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#include <chrono>
#include <iomanip>
#include <sstream>
std::string items_per_second(int N, double elapsed) {
double ips = N * 1000 / elapsed;
std::string postfix = "";
if (ips >= 1e8) {
ips /= 1e9;
postfix = "G";
} else if (ips >= 1e5) {
ips /= 1e6;
postfix = "M";
} else if (ips >= 1e2) {
ips /= 1e3;
postfix = "k";
}
std::ostringstream sout;
sout << std::setprecision(3) << ips << postfix << "(items/s)";
return sout.str();
}
double current_time() {
static auto start_time = std::chrono::system_clock::now().time_since_epoch();
auto now = std::chrono::system_clock::now().time_since_epoch() - start_time;
return std::chrono::duration_cast<std::chrono::microseconds>(now).count() / 1e3;
}
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