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Problems

Combinatorics
Difficulty
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4343
Flags for Provinces
4441
Formation
Easy
4445
Peaceful Queens
Very easy
4449
Peaceful Queens - 2
Medium
4519
Sages
Hard
4594
Bims
Very easy
4644
Lotto
4836
Combinations 1
Very easy
4897
Polynomials
4901
"Peace"
Hard
4920
Lunar Code
Very hard
5092
Honeycomb
5101
Hodja Nasreddin
Very easy
5142
Number by permutation of letters
Medium
5239
Incorrect bracket sequences
Very hard
5312
B-trees
Very hard
5326
Towers of Hanoi
Very easy
5329
Party
Very easy
5385
Breakfast Sandwiches
Very easy
5435
Diplomas
Very easy
5439
Lyndon's Words
Easy
5453
"What? Where? When?"
Very hard
5482
Brackets
Hard
5615
Mundial
Medium
5675
Parallel Processes
Very hard
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