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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
Completely Non-zero Determinant
Easy
1930
Fast Typing
Very hard
1931
XYZX 2009
Very easy
1932
Greatest Greatest Common Divisor
Very easy
1933
Colored Wizards - 2
Very easy
1934
Graph of operations
Very easy
1935
Regular matching
Very hard
1936
Flights
Very easy
1937
Fire safety
Very easy
1938
Island Nations
Easy
1939
King
Easy
1940
Ice rink
1941
Ancestor
Easy
1942
Inevitability
Very easy
1943
Bridges
Very easy
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