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4000
Depth Search
Easy
4001
Area of the room
Easy
4002
Cheating away!
Very easy
4003
Sum of Left Leaves
Easy
4004
Is there a cycle?
Very easy
4005
The Game of Drunkard
Medium
4006
Delivery of kefir
Very easy
4007
Numbers
Very easy
4008
Binomial coefficients
Easy
4009
Bird tree
Medium
4010
Movie collection
Very easy
4011
Piece it together
Very easy
4012
Please, go first
Very easy
4013
Pool construction
Hard
4014
Smoking gun
Hard
4015
Tichu
Hard
4016
Tracking RFIDs
Medium
4017
Train delays
Medium
4018
Turtle
Very easy
4019
Turtle restoring
Medium
4020
Cult-orcs on the stairs
Very easy
4021
Knight move
Medium
4022
Admiral
Easy
4023
Group Pressure
Easy
4024
Cycling
Very hard
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