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Problems

Graphs
Difficulty
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1914
ICPC
Very hard
1923
Tiny Puzzle
Very hard
1927
Perspective
Very easy
1933
Colored Wizards
Very easy
1935
Regular matching
Very hard
1936
Flights
Very easy
1937
Fire safety
Very easy
1938
Island Nations
Easy
1939
King
Easy
1942
Inevitability
Very easy
1943
Bridges
Very easy
1944
Colorful Wizards
Very easy
1945
Articulation Points
Very easy
1946
Mailman
Medium
1947
Condensation of the graph
Very easy
1948
Topological Sort
Very easy
1969
Sphere
Very hard
1975
The tightly bound son of the mountains
Hard
1977
Well, a very common method for graphs...
Easy
1978
Organizational Problems: A Topic for a Dissertation?
Easy
1979
Railroad
1982
Highways
Medium
1989
Maximum matching
1990
Domino 2
Very easy
1991
Maximum flow
Very easy
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