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3645
Tiling
Very easy
3646
Cost of removal
Easy
3647
Sea Voyage
Easy
3648
Sequence
Easy
3649
Disorder
Very easy
3650
How many different?
Very easy
3651
Digit-wise modulo 3
Very easy
3652
How many prefixes?
Very easy
3653
Ambiguity by Fibonacci
Very easy
3654
Without reciprocity
Very easy
3655
Pairs
Very easy
3656
Effectiveness of Permutations
Easy
3657
Elbow feeling
Very easy
3658
Multiplication of Polynomials
Very easy
3659
Maximum number
Easy
3661
Railway Tickets
Very easy
3662
Divisors of the number N! modulo
Easy
3663
Help system
Very easy
3664
Optimal Partition
Easy
3665
K-angulation
Very hard
3666
Balancing the Matrix
Very hard
3667
Lottery
Very hard
3668
Domino
Easy
3669
Fifteen Puzzle
Very hard
3670
Polygon Game
Very hard
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