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19 problems currently represented in the catalog.
1-bit and 2-bit CharactersEASY3Sum With MultiplicityMEDIUMConstruct Target Array With Multiple SumsHARDEncode NumberMEDIUMExam RoomMEDIUMFind Numbers with Even Number of DigitsEASYFind the K-Beauty of a NumberEASYFinding Pairs With a Certain SumMEDIUMGet Biggest Three Rhombus Sums in a GridMEDIUMInsert Delete GetRandom O(1)MEDIUMLongest Common PrefixEASYMaximum Number of Words You Can TypeEASYRange Frequency QueriesMEDIUMSerialize and Deserialize Binary TreeHARDSort the Matrix DiagonallyMEDIUMSubarray Sum Equals KMEDIUMSubstrings of Size Three with Distinct CharactersEASYSubtract the Product and Sum of Digits of an IntegerEASYText JustificationHARD
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