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Problems

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Difficulty
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11455
K special cells
Medium
11488
Binomial Sum
Very easy
11512
IOI Selection
Very hard
11517
Task Gauss
Very hard
11518
Help for Bit
Very hard
11520
Digital tournament
Hard
11523
Sophisticated Device
Very hard
11524
Substring of a Palindrome
Very hard
11530
Superhero
Medium
11540
Story
Very hard
11541
Contest preparation
Medium
11550
x1+...+xk = n
Easy
11551
x1+...+xk = n (2)
Medium
11552
Arrangement
Medium
11602
Two Round Dances
Easy
11603
Bracket Sequences I
Medium
11615
Buildings
Medium
11661
Sum of Prime Numbers
Medium
11665
Chords
Medium
11679
Round table
Very easy
11691
Electrical switches
Very hard
11693
The Chess Board
Very easy
11706
Warm-up Equation
Medium
11715
Long-Awaited Party
Hard
11723
Combinations with repetitions
Easy
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