On this Saturday I'm giving a lecture on Fast Fourier Transform on Moscow International Workshop ACM ICPC. Due to this I wrote lecture notes which anybody can use as reference for Fast Fourier Transform. I added there almost anything one should need while using FFT in contests. Even if you suppose you know the algorithm I dare you to look this paper through since there still can be some new ideas for you. Also you can see Russian version here.
link can you please tell implementation of this polynomial division question. I know it's answer on paper. But I am unable to implement it. Thanks in advance.