De Bruijn 序列生成

#include "stdafx.h"
#include <vector>
using namespace std;
static vector<char> alpha;

void seq_printer(unsigned int* a, unsigned int* a_end)
{
    for (unsigned int* i = a; i < a_end; ++i)
    {
        printf("%c", alpha[*i]);
    }
}
void debruijn(unsigned int t,
    unsigned int p,
    const unsigned int k,
    const unsigned int n,
    unsigned int* a)
{
    if (t > n) {
        // we want only necklaces, not pre-necklaces or Lyndon words
        if (n % p == 0) {
            seq_printer(a + 1, a + p + 1);
        }
    }
    else {
        a[t] = a[t - p];

        debruijn(t + 1, p, k, n, a);

        for (unsigned int j = a[t - p] + 1; j < k; ++j) {
            a[t] = j;
            debruijn(t + 1, t, k, n, a);
        }
    }
}

int _tmain(int argc, _TCHAR* argv[])
{

    alpha.push_back('0');
    alpha.push_back('1');
    //alpha.push_back('c');
    int N = 3;
    unsigned int* a = new unsigned int[N + 1];
    a[0] = 0;

    debruijn(1, 1, alpha.size(), N,a);
    if (N > 0) printf("%c", alpha[0]);

    delete[] a;
}