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Viper 안쓰는데 didSet을 Observable로 말씀하신 것 같네요. cellForRowAtIndexPath가 긴 것은 싫어서 객체 생성 묶음은 다른 function(cell에 붙이는 subviews)으로 빼고. 셀에서 생성된 객체를 담는 객체 포인터 연결로 테이블에서 뷰 수정하는게 아니라 해당 포인터에 연결된 객체를 변경 시키는 것은 notification center 메세지 받거나 서버 콜백 함수, singleton으로 만들어진 전역 flag를 따라 자동 변경되니 

 

 

FREE TRIALEASY  BugfixingLeaderSorted Subtypes: bug-fixing Time: recommended limit 40 min Find and correct bugs in a function that finds a value that occurs in more than half of the elements of an array. add FREE TRIALHARD  CountMultiplicativePairs Subtypes: math, sorting Time: recommended limit 55 min Count the number of pairs (x, y) such that x * y >= x + y. add FREE TRIALMEDIUM  DeepestPit Subtypes: Time: recommended limit 60 min Given an array of integers, find a bitonic sequence with maximal difference between the middle term and the first and the last terms. add FREE TRIALHARD  MinAbsSliceSum Subtypes: sorting Time: recommended limit 55 min Find a slice with the minimal absolute total. add FREE TRIALEASY  PtrListLen Subtypes: coding, lists, pointers Time: recommended limit 25 min Compute the length of single-link list without a cycle. add FREE TRIALEASY  SqlSum Subtypes: sql Time: recommended limit 15 min Calculate sum of elements. add MEDIUM  AdjacentPointsMinDistance   HARD  AdjacentValuesMaxDistance   HARD  AdjacentValuesMinDistance   HARD  ArithSliceCount   EASY  ArrListLen   HARD  BaseNeg2Addition   HARD  BaseNeg2Inc   HARD  BaseNeg2Inv   MEDIUM  Battleships   EASY  BitcountInProduct   MEDIUM  BracketStringSplit   HARD  BreakTheChain   HARD  BroadestPathInMatrix   MEDIUM  BugfixingBinaryPeriod   EASY  BugfixingBisection   MEDIUM  BugfixingCoins   EASY  BugfixingConsecutiveIntegers   EASY  BugfixingFavoriteNumber   EASY  BugfixingFindCommonMin   EASY  BugfixingLargestRightCyclicShift   EASY  BugfixingMaxNonnegSliceSum   EASY  BugfixingMaxOnesSpan   EASY  BugfixingMostOften   HARD  BugfixingNails   EASY  CastleBuilding   EASY  CentralSphereCoverageSize   HARD  CircleIntersectionArea   MEDIUM  CitiesDistances   EASY  CodingArithSliceCount   EASY  CodingDecReprSenior   EASY  CodingEqui2DCount   EASY  CodingMaxBiValuedSlice   ELEMENTARY  CodingOnesInArithSeq   EASY  CodingPrefixPermutations   HARD  CodingSimilarIntegerCount   MEDIUM  CodingSortedSwap   EASY  CodingWholeSquareCount   HARD  ConvexClosureInteriorVertexes   HARD  ConvexHullSize   MEDIUM  CountCollinearTriplets   HARD  CountConformingBitmasks   HARD  CountIdenticalPairs   HARD  CountIncreasingSubsequences   HARD  CountZeroSumSlices   HARD  CountriesCount   EASY  CurriculumVitae   HARD  CyclicAutomorphisms   EASY  DecReprSenior   HARD  DecimalRepr   MEDIUM  DecimalReprZip   EASY  DigitlessPassword   MEDIUM  ElevatorStops   EASY  Equi2DCount   MEDIUM  Equi3Positive   MEDIUM  Fib   MEDIUM  FileListVar (variant task)   ELEMENTARY  FizzBuzzWoof   EASY  FormatArray   EASY  FormatPhoneNumber   EASY  FourDigits   HARD  GeneralFib   HARD  HolidayAdvisor   EASY  IntegerBinConstruction   EASY  IntegerDecimalOccurrence   MEDIUM  IntegerReductionCount   HARD  IntervalUnfoldCount   HARD  IntervalUnfoldSequence   MEDIUM  JsCaptcha   MEDIUM  JsFormValidation   EASY  JsListDepth   EASY  LargestSequenceGap   EASY  LastBoundedElement   MEDIUM  LimitedBinomialCoefficient   HARD  LongestMatrixMonotonicSequence   MEDIUM  LongestQuasiconstSubseq   EASY  LongestSentence   MEDIUM  MapCartesianToSpiral   HARD  MatrixAutomorphicCyclicShiftsCount   HARD  MaxAlignedSubset   HARD  MaxAlternatingSlice   HARD  MaxBiValuedSlice   HARD  MaxFixedSumSlice   MEDIUM  MaxMaxDifference   EASY  MaxNonnegSliceSum   HARD  MaxOddDecomposition   MEDIUM  MaxOscillatingSlice   EASY  MaxPerimeterTriangle   HARD  MaxPowerFuncResult   MEDIUM  MaxSliceProduct   MEDIUM  MaxSumDistance   HARD  MaxSwitchingSlice   EASY  MinAnagrams   HARD  MinBinarianEquivalent   HARD  MinCountOfKnightMoves   EASY  MinDist   HARD  MinMergeTime   HARD  MinPerimeterTriangle   MEDIUM  ModuleLineIterator   HARD  ModuleShopping   HARD  MonkeyRiver   EASY  Monotone   EASY  MonotonicSegmentCount   HARD  NextSparseBinary   HARD  OnesInArithSeq   MEDIUM  OptimizingFarthestDifferent   EASY  OptimizingFarthestEqual   EASY  ParkingBill   EASY  PermCycles   MEDIUM  PhoneBilling   EASY  PlaneSeatingReservation   HARD  PolyCoefsSum   MEDIUM  Pow11   EASY  PrefixPermutations   MEDIUM  PublicTransportTickets   MEDIUM  PublicTransportTicketsAlgo   HARD  Rectiarea   ELEMENTARY  ReversingCoins   EASY  SaddleCount   MEDIUM  Seq23   HARD  ShortestKnightPath   HARD  ShortestSliceToRemove   MEDIUM  ShortestSliceToSort   HARD  SimilarIntegerCount   EASY  SkylinePaint   MEDIUM  SortedSwap   MEDIUM  SparseBinaryDecomposition   MEDIUM  SqlBigTransfers   EASY  SqlDepartments   MEDIUM  SqlEventsDelta   EASY  SqlInvSum   EASY  SqlInvSumDesc   EASY  SqlSensorTypes   EASY  SqlSensorsMostRecent   MEDIUM  SqlWorldCup   HARD  StrPrefsuf   MEDIUM  StringOcrMatch   EASY  StringReducibility   HARD  SumOfPowersOfMinusTwo   ELEMENTARY  SumTwoDigitNumbers   ELEMENTARY  TimeInSeconds   MEDIUM  Times17DecDigitsSum   HARD  Times3Bitcount   MEDIUM  TransactionalStack   MEDIUM  TreeMostDistinctPath   EASY  TreeVisibility   HARD  Tricoloring   HARD  TurtleCrossing   EASY  TwoDigitHours   MEDIUM  UnionOfIntervals   MEDIUM  UpperSpiralSum   EASY  WholeSquareCount   MEDIUM  WholeWeeks   MEDIUM  WordMachineEmulator   HARD  XorProduct