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Problems

Math
Difficulty
Sort by
9055
Secret code
Easy
9064
Old man and chessboard
Very easy
9081
Game cards
Easy
9082
Game "15++"
Easy
9083
Preparing for battle
Medium
9085
Circle inscribed in a square (roundinsquare)
Medium
9098
XOR sum
Medium
9107
Don’t Split The Atom!
9108
Bobby Tables
Medium
9111
Airport Check-in
9114
DotA Quals
9395
Number of Divisors (Function)
Very easy
9397
"Short Cube"
Hard
9406
Professor and batteries
9412
GeoGame
Easy
9423
Price function - 1
9438
Folding
Very easy
9506
Arithmetic magic
9518
Accurate Movement
Very easy
9519
Bad Treap
9521
Double Palindrome
Medium
9533
Starting number in the sequence
Easy
9538
Chocolate bar
Very easy
9542
Product of digits
Easy
9547
Factorial (function)
Medium
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