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3669
Fifteen Puzzle
Very hard
3670
Polygon Game
Very hard
3671
Checking for a Subsequence
Very hard
3672
Divisors of 2
Easy
3673
Obtuse Angle Decomposition
Hard
3674
Accordion
Easy
3675
Chain
Very hard
3677
Matrix
Hard
3678
Mandatory vertices
Very hard
3679
Permutation logarithm
Hard
3680
Tree Isomorphism
Easy
3681
Filling the matrix in a spiral
Very easy
3682
Fire in the Country
Very easy
3683
Triangle and Circle
Very hard
3684
Report 1
Very hard
3685
Report 3
Very hard
3686
How many are good?
Medium
3687
Proto P
Very easy
3688
Simple coincidence
Hard
3689
Snake
Very hard
3690
Fingers
Easy
3691
Simple Monotony
Very easy
3692
Reverse Averaging
Very hard
3693
Determinant
Hard
3694
Exercise
Easy
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