#include <iostream>
#include <chrono>

int main ( int argc, char* argv[] ) {

  auto time1 = std::chrono::system_clock::now();

  // 処理1

  auto time2 = std::chrono::system_clock::now();

  // 処理2
  
  auto time3 = std::chrono::system_clock::now();
  
  std::cout << "処理1" << std::endl;
  std::cout << std::chrono::duration_cast<std::chrono::nanoseconds>(time2 - time1).count() << std::endl;
  std::cout << "処理2" << std::endl;
  std::cout << std::chrono::duration_cast<std::chrono::nanoseconds>(time3 - time2).count() << std::endl;
  
  std::exit(0);

}