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Problems

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Difficulty
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1
Parallelepiped
Very easy
2
Grandchildren
Very easy
3
Colorful Balls
Easy
4
Colorful String
Easy
5
Painting stones
Medium
6
Pairwise Product
Medium
7
Sashko-Array Constructor
Medium
8
Sets
Medium
9
Pies
Very easy
10
Arithmetic Mean
Very easy
11
Cossack Vus and Friend at CP Olympiad
Easy
12
Add and Minimize
Medium
13
Magic Knights
Medium
14
Trivial? Solve It!
Medium
15
Rook
Very easy
16
Coordinates
Very easy
17
Sleepy Sasha is Trouble at the University
Very easy
18
Bohdan against "tails"
Easy
19
Pasha is also against "tails"?
Easy
20
Anton buys a piglet
Hard