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Problems

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810
Old Songs About the Main - 4
Easy
812
Russian Lotto
Very easy
814
Path Through the Mountains 2
Very hard
815
Chess
Very hard
816
Races
Hard
817
Broken Calculator
Easy
818
Currency Manipulations
Very easy
819
Two-round Olympiad
Medium
820
Formula 1
Very hard
821
Grasshopper
Medium
822
Unpacking a line
Very easy
823
Warehouse
Medium
824
Gasoline
Easy
825
Game
Very hard
826
Furrows
Hard
827
Simple Factorials
Easy
828
Shooting Range
Very hard
829
Telebashnya
Very easy
830
Prime numbers
Very easy
831
Expression
Easy
832
Increasing subsequence
Easy
833
The triangle and the point
Very easy
834
Power
Very easy
835
Poker
Very easy
836
Prime numbers 2
Easy
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