Interplanetary Mission
The National Space Center(NSC) is planning an interplanetary mission in a new galaxy far far away fr...
I Hate Combinatorics!
Rick and Morty are being hunted by the galactic government. They ran away to the cell dimension. The...
Joker's GCD Test
Joker has a sequence P of n integers. Each two elements in the sequence are pairwise distinct. He de...
Pleasant Permutations
A sequence of n integers is called a permutation if it contains all integers from 1 to n exactly onc...
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