gistfile1.cpp

#include <fstream>
#include <iostream>
#include <unordered_set>
#include <boost/format.hpp>

typedef std::unordered_set<uint64_t> Set;

void load(Set& data, const std::string& filename)
{
    uint64_t current;
    std::ifstream file(filename);
    while(file >> current)
    {
        data.insert(current);
    }
}

int handle(const Set& data, std::istream& in, std::ostream& out)
{
    uint64_t current;
    while(in >> current)
    {
        const char* result = data.count(current) ? "1\n" : "0\n";
        out << result << std::flush;
    }
    return 0;
}

int main(int argc, char* argv[])
{
    try
    {
        assert(argc == 2);
        Set set;
        load(set, argv[1]);
        std::cerr << "Ready\n" << std::flush;
        return handle(set, std::cin, std::cout);
    }
    catch(const std::exception& e)
    {
        std::cerr << boost::format("Error: %1%") % e.what() << std::endl;
        return 1;
    }
}