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1913
Gifts
1914
ICPC
Very hard
1915
Numbers
Very easy
1916
English
Easy
1917
Diamond
Easy
1918
Puzzle
Easy
1919
Automatic Input Verifier
Very hard
1920
Friendly Points
Easy
1921
Expanding Lake
Very hard
1922
Octahedron And Dominoes
Easy
1923
Tiny Puzzle
Very hard
1924
Circular Island
Very hard
1925
Traffic Jam
Very hard
1926
Number of Permutations
Very easy
1927
Perspective
Very easy
1928
Enjoy Arithmetic Progressions
Very hard
1929
Copletely Non-zero Determinant
Easy
1930
Fast Typing
Very hard
1931
XYZX 2009
Very easy
1932
Greatest Greatest Commom Divisor
Very easy
1933
Colored Wizards
Very easy
1934
Graph of operations
Very easy
1935
Regular matching
Very hard
1936
Flights
Very easy
1937
Fire safety
Very easy
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