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Cod sursa(job #466075)
#include<cstring>
#include<fstream>
using namespace std;
char n[20];
long long p, np[1 << 18][20]; // numarul de posibilitati luand configuratia 'i', sa am restul 0
int main()
{
ifstream fin("ratphu.in");
ofstream fout("ratphu.out");
fin >> n >> p;
int s = strlen(n);
//PD
np[0][0] = 1;
for (int i = 0; i < (1 << s); ++i)
for (int j = 0; j < p; ++j)
if (np[i][j])
for (int k = 0; k < s; ++k)
if ((i & (1 << k)) == 0)
np[i | (1 << k)][(j * 10 + n[k] - '0') % p] += np[i][j];
fout << np[(1 << s) - 1][0];
}