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Problems

Number theory
Difficulty
Sort by
9643
Catalan numbers
Easy
9686
City of Lights
10032
Positive tests
Medium
10072
Only there wouldn't be simple ones
Very hard
10100
Pythagoras's Revenge
Easy
10163
Digital Tree
Easy
10170
A * B + C
Very easy
10253
F. Nastya and Decryption
Very easy
10314
Exercise (Platinum)
10356
Kozak Vus and a chip
Easy
10416
Cow Gymnasts
Easy
10491
NSD
Easy
10502
Denominator
Hard
10658
Zeroes
Medium
10750
Максимальний НСД
Medium
10917
Meeting of Friends
Easy
11037
Coins
Medium
11057
Important scientific number
Medium
11107
GCD vs. XOR
Easy
11116
Number series
Very easy
11341
Split into composite numbers
Very easy
11458
З римської у арабську
Medium
11713
Math Test
Easy
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