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10 problems currently represented in the catalog.
Coin ChangeMEDIUMDesign Hit CounterMEDIUMGroup AnagramsMEDIUMInsert Delete GetRandom O(1)MEDIUMInsert Delete GetRandom O(1) - Duplicates allowedHARDOptimal Account BalancingHARDParse Lisp ExpressionHARDShortest Uncommon Substring in an ArrayMEDIUMString CompressionMEDIUMValid AnagramEASY
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