categories: Algorithms ... Problems Nim 1 Random Nim Generator And Closure Little Pony and Elements of Harmony 2 See also Fast Fourier transform External links Fast Fourier Transform and variations of it Fast Fourier Transform and variations of it Footnotes https://apps.topcoder.com/wiki/display/tc/SRM+518 ↩ http://codeforces.com/blog/entry/13190 ↩