Problem F from CERC 15

Revision en1, by SureYeaah, 2017-12-18 17:39:34

I was trying to solve problem F from CERC 15. The problem was basically reduced to finding the sum . How can I find this sum in better than quadratic time without FFT?

Tags cumulative sum, generating function, cerc


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en1 English SureYeaah 2017-12-18 17:39:34 278 Initial revision (published)