MinimumNot Completed

    Solutions: 6074 | Step-by-step solution | Challenge discussion

    Changing SequenceNot Completed

    Solutions: 2497 | Step-by-step solution | Challenge discussion

    Overlapping RangesNot Completed

    Solutions: 2497 | Step-by-step solution | Challenge discussion

    SuperincreasingNot Completed

    Solutions: 2538 | Step-by-step solution | Challenge discussion

    Hamming DistanceNot Completed

    Solutions: 1732 | Step-by-step solution | Challenge discussion

    Rectangle AreaNot Completed

    Solutions: 2112 | Step-by-step solution | Challenge discussion

    Bitwise OneNot Completed

    Solutions: 1717 | Step-by-step solution | Challenge discussion

    Other ProductsNot Completed

    Solutions: 1751 | Step-by-step solution | Challenge discussion

    Wave SortingNot Completed

    Solutions: 1218 | Step-by-step solution | Challenge discussion

    Array MatchingNot Completed

    Solutions: 1497 | Step-by-step solution | Challenge discussion

    Binary ReversalNot Completed

    Solutions: 1239 | Step-by-step solution | Challenge discussion

    Longest Increasing SequenceNot Completed

    Solutions: 1189 | Step-by-step solution | Challenge discussion

    Even PairsNot Completed

    Solutions: 1137 | Step-by-step solution | Challenge discussion

    Next PalindromeNot Completed

    Solutions: 990 | Step-by-step solution | Challenge discussion

    Largest PairNot Completed

    Solutions: 1323 | Step-by-step solution | Challenge discussion

    Nonrepeating CharacterNot Completed

    Solutions: 978 | Step-by-step solution | Challenge discussion

    Two SumNot Completed

    Solutions: 1790 | Step-by-step solution | Challenge discussion

    Bitwise TwoNot Completed

    Solutions: 708 | Step-by-step solution | Challenge discussion

    Power Set CountNot Completed

    Solutions: 1038 | Step-by-step solution | Challenge discussion

    Product DigitsNot Completed

    Solutions: 1308 | Step-by-step solution | Challenge discussion

    Palindrome CreatorNot Completed

    Solutions: 1077 | Step-by-step solution | Challenge discussion

    Basic Roman NumeralsNot Completed

    Solutions: 718 | Step-by-step solution | Challenge discussion

    Food DistributionNot Completed

    Solutions: 615 | Step-by-step solution | Challenge discussion

    Three SumNot Completed

    Solutions: 724 | Step-by-step solution | Challenge discussion

    Correct PathNot Completed

    Solutions: 1358 | Step-by-step solution | Challenge discussion

    Scale BalancingNot Completed

    Solutions: 1815 | Step-by-step solution | Challenge discussion

    Three NumbersNot Completed

    Solutions: 684 | Step-by-step solution | Challenge discussion

    Alphabet SearchingNot Completed

    Solutions: 584 | Step-by-step solution | Challenge discussion

    Time DifferenceNot Completed

    Solutions: 378 | Step-by-step solution | Challenge discussion

    Triangle RowNot Completed

    Solutions: 368 | Step-by-step solution | Challenge discussion

    Vowel SquareNot Completed

    Solutions: 1188 | Step-by-step solution | Challenge discussion

    Closest EnemyNot Completed

    Solutions: 543 | Step-by-step solution | Challenge discussion

    Closest Enemy IINot Completed

    Solutions: 1024 | Step-by-step solution | Challenge discussion

    Number StreamNot Completed

    Solutions: 366 | Step-by-step solution | Challenge discussion

    Largest FourNot Completed

    Solutions: 543 | Step-by-step solution | Challenge discussion

    Distinct CharactersNot Completed

    Solutions: 388 | Step-by-step solution | Challenge discussion

    Questions MarksNot Completed

    Solutions: 2968 | Step-by-step solution | Challenge discussion

    Camel CaseNot Completed

    Solutions: 455 | Step-by-step solution | Challenge discussion

    ASCII ConversionNot Completed

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

    Simple EvensNot Completed

    Solutions: 427 | Step-by-step solution | Challenge discussion

    Snake CaseNot Completed

    Solutions: 373 | Step-by-step solution | Challenge discussion

    Sum MultiplierNot Completed

    Solutions: 469 | Step-by-step solution | Challenge discussion

    String MergeNot Completed

    Solutions: 440 | Step-by-step solution | Challenge discussion

    One DecrementedNot Completed

    Solutions: 414 | Step-by-step solution | Challenge discussion

    Element MergerNot Completed

    Solutions: 444 | Step-by-step solution | Challenge discussion

    GCFNot Completed

    Solutions: 410 | Step-by-step solution | Challenge discussion

    Serial NumberNot Completed

    Solutions: 567 | Step-by-step solution | Challenge discussion

    String PeriodsNot Completed

    Solutions: 488 | Step-by-step solution | Challenge discussion

    Palindrome SwapperNot Completed

    Solutions: 288 | Step-by-step solution | Challenge discussion

    Remove BracketsNot Completed

    Solutions: 414 | Step-by-step solution | Challenge discussion

    Command LineNot Completed

    Solutions: 185 | Step-by-step solution | Challenge discussion

    Star RatingNot Completed

    Solutions: 383 | Step-by-step solution | Challenge discussion

    Moving MedianNot Completed

    Solutions: 157 | Step-by-step solution | Challenge discussion

    Group TotalsNot Completed

    Solutions: 109 | Step-by-step solution | Challenge discussion

    Medium Difficulty

    Prime TimeNot Completed

    Solutions: 11987 | Step-by-step solution | Challenge discussion

    Run Length Not Completed

    Solutions: 8529 | Step-by-step solution | Challenge discussion

    Prime MoverNot Completed

    Solutions: 7417 | Step-by-step solution | Challenge discussion

    Palindrome TwoNot Completed

    Solutions: 7090 | Step-by-step solution | Challenge discussion

    DivisionNot Completed

    Solutions: 6603 | Step-by-step solution | Challenge discussion

    String ScrambleNot Completed

    Solutions: 7222 | Step-by-step solution | Challenge discussion

    Arith Geo IINot Completed

    Solutions: 4974 | Step-by-step solution | Challenge discussion

    Array AdditionNot Completed

    Solutions: 4366 | Step-by-step solution | Challenge discussion

    Binary ConverterNot Completed

    Solutions: 4501 | Step-by-step solution | Challenge discussion

    Letter CountNot Completed

    Solutions: 4457 | Step-by-step solution | Challenge discussion

    Caesar CipherNot Completed

    Solutions: 5113 | Step-by-step solution | Challenge discussion

    Simple ModeNot Completed

    Solutions: 4986 | Step-by-step solution | Challenge discussion

    ConsecutiveNot Completed

    Solutions: 4088 | Step-by-step solution | Challenge discussion

    Formatted DivisionNot Completed

    Solutions: 3774 | Step-by-step solution | Challenge discussion

    Counting MinutesNot Completed

    Solutions: 2775 | View all user solutions | Challenge discussion

    Permutation StepNot Completed

    Solutions: 3294 | View all user solutions | Challenge discussion

    Prime CheckerNot Completed

    Solutions: 2531 | View all user solutions | Challenge discussion

    Dash Insert IINot Completed

    Solutions: 4894 | View all user solutions | Challenge discussion

    Swap IINot Completed

    Solutions: 2725 | View all user solutions | Challenge discussion

    Number SearchNot Completed

    Solutions: 3339 | View all user solutions | Challenge discussion

    Triple DoubleNot Completed

    Solutions: 3107 | View all user solutions | Challenge discussion

    Bracket MatcherNot Completed

    Solutions: 2825 | View all user solutions | Challenge discussion

    String ReductionNot Completed

    Solutions: 2331 | View all user solutions | Challenge discussion

    ThreeFive MultiplesNot Completed

    Solutions: 2824 | View all user solutions | Challenge discussion

    Binary Search Tree LCANot Completed

    Solutions: 253 | View all user solutions | Challenge discussion

    Coin DeterminerNot Completed

    Solutions: 2290 | View all user solutions | Challenge discussion

    Fibonacci CheckerNot Completed

    Solutions: 2641 | View all user solutions | Challenge discussion

    Multiple BracketsNot Completed

    Solutions: 2336 | View all user solutions | Challenge discussion

    Most Free TimeNot Completed

    Solutions: 1410 | View all user solutions | Challenge discussion

    Overlapping RectanglesNot Completed

    Solutions: 1612 | View all user solutions | Challenge discussion

    Look Say SequenceNot Completed

    Solutions: 1467 | View all user solutions | Challenge discussion

    Distinct ListNot Completed

    Solutions: 2394 | View all user solutions | Challenge discussion

    Number EncodingNot Completed

    Solutions: 1486 | View all user solutions | Challenge discussion

    Stock PickerNot Completed

    Solutions: 734 | View all user solutions | Challenge discussion

    Max SubarrayNot Completed

    Solutions: 647 | View all user solutions | Challenge discussion

    Missing DigitNot Completed

    Solutions: 447 | View all user solutions | Challenge discussion

    K Unique CharactersNot Completed

    Solutions: 442 | View all user solutions | Challenge discussion

    Bitmap HolesNot Completed

    Solutions: 320 | View all user solutions | Challenge discussion

    Symmetric TreeNot Completed

    Solutions: 281 | View all user solutions | Challenge discussion

    Binary Tree LCANot Completed

    Solutions: 146 | View all user solutions | Challenge discussion

    LRU CacheNot Completed

    Solutions: 184 | View all user solutions | Challenge discussion

    Tree ConstructorNot Completed

    Solutions: 292 | View all user solutions | Challenge discussion

    Array Min JumpsNot Completed

    Solutions: 221 | View all user solutions | Challenge discussion

    Nearest Smaller ValuesNot Completed

    Solutions: 392 | View all user solutions | Challenge discussion

    Matrix SpiralNot Completed

    Solutions: 192 | View all user solutions | Challenge discussion

    Word SplitNot Completed

    Solutions: 353 | View all user solutions | Challenge discussion

    Pair SearchingNot Completed

    Solutions: 120 | View all user solutions | Challenge discussion

    Boggle SolverNot Completed

    Solutions: 91 | View all user solutions | Challenge discussion

    HTML ElementsNot Completed

    Solutions: 151 | View all user solutions | Challenge discussion

    Missing Digit IINot Completed

    Solutions: 149 | View all user solutions | Challenge discussion

    Palindromic SubstringNot Completed

    Solutions: 256 | View all user solutions | Challenge discussion

    Trapping WaterNot Completed

    Solutions: 150 | View all user solutions | Challenge discussion

    Matrix PathNot Completed

    Solutions: 77 | View all user solutions | Challenge discussion

    Seating StudentsNot Completed

    Solutions: 148 | View all user solutions | Challenge discussion

    Longest Matrix PathNot Completed

    Solutions: 70 | View all user solutions | Challenge discussion

    Min Window SubstringNot Completed

    Solutions: 148 | View all user solutions | Challenge discussion

    Matrix ChainsNot Completed

    Solutions: 66 | View all user solutions | Challenge discussion

    Histogram AreaNot Completed

    Solutions: 116 | View all user solutions | Challenge discussion

    Matching CharactersNot Completed

    Solutions: 161 | View all user solutions | Challenge discussion

    Ternary ConverterNot Completed

    Solutions: 90 | View all user solutions | Challenge discussion

    Linear CongruenceNot Completed

    Solutions: 52 | View all user solutions | Challenge discussion

    Formatted NumberNot Completed

    Solutions: 189 | View all user solutions | Challenge discussion

    Largest Row ColumnNot Completed

    Solutions: 54 | View all user solutions | Challenge discussion

    Eight QueensNot Completed

    Solutions: 817 | View all user solutions | Challenge discussion

    Three PointsNot Completed

    Solutions: 123 | View all user solutions | Challenge discussion

    Character RemovalNot Completed

    Solutions: 137 | View all user solutions | Challenge discussion

    Simple PasswordNot Completed

    Solutions: 188 | View all user solutions | Challenge discussion

    Preorder TraversalNot Completed

    Solutions: 86 | View all user solutions | Challenge discussion

    String ZigzagNot Completed

    Solutions: 92 | View all user solutions | Challenge discussion

    Off BinaryNot Completed

    Solutions: 81 | View all user solutions | Challenge discussion

    Longest ConsecutiveNot Completed

    Solutions: 287 | View all user solutions | Challenge discussion

    String ExpressionNot Completed

    Solutions: 132 | View all user solutions | Challenge discussion

    Charlie the DogNot Completed

    Solutions: 69 | View all user solutions | Challenge discussion

    Plus MinusNot Completed

    Solutions: 112 | View all user solutions | Challenge discussion

    Hard Difficulty

    Sudoku Quadrant CheckerNot Completed

    Solutions: 113 | View all user solutions | Challenge discussion

    Optimal AssignmentsNot Completed

    Solutions: 511 | View all user solutions | Challenge discussion

    Transitivity RelationsNot Completed

    Solutions: 413 | View all user solutions | Challenge discussion

    Shortest PathNot Completed

    Solutions: 1153 | View all user solutions | Challenge discussion

    Polynomial ExpansionNot Completed

    Solutions: 290 | View all user solutions | Challenge discussion

    CalculatorNot Completed

    Solutions: 1159 | View all user solutions | Challenge discussion

    Pattern ChaserNot Completed

    Solutions: 755 | View all user solutions | Challenge discussion

    Weighted PathNot Completed

    Solutions: 362 | View all user solutions | Challenge discussion

    RREF MatrixNot Completed

    Solutions: 124 | View all user solutions | Challenge discussion

    Intersecting LinesNot Completed

    Solutions: 566 | View all user solutions | Challenge discussion

    Kaprekars ConstantNot Completed

    Solutions: 3799 | View all user solutions | Challenge discussion

    Hamiltonian PathNot Completed

    Solutions: 142 | View all user solutions | Challenge discussion

    Step WalkingNot Completed

    Solutions: 106 | View all user solutions | Challenge discussion

    Gas StationNot Completed

    Solutions: 580 | View all user solutions | Challenge discussion

    Symmetric MatrixNot Completed

    Solutions: 405 | View all user solutions | Challenge discussion

    Switch SortNot Completed

    Solutions: 283 | View all user solutions | Challenge discussion

    Matrix DeterminantNot Completed

    Solutions: 267 | View all user solutions | Challenge discussion

    Queen CheckNot Completed

    Solutions: 466 | View all user solutions | Challenge discussion

    Noughts DeterminerNot Completed

    Solutions: 379 | View all user solutions | Challenge discussion

    Blackjack HighestNot Completed

    Solutions: 521 | View all user solutions | Challenge discussion

    Alphabet Run EncryptionNot Completed

    Solutions: 246 | View all user solutions | Challenge discussion

    Vertex CoveringNot Completed

    Solutions: 141 | View all user solutions | Challenge discussion

    Knight JumpsNot Completed

    Solutions: 522 | View all user solutions | Challenge discussion

    Farthest NodesNot Completed

    Solutions: 152 | View all user solutions | Challenge discussion

    Line OrderingNot Completed

    Solutions: 67 | View all user solutions | Challenge discussion

    Quick KnightNot Completed

    Solutions: 61 | View all user solutions | Challenge discussion

    Square FiguresNot Completed

    Solutions: 147 | View all user solutions | Challenge discussion

    Connect Four WinnerNot Completed

    Solutions: 107 | View all user solutions | Challenge discussion

    Array JumpingNot Completed

    Solutions: 80 | View all user solutions | Challenge discussion

    Matrix BorderNot Completed

    Solutions: 66 | View all user solutions | Challenge discussion

    Roman Numeral ReductionNot Completed

    Solutions: 92 | View all user solutions | Challenge discussion

    Parallel SumsNot Completed

    Solutions: 146 | View all user solutions | Challenge discussion

    LCSNot Completed

    Solutions: 88 | View all user solutions | Challenge discussion

    Nim WinnerNot Completed

    Solutions: 53 | View all user solutions | Challenge discussion

    Pascals TriangleNot Completed

    Solutions: 110 | View all user solutions | Challenge discussion

    Reverse Polish NotationNot Completed

    Solutions: 218 | View all user solutions | Challenge discussion

    Max Heap CheckerNot Completed

    Solutions: 103 | View all user solutions | Challenge discussion

    Chessboard TravelingNot Completed

    Solutions: 1583 | View all user solutions | Challenge discussion

    Matching CouplesNot Completed

    Solutions: 120 | View all user solutions | Challenge discussion

    Approaching FibonacciNot Completed

    Solutions: 138 | View all user solutions | Challenge discussion

    Simple SATNot Completed

    Solutions: 74 | View all user solutions | Challenge discussion

    Array CouplesNot Completed

    Solutions: 112 | View all user solutions | Challenge discussion

    Bracket CombinationsNot Completed

    Solutions: 132 | View all user solutions | Challenge discussion

    Counting AnagramsNot Completed

    Solutions: 163 | View all user solutions | Challenge discussion

    Array RotationNot Completed

    Solutions: 173 | View all user solutions | Challenge discussion

    Maximal SquareNot Completed

    Solutions: 1010 | View all user solutions | Challenge discussion

    Maximal RectangleNot Completed

    Solutions: 42 | View all user solutions | Challenge discussion

    Bipartite MatchingNot Completed

    Solutions: 42 | View all user solutions | Challenge discussion

    Pentagonal NumberNot Completed

    Solutions: 1111 | View all user solutions | Challenge discussion

    City TrafficNot Completed

    Solutions: 45 | View all user solutions | Challenge discussion

    Convex Hull PointsNot Completed

    Solutions: 29 | View all user solutions | Challenge discussion

    Wildcard CharactersNot Completed

    Solutions: 78 | View all user solutions | Challenge discussion

    Tetris MoveNot Completed

    Solutions: 18 | View all user solutions | Challenge discussion

    Difficulty

    Companies

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    • Microsoft 20
    • Amazon 12

    Bootcamps

    • Hack Reactor 83
    • Fullstack Academy 83
    • Grace Hopper 83
    • App Academy 83
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    All Tags

    • searching 101
    • array 70
    • string manipulation 59
    • math fundamentals 55
    • 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