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# (acm.sgu.ru) Count the number of circular black/white necklaces of length n. (babb is the same with bbab because the first necklace can be rotated to align with the second one)
Some math books useful for programming competition entusiasts:
Some math books useful for programming competition enthusiasts:
[1] Ioan Tomescu "Probleme de combinatorica si teoria grafurilor"
Every year during my highschool there was at least one problem in the national olympiad or in the IOI team selection tests from this book.
[2] Ioan Cuculescu "Olimpiadele Internationale de Matematica ale Elevilor"

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