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Cod sursa(job #213397)
#include <fstream.h>
#include <iostream.h>
fstream f("grigo.in", ios::in);
fstream g("grigo.out", ios::out);
int v[100001];
int main ()
{
long m,n,i,j;
int x;
f>>n>>m;
for(i=1;i<=m;i++)
{
f>>x;
v[x]=1;
}
for(i=2;i<=n;i++)
{
if(v==0) v[i]=(v[i-1]*((i-1)%1000003))%1000003;
else v[i]=v[i-1];
}
g<<v[n];
f.close();
g.close();
return 0;
}