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Problems

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Difficulty
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1874
Holidays
Hard
1877
Tetris Game Validator
Hard
1885
Number of lines
Very easy
1886
Restoration of points quantity
Medium
1891
Mountain range
1899
Passage of the Corridor
Easy
1915
Numbers
Very easy
1916
English
Easy
1919
Automatic Input Verifier
Very hard
1931
XYZX 2009
Very easy
1949
Cake
Very easy
1950
School algebra
Easy
1951
IP-address
Very easy
1952
Contr-operation
1954
Mosaic
1955
Calendar
Very easy
1956
The young hacker
Very easy
1958
Is it divisible?
Easy
1961
Forest dwellers
Easy
1963
Theater
Very easy
1965
Line
Very easy
1966
A big plus
1968
Balls
Easy
1970
David Copperfield is resting
Very easy
1974
Random Acts of Kindness Day
Very easy
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