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    Maximal SquareNot Completed

    Solutions: 4280 | View user solutions | Added 05/21/16

    Pentagonal NumberNot Completed

    Solutions: 4316 | View user solutions | Added 08/31/16

    Eight QueensNot Completed

    Solutions: 3273 | View user solutions | Added 11/06/16

    Free Challenges

    Longest WordNot Completed

    Solutions: 103444 | Step-by-step solution | Challenge discussion

    First FactorialNot Completed

    Solutions: 149628 | Step-by-step solution | Challenge discussion

    First ReverseNot Completed

    Solutions: 163350 | Step-by-step solution | Challenge discussion

    Letter ChangesNot Completed

    Solutions: 104973 | Step-by-step solution | Challenge discussion

    Simple AddingNot Completed

    Solutions: 84766 | Step-by-step solution | Challenge discussion

    Letter CapitalizeNot Completed

    Solutions: 72466 | Step-by-step solution | Challenge discussion

    Simple SymbolsNot Completed

    Solutions: 61628 | Step-by-step solution | Challenge discussion

    Check NumsNot Completed

    Solutions: 61953 | Step-by-step solution | Challenge discussion

    Time ConvertNot Completed

    Solutions: 47873 | Step-by-step solution | Challenge discussion

    Alphabet SoupNot Completed

    Solutions: 42954 | Step-by-step solution | Challenge discussion

    Kaprekars ConstantNot Completed

    Solutions: 10206 | View all user solutions | Challenge discussion

    Chessboard TravelingNot Completed

    Solutions: 4396 | View all user solutions | Challenge discussion

    Maximal SquareNot Completed

    Solutions: 4280 | View all user solutions | Challenge discussion

    Pentagonal NumberNot Completed

    Solutions: 4316 | View all user solutions | Challenge discussion

    Correct PathNot Completed

    Solutions: 2909 | View all user solutions | Challenge discussion

    Scale BalancingNot Completed

    Solutions: 4338 | View all user solutions | Challenge discussion

    Vowel SquareNot Completed

    Solutions: 2672 | View all user solutions | Challenge discussion

    Eight QueensNot Completed

    Solutions: 3273 | View all user solutions | Challenge discussion

    Closest Enemy IINot Completed

    Solutions: 2624 | View all user solutions | Challenge discussion

    Questions MarksNot Completed

    Solutions: 6896 | View all user solutions | Challenge discussion

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    Easy Difficulty

    First ReverseNot Completed

    Solutions: 163350 | Step-by-step solution | Challenge discussion

    First FactorialNot Completed

    Solutions: 149628 | Step-by-step solution | Challenge discussion

    Longest WordNot Completed

    Solutions: 103444 | Step-by-step solution | Challenge discussion

    Letter ChangesNot Completed

    Solutions: 104973 | Step-by-step solution | Challenge discussion

    Simple AddingNot Completed

    Solutions: 84766 | Step-by-step solution | Challenge discussion

    Letter CapitalizeNot Completed

    Solutions: 72466 | Step-by-step solution | Challenge discussion

    Simple SymbolsNot Completed

    Solutions: 61628 | Step-by-step solution | Challenge discussion

    Check NumsNot Completed

    Solutions: 61953 | Step-by-step solution | Challenge discussion

    Time ConvertNot Completed

    Solutions: 47873 | Step-by-step solution | Challenge discussion

    Alphabet SoupNot Completed

    Solutions: 42954 | Step-by-step solution | Challenge discussion

    AB CheckNot Completed

    Solutions: 18014 | Step-by-step solution | Challenge discussion

    Vowel CountNot Completed

    Solutions: 16508 | Step-by-step solution | Challenge discussion

    Word CountNot Completed

    Solutions: 15475 | Step-by-step solution | Challenge discussion

    Ex OhNot Completed

    Solutions: 15164 | Step-by-step solution | Challenge discussion

    PalindromeNot Completed

    Solutions: 17830 | Step-by-step solution | Challenge discussion

    Arith GeoNot Completed

    Solutions: 14250 | Step-by-step solution | Challenge discussion

    Array Addition INot Completed

    Solutions: 9312 | Step-by-step solution | Challenge discussion

    Letter Count INot Completed

    Solutions: 8444 | Step-by-step solution | Challenge discussion

    Second GreatLowNot Completed

    Solutions: 14074 | Step-by-step solution | Challenge discussion

    Division StringifiedNot Completed

    Solutions: 10410 | Step-by-step solution | Challenge discussion

    Counting Minutes INot Completed

    Solutions: 6186 | Step-by-step solution | Challenge discussion

    Mean ModeNot Completed

    Solutions: 8118 | Step-by-step solution | Challenge discussion

    Dash InsertNot Completed

    Solutions: 9155 | Step-by-step solution | Challenge discussion

    Swap CaseNot Completed

    Solutions: 8542 | Step-by-step solution | Challenge discussion

    Number AdditionNot Completed

    Solutions: 8489 | Step-by-step solution | Challenge discussion

    Third GreatestNot Completed

    Solutions: 8138 | Step-by-step solution | Challenge discussion

    Powers of TwoNot Completed

    Solutions: 8792 | Step-by-step solution | Challenge discussion

    Additive PersistenceNot Completed

    Solutions: 6396 | Step-by-step solution | Challenge discussion

    Multiplicative PersistenceNot Completed

    Solutions: 4946 | Step-by-step solution | Challenge discussion

    Off Line MinimumNot Completed

    Solutions: 6615 | Step-by-step solution | Challenge discussion

    Changing SequenceNot Completed

    Solutions: 3262 | Step-by-step solution | Challenge discussion

    Overlapping RangesNot Completed

    Solutions: 2954 | Step-by-step solution | Challenge discussion

    SuperincreasingNot Completed

    Solutions: 2966 | Step-by-step solution | Challenge discussion

    Hamming DistanceNot Completed

    Solutions: 2072 | Step-by-step solution | Challenge discussion

    Rectangle AreaNot Completed

    Solutions: 2495 | Step-by-step solution | Challenge discussion

    Bitwise OneNot Completed

    Solutions: 2014 | Step-by-step solution | Challenge discussion

    Other ProductsNot Completed

    Solutions: 2108 | Step-by-step solution | Challenge discussion

    Wave SortingNot Completed

    Solutions: 1554 | Step-by-step solution | Challenge discussion

    Array MatchingNot Completed

    Solutions: 1910 | Step-by-step solution | Challenge discussion

    Binary ReversalNot Completed

    Solutions: 1673 | Step-by-step solution | Challenge discussion

    Longest Increasing SequenceNot Completed

    Solutions: 1917 | Step-by-step solution | Challenge discussion

    Even PairsNot Completed

    Solutions: 1405 | Step-by-step solution | Challenge discussion

    Next PalindromeNot Completed

    Solutions: 1349 | Step-by-step solution | Challenge discussion

    Largest PairNot Completed

    Solutions: 1598 | Step-by-step solution | Challenge discussion

    Nonrepeating CharacterNot Completed

    Solutions: 2060 | Step-by-step solution | Challenge discussion

    Two SumNot Completed

    Solutions: 2730 | Step-by-step solution | Challenge discussion

    Bitwise TwoNot Completed

    Solutions: 897 | Step-by-step solution | Challenge discussion

    Power Set CountNot Completed

    Solutions: 1233 | Step-by-step solution | Challenge discussion

    Product DigitsNot Completed

    Solutions: 1535 | Step-by-step solution | Challenge discussion

    Palindrome CreatorNot Completed

    Solutions: 1596 | Step-by-step solution | Challenge discussion

    Basic Roman NumeralsNot Completed

    Solutions: 953 | Step-by-step solution | Challenge discussion

    Food DistributionNot Completed

    Solutions: 930 | Step-by-step solution | Challenge discussion

    Three SumNot Completed

    Solutions: 1034 | Step-by-step solution | Challenge discussion

    Correct PathNot Completed

    Solutions: 2909 | Step-by-step solution | Challenge discussion

    Scale BalancingNot Completed

    Solutions: 4338 | Step-by-step solution | Challenge discussion

    Three NumbersNot Completed

    Solutions: 919 | Step-by-step solution | Challenge discussion

    Alphabet SearchingNot Completed

    Solutions: 787 | Step-by-step solution | Challenge discussion

    Time DifferenceNot Completed

    Solutions: 595 | Step-by-step solution | Challenge discussion

    Triangle RowNot Completed

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

    Vowel SquareNot Completed

    Solutions: 2672 | Step-by-step solution | Challenge discussion

    Closest EnemyNot Completed

    Solutions: 762 | Step-by-step solution | Challenge discussion

    Closest Enemy IINot Completed

    Solutions: 2624 | Step-by-step solution | Challenge discussion

    Number StreamNot Completed

    Solutions: 531 | Step-by-step solution | Challenge discussion

    Largest FourNot Completed

    Solutions: 908 | Step-by-step solution | Challenge discussion

    Distinct CharactersNot Completed

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

    Questions MarksNot Completed

    Solutions: 6896 | Step-by-step solution | Challenge discussion

    Camel CaseNot Completed

    Solutions: 633 | Step-by-step solution | Challenge discussion

    ASCII ConversionNot Completed

    Solutions: 442 | Step-by-step solution | Challenge discussion

    Simple EvensNot Completed

    Solutions: 588 | Step-by-step solution | Challenge discussion

    Snake CaseNot Completed

    Solutions: 626 | Step-by-step solution | Challenge discussion

    Sum MultiplierNot Completed

    Solutions: 656 | Step-by-step solution | Challenge discussion

    String MergeNot Completed

    Solutions: 631 | Step-by-step solution | Challenge discussion

    One DecrementedNot Completed

    Solutions: 561 | Step-by-step solution | Challenge discussion

    Element MergerNot Completed

    Solutions: 620 | Step-by-step solution | Challenge discussion

    GCFNot Completed

    Solutions: 602 | Step-by-step solution | Challenge discussion

    Serial NumberNot Completed

    Solutions: 746 | Step-by-step solution | Challenge discussion

    String PeriodsNot Completed

    Solutions: 617 | Step-by-step solution | Challenge discussion

    Palindrome SwapperNot Completed

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

    Remove BracketsNot Completed

    Solutions: 685 | Step-by-step solution | Challenge discussion

    Command LineNot Completed

    Solutions: 305 | Step-by-step solution | Challenge discussion

    Star RatingNot Completed

    Solutions: 996 | Step-by-step solution | Challenge discussion

    Moving MedianNot Completed

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

    Group TotalsNot Completed

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

    String ChangesNot Completed

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

    FizzBuzzNot Completed

    Solutions: 1426 | Step-by-step solution | Challenge discussion

    H DistanceNot Completed

    Solutions: 209 | Step-by-step solution | Challenge discussion

    Different CasesNot Completed

    Solutions: 232 | Step-by-step solution | Challenge discussion

    Medium Difficulty

    Prime TimeNot Completed

    Solutions: 13353 | Step-by-step solution | Challenge discussion

    Run Length Not Completed

    Solutions: 8984 | Step-by-step solution | Challenge discussion

    Prime MoverNot Completed

    Solutions: 7861 | Step-by-step solution | Challenge discussion

    Palindrome TwoNot Completed

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

    DivisionNot Completed

    Solutions: 6924 | Step-by-step solution | Challenge discussion

    String ScrambleNot Completed

    Solutions: 7759 | Step-by-step solution | Challenge discussion

    Arith Geo IINot Completed

    Solutions: 5232 | Step-by-step solution | Challenge discussion

    Array AdditionNot Completed

    Solutions: 4901 | Step-by-step solution | Challenge discussion

    Binary ConverterNot Completed

    Solutions: 4836 | Step-by-step solution | Challenge discussion

    Letter CountNot Completed

    Solutions: 4857 | Step-by-step solution | Challenge discussion

    Caesar CipherNot Completed

    Solutions: 5633 | Step-by-step solution | Challenge discussion

    Simple ModeNot Completed

    Solutions: 5216 | Step-by-step solution | Challenge discussion

    ConsecutiveNot Completed

    Solutions: 4312 | Step-by-step solution | Challenge discussion

    Formatted DivisionNot Completed

    Solutions: 3980 | Step-by-step solution | Challenge discussion

    Counting MinutesNot Completed

    Solutions: 2989 | View all user solutions | Challenge discussion

    Permutation StepNot Completed

    Solutions: 3754 | View all user solutions | Challenge discussion

    Prime CheckerNot Completed

    Solutions: 2698 | View all user solutions | Challenge discussion

    Dash Insert IINot Completed

    Solutions: 5118 | View all user solutions | Challenge discussion

    Swap IINot Completed

    Solutions: 3245 | View all user solutions | Challenge discussion

    Number SearchNot Completed

    Solutions: 3549 | View all user solutions | Challenge discussion

    Triple DoubleNot Completed

    Solutions: 3282 | View all user solutions | Challenge discussion

    Bracket MatcherNot Completed

    Solutions: 3064 | View all user solutions | Challenge discussion

    String ReductionNot Completed

    Solutions: 2646 | View all user solutions | Challenge discussion

    ThreeFive MultiplesNot Completed

    Solutions: 2958 | View all user solutions | Challenge discussion

    Binary Search Tree LCANot Completed

    Solutions: 486 | View all user solutions | Challenge discussion

    Coin DeterminerNot Completed

    Solutions: 2526 | View all user solutions | Challenge discussion

    Fibonacci CheckerNot Completed

    Solutions: 2880 | View all user solutions | Challenge discussion

    Multiple BracketsNot Completed

    Solutions: 2471 | View all user solutions | Challenge discussion

    Most Free TimeNot Completed

    Solutions: 1623 | View all user solutions | Challenge discussion

    Overlapping RectanglesNot Completed

    Solutions: 1718 | View all user solutions | Challenge discussion

    Look Say SequenceNot Completed

    Solutions: 1557 | View all user solutions | Challenge discussion

    Distinct ListNot Completed

    Solutions: 2713 | View all user solutions | Challenge discussion

    Number EncodingNot Completed

    Solutions: 1566 | View all user solutions | Challenge discussion

    Stock PickerNot Completed

    Solutions: 994 | View all user solutions | Challenge discussion

    Max SubarrayNot Completed

    Solutions: 850 | View all user solutions | Challenge discussion

    Missing DigitNot Completed

    Solutions: 629 | View all user solutions | Challenge discussion

    K Unique CharactersNot Completed

    Solutions: 1019 | View all user solutions | Challenge discussion

    Bitmap HolesNot Completed

    Solutions: 408 | View all user solutions | Challenge discussion

    Symmetric TreeNot Completed

    Solutions: 377 | View all user solutions | Challenge discussion

    Binary Tree LCANot Completed

    Solutions: 328 | View all user solutions | Challenge discussion

    LRU CacheNot Completed

    Solutions: 720 | View all user solutions | Challenge discussion

    Tree ConstructorNot Completed

    Solutions: 469 | View all user solutions | Challenge discussion

    Array Min JumpsNot Completed

    Solutions: 293 | View all user solutions | Challenge discussion

    Nearest Smaller ValuesNot Completed

    Solutions: 567 | View all user solutions | Challenge discussion

    Matrix SpiralNot Completed

    Solutions: 498 | View all user solutions | Challenge discussion

    Word SplitNot Completed

    Solutions: 791 | View all user solutions | Challenge discussion

    Pair SearchingNot Completed

    Solutions: 165 | View all user solutions | Challenge discussion

    Boggle SolverNot Completed

    Solutions: 153 | View all user solutions | Challenge discussion

    HTML ElementsNot Completed

    Solutions: 513 | View all user solutions | Challenge discussion

    Missing Digit IINot Completed

    Solutions: 200 | View all user solutions | Challenge discussion

    Palindromic SubstringNot Completed

    Solutions: 434 | View all user solutions | Challenge discussion

    Trapping WaterNot Completed

    Solutions: 214 | View all user solutions | Challenge discussion

    Matrix PathNot Completed

    Solutions: 336 | View all user solutions | Challenge discussion

    Seating StudentsNot Completed

    Solutions: 541 | View all user solutions | Challenge discussion

    Longest Matrix PathNot Completed

    Solutions: 96 | View all user solutions | Challenge discussion

    Min Window SubstringNot Completed

    Solutions: 925 | View all user solutions | Challenge discussion

    Matrix ChainsNot Completed

    Solutions: 95 | View all user solutions | Challenge discussion

    Histogram AreaNot Completed

    Solutions: 326 | View all user solutions | Challenge discussion

    Matching CharactersNot Completed

    Solutions: 440 | View all user solutions | Challenge discussion

    Ternary ConverterNot Completed

    Solutions: 121 | View all user solutions | Challenge discussion

    Linear CongruenceNot Completed

    Solutions: 73 | View all user solutions | Challenge discussion

    Formatted NumberNot Completed

    Solutions: 319 | View all user solutions | Challenge discussion

    Largest Row ColumnNot Completed

    Solutions: 92 | View all user solutions | Challenge discussion

    Eight QueensNot Completed

    Solutions: 3273 | View all user solutions | Challenge discussion

    Three PointsNot Completed

    Solutions: 181 | View all user solutions | Challenge discussion

    Character RemovalNot Completed

    Solutions: 220 | View all user solutions | Challenge discussion

    Simple PasswordNot Completed

    Solutions: 540 | View all user solutions | Challenge discussion

    Preorder TraversalNot Completed

    Solutions: 135 | View all user solutions | Challenge discussion

    String ZigzagNot Completed

    Solutions: 134 | View all user solutions | Challenge discussion

    Off BinaryNot Completed

    Solutions: 115 | View all user solutions | Challenge discussion

    Longest ConsecutiveNot Completed

    Solutions: 467 | View all user solutions | Challenge discussion

    String ExpressionNot Completed

    Solutions: 187 | View all user solutions | Challenge discussion

    Charlie the DogNot Completed

    Solutions: 230 | View all user solutions | Challenge discussion

    Plus MinusNot Completed

    Solutions: 548 | View all user solutions | Challenge discussion

    PrimesNot Completed

    Solutions: 141 | View all user solutions | Challenge discussion

    String CalculateNot Completed

    Solutions: 149 | View all user solutions | Challenge discussion

    Hard Difficulty

    Sudoku Quadrant CheckerNot Completed

    Solutions: 185 | View all user solutions | Challenge discussion

    Optimal AssignmentsNot Completed

    Solutions: 594 | View all user solutions | Challenge discussion

    Transitivity RelationsNot Completed

    Solutions: 442 | View all user solutions | Challenge discussion

    Shortest PathNot Completed

    Solutions: 1463 | View all user solutions | Challenge discussion

    Polynomial ExpansionNot Completed

    Solutions: 325 | View all user solutions | Challenge discussion

    CalculatorNot Completed

    Solutions: 1239 | View all user solutions | Challenge discussion

    Pattern ChaserNot Completed

    Solutions: 827 | View all user solutions | Challenge discussion

    Weighted PathNot Completed

    Solutions: 394 | View all user solutions | Challenge discussion

    RREF MatrixNot Completed

    Solutions: 143 | View all user solutions | Challenge discussion

    Intersecting LinesNot Completed

    Solutions: 620 | View all user solutions | Challenge discussion

    Kaprekars ConstantNot Completed

    Solutions: 10206 | View all user solutions | Challenge discussion

    Hamiltonian PathNot Completed

    Solutions: 176 | View all user solutions | Challenge discussion

    Step WalkingNot Completed

    Solutions: 162 | View all user solutions | Challenge discussion

    Gas StationNot Completed

    Solutions: 785 | View all user solutions | Challenge discussion

    Symmetric MatrixNot Completed

    Solutions: 456 | View all user solutions | Challenge discussion

    Switch SortNot Completed

    Solutions: 361 | View all user solutions | Challenge discussion

    Matrix DeterminantNot Completed

    Solutions: 287 | View all user solutions | Challenge discussion

    Queen CheckNot Completed

    Solutions: 655 | View all user solutions | Challenge discussion

    Noughts DeterminerNot Completed

    Solutions: 403 | View all user solutions | Challenge discussion

    Blackjack HighestNot Completed

    Solutions: 621 | View all user solutions | Challenge discussion

    Alphabet Run EncryptionNot Completed

    Solutions: 298 | View all user solutions | Challenge discussion

    Vertex CoveringNot Completed

    Solutions: 163 | View all user solutions | Challenge discussion

    Knight JumpsNot Completed

    Solutions: 548 | View all user solutions | Challenge discussion

    Farthest NodesNot Completed

    Solutions: 240 | View all user solutions | Challenge discussion

    Line OrderingNot Completed

    Solutions: 105 | View all user solutions | Challenge discussion

    Quick KnightNot Completed

    Solutions: 83 | View all user solutions | Challenge discussion

    Square FiguresNot Completed

    Solutions: 191 | View all user solutions | Challenge discussion

    Connect Four WinnerNot Completed

    Solutions: 136 | View all user solutions | Challenge discussion

    Array JumpingNot Completed

    Solutions: 103 | View all user solutions | Challenge discussion

    Matrix BorderNot Completed

    Solutions: 95 | View all user solutions | Challenge discussion

    Roman Numeral ReductionNot Completed

    Solutions: 122 | View all user solutions | Challenge discussion

    Parallel SumsNot Completed

    Solutions: 211 | View all user solutions | Challenge discussion

    LCSNot Completed

    Solutions: 166 | View all user solutions | Challenge discussion

    Nim WinnerNot Completed

    Solutions: 65 | View all user solutions | Challenge discussion

    Pascals TriangleNot Completed

    Solutions: 159 | View all user solutions | Challenge discussion

    Reverse Polish NotationNot Completed

    Solutions: 252 | View all user solutions | Challenge discussion

    Max Heap CheckerNot Completed

    Solutions: 121 | View all user solutions | Challenge discussion

    Chessboard TravelingNot Completed

    Solutions: 4396 | View all user solutions | Challenge discussion

    Matching CouplesNot Completed

    Solutions: 284 | View all user solutions | Challenge discussion

    Approaching FibonacciNot Completed

    Solutions: 180 | View all user solutions | Challenge discussion

    Simple SATNot Completed

    Solutions: 108 | View all user solutions | Challenge discussion

    Array CouplesNot Completed

    Solutions: 147 | View all user solutions | Challenge discussion

    Bracket CombinationsNot Completed

    Solutions: 166 | View all user solutions | Challenge discussion

    Counting AnagramsNot Completed

    Solutions: 264 | View all user solutions | Challenge discussion

    Array RotationNot Completed

    Solutions: 412 | View all user solutions | Challenge discussion

    Maximal SquareNot Completed

    Solutions: 4280 | View all user solutions | Challenge discussion

    Maximal RectangleNot Completed

    Solutions: 79 | View all user solutions | Challenge discussion

    Bipartite MatchingNot Completed

    Solutions: 106 | View all user solutions | Challenge discussion

    Pentagonal NumberNot Completed

    Solutions: 4316 | View all user solutions | Challenge discussion

    City TrafficNot Completed

    Solutions: 248 | View all user solutions | Challenge discussion

    Convex Hull PointsNot Completed

    Solutions: 60 | View all user solutions | Challenge discussion

    Wildcard CharactersNot Completed

    Solutions: 327 | View all user solutions | Challenge discussion

    Tetris MoveNot Completed

    Solutions: 156 | View all user solutions | Challenge discussion

    WildcardsNot Completed

    Solutions: 172 | View all user solutions | Challenge discussion

    Difficulty

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