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Problems
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Problems

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Difficulty
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4506
Pyrotechnician - 2
Very easy
4538
Vasya and balls
Very easy
4539
Observant Vasya
Very easy
4540
Hanoi Tower
Hard
4556
Counting Triangles
Very easy
4561
Irreducible Polynomials High
Very easy
4565
High Fence Coloring
Very easy
4573
Quadratic Permutation High
Easy
4597
Embedded circles
Hard
4604
Lake
Easy
4606
Need for sum thing
Easy
4607
Open air
Very easy
4627
Hexagon
Hard
4629
Hexagonal Routes
Hard
4630
Towers
Medium
4643
News
Hard
4648
One-two
Very easy
4651
A lock in the form of a mini-game
Hard
4652
Number of requests
Very hard
4654
Robot horse
Very hard
4665
False RSA
Very easy
4679
Mountain Holidays
Very easy
4680
Divisors
Easy
4715
Lovely Elephants
Very easy
4725
Sum of squares
Very easy
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