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3970
Mutants
Very easy
4031
Joint Venture
Easy
4034
Minimum and Maximum in a tree
Easy
4035
Ice-Cream
4036
Pre-Order Traversal of a Tree
Very easy
4038
Post-Order Traversal of a Tree
Very easy
4042
Median of Unions
Medium
4046
Mobile
Very hard
4073
Its a Murder!
Very easy
4117
Binary Search
Hard
4142
The Great XOR
Very easy
4147
Binary Search Tree 2
Medium
4150
Balance it!
Easy
4208
Degrees of two
Easy
4211
Gas stations
Very easy
4265
Secret Commands "Retreat"
Easy
4296
Counting 1`s
4360
Solarium for mushrooms
Very easy
4361
Solarium for mushrooms (Hard)
Very easy
4419
Dense forest
Very easy
4420
The root of a cubic equation
Very easy
4421
For Fans of Statistics
Easy
4422
Trains
Medium
4430
Points and Line Segments
Easy
4439
Exponentiation
Very easy
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