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Problems

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Difficulty
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3671
Checking for a Subsequence
Very hard
3672
Divisors of 2
Easy
3673
Obtuse Angle Decomposition
3674
Accordion
Easy
3675
Chain
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
3685
Report 3
3686
How many are good?
3687
Proto P
Very easy
3688
Simple coincidence
3689
Snake
Very hard
3690
Fingers
Easy
3691
Simple Monotony
Very easy
3692
Reverse Averaging
Very hard
3693
Determinant
Hard
3694
Exercise
Easy
3695
Sequence Reconstruction
Easy
3696
Planet
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