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Problems

Math
Difficulty
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1780
Gray's Code
Very easy
1782
The sum of divisors
Easy
1813
Queen Collisions
Very easy
1818
Egyptian Fractions
Very easy
1820
Periodic points
Very easy
1842
Triangle
Very easy
1846
AVL-trees
Very easy
1847
Polynomial
Easy
1848
Bifurcation
Very easy
1856
Championship on fungi Sports
Very easy
1888
Secret Level
Medium
1889
Battlefields
Easy
1900
Game
Medium
1906
Anniversary
Hard
1908
Grid
Easy
1926
Number of Permutations
Very easy
1949
Cake
Very easy
1958
Divided it?
Easy
1961
Forest dwellers
Easy
1964
What is left?
Medium
1967
Winnie the Pooh
Easy
1974
Random Acts of Kindness Day
Very easy
1984
Fractions
Easy
1993
Weighing
Very easy
1996
Cupcakes
Easy
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