Cod sursa(job #197733)
Utilizator | Data | 5 iulie 2008 17:13:58 | |
---|---|---|---|
Problema | Grigo | Scor | 10 |
Compilator | cpp | Status | done |
Runda | Arhiva de probleme | Marime | 0.48 kb |
#include<cstdio>
using namespace std;
long i,j,n,m,im[100003],x,xm,sol[100003];
int main()
{ freopen("grigo.in","r",stdin);
freopen("grigo.out","w",stdout);
scanf("%ld%ld",&n,&m);
for(i=1;i<=m;i++)
{ scanf("%ld",&x);
im[x]=1;
}sol[0]=1;
for(i=1;i<=n;i++)
{ if(!im[i])sol[i]=sol[i-1]*(i-1);
else sol[i]=sol[i-1];
}
printf("%ld",sol[n]);
return 0;
}