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6854
How Many Days Are There?
Very hard
6855
Cut out
Hard
6856
Cocktail
Very hard
6857
Increasing subsequences
Very hard
6858
Map Generator
Easy
6859
Map Generator returns (MG-II)
Easy
6860
Trigonometric optimization
Very hard
6861
Supersquare
Very hard
6862
Pseudographical recognizer
Medium
6863
"Roman" corridor
Easy
6864
Parabolic teleports
Hard
6865
Magic pyramid
Very hard
6875
ABC for blind
Medium
6880
Works
Easy
6897
Collatz Conjecture
Very easy
6898
Smart File Name Sorting
Medium
6899
RNA Molecules
Very hard
6900
Pirates
Hard
6901
Shuffling Strings
Easy
6902
Guess Number
Hard
6903
Subset Sum
Medium
6904
Minesweeper
Very hard
6905
Tunb Airline
Very hard
6906
Fortune Team
Very easy
6907
Encrypted SMS
Very easy
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