#include <iostream>
#include <vector>
#include <map>

using namespace std;

class Optimizer
{
public:
    Optimizer(int i): limit{i}, table{} {}
    Optimizer(): limit{0}, table{} {}

    void set_limit(int i)
    {
	limit = i;
    }

    void read(vector<long unsigned int> const& ids)
    {
	for ( long unsigned int id: ids )
	{
	    table[id] += 1;
	}
    }

    void print()
    {
	for ( auto line: table )
	{
	    if ( line.second >= limit )
	    {
		cout << "File " << line.first << ": " << line.second << '\n';
	    }
	}
	cout << endl;
    }
	
private:
    int limit;
    map<long unsigned int, int> table;
};

int main()
{
    Optimizer opt{2};
    vector<long unsigned int> file_ids1{1, 2, 1, 4, 128, 1, 2, 4};
    vector<long unsigned int> file_ids2{4, 1, 1, 4, 128, 128, 5, 1, 4};

    opt.read(file_ids1);
    opt.print();
    opt.set_limit(3);
    opt.print();
    opt.read(file_ids2);
    opt.set_limit(0);
    opt.print();
}