gradinita

#include <fstream>
#include <string>
#define N 100001
using namespace std;
int P[N],a[N];

int sum(int n)
{
    int nr=0;
    string s=to_string(n);
    for(unsigned int i=0;i<s.size();i+=2)
        nr+=s[i]-'0';
    return nr;
}

int main()
{
	P[0]=P[1]=1;
	for(int i=2;i*i<=N;++i)
		if(P[i]==0)
			for(int j=2;i*j<=N;++j)
				P[i*j]=1;
    int n,k;
    ifstream f("gradinita.in");
    f>>n>>k;
    int x,L=0;
    while(n--)
    {
        f>>x;
        if(P[x]&&P[sum(x)])
                a[++L]=x;
    }
    f.close();
    ofstream g("gradinita.out");
    if(L)
    {
        for(int i=1;i<=L;++i)
            if(i%k)
                g<<a[i]<<' ';
        g<<'\n';
    }
    else
        g<<"Toti copiii sunt obraznici!";
    g.close();
    return 0;
}