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the Mobius function

Revision en1, by Tsarist_Russia, 2020-04-12 12:26:44

hello codeforces. some days ago i meet great problem — 1285F - Classical?. in this task we need to use the Mobius function. so. for me it was something new and interesting. could u give me some task, were i can also use that trick?

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en1 English Tsarist_Russia 2020-04-12 12:26:44 253 Initial revision (published)