Cod sursa(job #2054277)

Utilizator mouse_wirelessMouse Wireless mouse_wireless Data 1 noiembrie 2017 20:41:55
Problema Ratphu Scor 100
Compilator cpp Status done
Runda Teme Pregatire ACM Unibuc 2014, Anul I, Semestrul 2 Marime 1.15 kb
#include <bits/stdc++.h>
using namespace std;
typedef long long LL;
#define mp make_pair
#define CHECK(x) if(!(x)) return false;

#ifdef INFOARENA
#define ProblemName "ratphu"
#endif

#define MCONCAT(A, B) A B
#ifdef ProblemName
#define InFile MCONCAT(ProblemName, ".in")
#define OuFile MCONCAT(ProblemName, ".out")
#else
#define InFile "fis.in"
#define OuFile "fis.out"
#endif

const int MAXN = 18;
const int MAXP = 20;

LL dp[1 << MAXN][MAXP];
int pw[MAXN];
char buf[MAXN];

int main() {
  assert(freopen(InFile, "r", stdin));
  assert(freopen(OuFile, "w", stdout));
  int N, P;
  scanf("%s%d", buf, &P);
  N = strlen(buf);
  pw[0] = 1 % P;
  for (int i = 1; i <= N; ++i)
    pw[i] = (pw[i - 1] * 10) % P;
  for (int i = 0; i < N; ++i)
    buf[i] -= '0';
  memset(dp, 0, sizeof dp);
  dp[0][0] = 1;
  int lim = (1 << N);
  for (int msk = 0; msk < lim; ++msk)
  for (int i = 0; i < N; ++i) {
    int bit = (1 << i);
    if (msk & bit)
      continue;
    int nmsk = msk | bit;
    for (int r = 0; r < P; ++r)
      dp[nmsk][((r * 10) + buf[i]) % P] += dp[msk][r];
  }
  printf("%lld\n", dp[lim - 1][0]);
  return 0;
}