/*
VIM: let b:cf5build="clang -std=c++20 -O2 -pthread -lstdc++ -I. {SRC} -o {OUT}"
VIM: let b:cf5run="{OUT}"
*/
#include <iostream>
#include <exception>
#include <chrono>
#include <set>

int main ( void )
{try{
    auto begin = std::chrono::high_resolution_clock::now();

    std::set<int> s({1, 2, 3, 4, 5});
    //......
    auto it = s.begin();
    for (int i = 0; i < 10; i++){
        std::cout << *it++ << ", " << std::endl;
    }
    std::cout << "-------" << std::endl;
    it = s.end();
    for (int i = 0; i < 10; i++){
        std::cout << *it-- << ", " << std::endl;
    }

    auto end = std::chrono::high_resolution_clock::now();
    std::chrono::duration<double> seconds = end - begin;
    std::cout << "Time: " << seconds.count() << std::endl;
    return 0;
}
catch ( const std::exception& e )
{
    std::cerr << std::endl
            << "std::exception(\"" << e.what() << "\")." << std::endl;
    return 2;
}
catch ( ... )
{
    std::cerr  << std::endl
            << "unknown exception." << std::endl;
    return 1;
}}