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Difficulty
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4897
Polynomials
Medium
4901
Secure PIN System Design
Hard
4902
Interval
Hard
4917
Farm 2
Very hard
4963
Flower-garden Designs
Very hard
4967
Vasya's Dad
Hard
5091
Explosive containers
Easy
5101
Hodja Nasreddin
Very easy
5128
The King`s Ups and Downs
Hard
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
5346
A Huge Tower
Medium
5385
Breakfast Sandwiches
Very easy
5415
Find the Outlier
Hard
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
5677
Build More Roads!
Medium
5703
Buy Your House
Hard
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