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Cod sursa(job #282272)
#include<fstream>
using namespace std;
int n,k,i,x,j,t,a[20000],b;
const int r=2000003;
int main()
{
ifstream f("sandokan.in");
ofstream g("sandokan.out");
f>>n>>k; for(i=1;i<=n;i++) f>>x;
n--;k--; j=n-k+1;
a[0]=1; a[1]=1;
for(t=0,b=n;b>=j;b--)
for(i=1;i<=a[0]||t;i++,t/=10)
a[i]=(t+=a[i]*b)%10;
a[0]=i-1;
for(t=0,b=1;b<=k;b++)
for(i=a[0];i>0;i--,t%=b)
a[i]=(t=t*10+a[i])/b;
for(;!a[a[0]]&&a[0]>1;a[0]--);
t=0;
for(i=a[0];i>0;i--)
t=(t*10+a[i])%r;
g<<t;
f.close();
g.close();
return 0;
}