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Problems

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Difficulty
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1887
How to Break All Records
Medium
1888
Secret Level
Medium
1889
Battlefields
Easy
1890
Breaking the leaderboard
Medium
1891
Mountain range
1892
Construction of a warehouse
Very easy
1893
The Power of the Hero
Very easy
1894
Caravans
Very easy
1895
Who visits early in the morning
Easy
1896
Prince or Impostor
Very easy
1897
What? Where? When?
Very easy
1898
Tile Laying
Very easy
1899
Passage of the corridor
Easy
1900
Game
Medium
1902
A very friendly group
Easy
1903
Trees with an odd number of independent sets
Medium
1904
Maximum degree of a prime
Medium
1905
Minimum degree of prime
Medium
1906
Anniversary
Hard
1907
Trade
Hard
1908
Grid
Easy
1909
Drawing
1910
Empire
Very easy
1911
Reform
Very hard
1912
Constellation
Easy
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