#include <vector>
#include <complex>
#include <iostream>
using namespace std;
#include <cmath>
#define M_PI 3.14159265358979323846
int main()
{
}
vector<complex<double>> FFT(vector<complex<double>>& samples)
{
int N = samples.size();
if (N == 1) return samples;
int M = N / 2;
vector<complex<double>> Xeven(M, 0);
vector<complex<double>> Xodd(M, 0);
for (int i = 0; i != M; i++)
{
Xeven[i] = samples[2 * i];
Xodd[i] = samples[2 * i + 1];
}
vector<complex<double>> Feven(M, 0);
Feven = FFT(Xeven);
vector<complex<double>> Fodd(M, 0);
Fodd = FFT(Xodd);
vector<complex<double>> freqbins(N, 0);
for (int k = 0; k != N / 2; k++)
{
complex<double> cmplxexponential = polar(1.0, -2 * M_PI * k / N)*Fodd[k];
freqbins[k] = Feven[k] + cmplxexponential;
freqbins[k + N / 2] = Feven[k] - cmplxexponential;
}
return freqbins;
}
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