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Cod sursa(job #466864)
//dinamica pe bitzisori
#include<stdio.h>
#define LL long long
LL elfus[1<<18][20];
int cifre[30];
int main()
{
LL N;
int p,i,j,k;
freopen("ratphu.in","r",stdin);
freopen("ratphu.out","w",stdout);
scanf("%lld%d",&N,&p);
do
{
cifre[++cifre[0]]=N%10;
N/=10;
}
while(N);
elfus[0][0]=1;
for(i=0;i<= 1<<cifre[0]; i++)
for(j=0;j<p;j++)
if(elfus[i][j])
for(k=0;k<=cifre[0];k++)
if(!(1<<k)&i) //masca de bitzisori
elfus[i+(1<<k)][(j*10+cifre[k])%p]+=elfus[i][j]; //recurenta.. tot pe bitzisori
printf("%lld",elfus[1<<cifre[0]][0]);
return 0;
}