defFFT(A) # A-[a0,a1,...,an-1] n=len(A) if n==1: return A A0,A1=[a0,a2,...,an-2],[a1,a3,...,an-1] a=[0]*n for i inrange(n/2): a[i]=a0[i]+w*a1[i]; a[i+n/2]=a0[i]-w*a1[i] w=w*wn return a
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