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6233
Fenwick Tree
Very easy
6239
Honey Bees
Very easy
6240
Repeating Decimals
Easy
6241
Solutions of Cubic Equation
Hard
6242
Multiplication in a Dihedral Group
Easy
6244
Sharkovski`s Ordering
Very easy
6246
More Fun in Bicol
Very hard
6253
Virus Replication
Very easy
6254
Timebomb
Very easy
6255
Erase Securely
6260
Arrangement of Contest
Very easy
6261
Ballot Analyzing Device
Very easy
6268
Intellectual Property
Very hard
6275
Удвоение
Very easy
6279
Количество дней в месяце
Very easy
6281
Банк
Easy
6282
Ставка
6284
Болезнь
Easy
6285
Разделение королевства
Very easy
6290
Супрематизм
Medium
6291
ASCII Art
6295
Exchange
Very hard
6300
Java vs C++
Very easy
6313
Палиндром
Medium
6314
Гостиница планеты Шелезяка
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