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Cod sursa(job #29077)
#include<fstream.h>
long i,j,st[5000],s,n,k,nr=0,suma[5000];
ofstream g("kperm.out");
/*void afisare()
{for(i=1;i<=n;i++)
g<<st[i]; g<<endl;
} */
int valid(int p)
{
if ((p>=k)&&(suma[p]-suma[p-k])%k!=0) return 0;
for(int i=1;i<p;i++)
if (st[i]==st[p]) return 0;
return 1;
}
void back(int p)
{int pval;
for(pval=n;pval>=1;pval--)
{st[p]=pval;suma[p]=suma[p-1]+pval;
if(valid(p))
if (p==n)
{nr=(nr+1)%666013;
// afisare();
}
else
back(p+1);
}
}
int main()
{
ifstream f("kperm.in");
f>>n>>k;
f.close();
suma[0]=0;
if(k%2==0||k==n||k==n-1) g<<"0\n";
else
{back(1);
//ofstream g("kperm.out");
g<<nr%666013<<"\n";
}
g.close();return 0;
}