Cod sursa(job #478245)

Utilizator freak93Adrian Budau freak93 Data 17 august 2010 21:31:01
Problema Ratphu Scor 100
Compilator cpp Status done
Runda Arhiva de probleme Marime 0.75 kb
#include<fstream>

using namespace std;

const char iname[]="ratphu.in";
const char oname[]="ratphu.out";
const int maxn=20;
const int maxp=(1<<maxn);

ifstream f(iname);
ofstream g(oname);

string s;
int p,n,i,j,r10[maxn],bonus,biti[maxp],k;
long long dp[maxp][maxn];

int main()
{
    f>>s>>p;
    n=s.size();
    dp[0][0]=1;
    r10[0]=1;
    for(i=1;i<=n;++i)
        r10[i]=(r10[i-1]*10)%p;
    for(i=0;i<(1<<n);++i)
    {
        biti[i]=biti[i>>1]+(i&1);
        for(j=0;j<n;++j)
            if((1<<j)&i);
            else
            {
                int bonus=(r10[biti[i]]*(s[j]-'0'))%p;
                for(k=0;k<=p;++k)
                    dp[i+(1<<j)][(k+bonus>=p)?(k+bonus-p):k+bonus]+=dp[i][k];
            }
    }
    g<<dp[(1<<n)-1][0]<<"\n";
}