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Cod sursa(job #28518)
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#define MOD 666013
int n,k,sol,ss,i,j,r,c;
int main()
{
freopen("kperm.in","r",stdin);
freopen("kperm.out","w",stdout);
scanf("%d%d",&n,&k);
if (k%2==0)
{
printf("0\n");
return 0;
}
c=n/k,r=n%k;
sol=1;
ss=1;
for (i=2;i<=r;i++)
ss=ss*i%MOD;
sol*=ss;
ss=1;
for (i=2;i<=k-r;i++)
ss=ss*i%MOD;
sol*=ss;
ss=1;
for (i=2;i<=c+1;i++)
ss=ss*i%MOD;
for (i=1;i<=r;i++)
sol=sol*ss%MOD;
ss=1;
for (i=2;i<=c;i++)
ss=ss*i%MOD;
for (i=1;i<=k-r;i++)
sol=sol*ss%MOD;
printf("%d\n",sol);
return 0;
}