Cod sursa(job #466025)

Utilizator Mishu91Andrei Misarca Mishu91 Data 25 iunie 2010 19:03:46
Problema Ratphu Scor 70
Compilator cpp Status done
Runda Arhiva de probleme Marime 0.91 kb
#include <fstream>

using namespace std;

const int MAX_P = 20;
const int MAX_N = (1 << 18);

ifstream fin ("ratphu.in");
ofstream fout ("ratphu.out");

long long N, R[MAX_N][MAX_P];
int P, Ncf;
char cif[MAX_P];

void trans(long long N) {
	for(; N; N /= 10) {
		cif[Ncf++] = N % 10;
	}
}

long long pow10(int x) {
	long long sol = 1, aux = 10;
	for(; x; x >>= 1) {
		if(x & 1) {
			sol *= aux;
		}
		aux *= aux;
	}

	return sol;
}

int main() {
	fin >> N >> P;
	trans(N);
	R[0][0] = 1;

	for(int conf = 1; conf < (1 << Ncf); ++conf) {
		int nr = 0;
		for(int i = 0; i < Ncf; ++i) {
			if(conf & (1 << i)) {
				++nr;
			}
		}

		for(int r = 0; r < P; ++r) {
			for(int i = 0; i < Ncf; ++i) {
				if(R[conf ^ (1 << i)][r] == 0) continue;
				if(conf & (1 << i)) {
					int actr = pow10(nr-1)*cif[i] % P;
					int newr = (actr + r) % P;
					R[conf][newr] += R[conf ^ (1 << i)][r];
				}
			}
		}
	}

	fout << R[(1 << Ncf)-1][0];
}