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Problems

Combinatorics
Difficulty
Sort by
5716
Card houses
Very easy
5742
Candy`s Candy
Very hard
5758
Binary Polynomials
5774
Ostrich Passions
Very hard
5804
Board game
Hard
5821
Balloons
Very hard
5841
Pipeline Plans
Easy
5885
Lunar Code 2
5911
Palindrome row
Easy
5937
Knights
Very hard
5940
Palindrome Row (Hard)
Medium
5979
What word?
Easy
5980
How to plant?
Very hard
6086
"Same quantity, sum and product"
Easy
6162
Fox Observation
6309
Hyperia
Easy
6394
Powers of Pascal
6425
Incognito
6439
Counting Amusing Numbers
Medium
6452
Patterns
Very easy
6585
Eleven
Very easy
6655
Xenospeak
6847
Lego Land
Hard
6947
Boxes
7030
Painting
Hard
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