elimin_prime

#include <fstream>
#include <cstring>
#define nmax 100000
using namespace std;
int v[nmax + 5],av[nmax + 5];
bool c[nmax + 5];
int main(int argc,const char * argv[])
{
    ifstream f("elimin_prime.in");
    ofstream g("elimin_prime.out");
    int n,i,na=0;
    f>>n;
    for(i=1;i<=n;++i)
        f>>v[i];
    for(i=2;i*i<=nmax;++i)
        if(!c[i])
            for(int j=i*i;j<=nmax;j+=i)
                c[j]=1;
    while(n)
    {
        memset(av,0,sizeof(av));
        na=0;
        for(i=1;i<=n;++i)
        {
            if(!c[i])
                g<<v[i]<<' ';
            else
                av[++na]=v[i];
        }
        memcpy(v,av,sizeof(av));
        n=na;
    }
    g<<'\n';
    return 0;
}