统计程序执行时间
auto now = std::chrono::steady_clock::now();
using duration_type = std::chrono::duration<double>;
...
auto now2 = std::chrono::steady_clock::now();
duration_type time_span = std::chrono::duration_cast<duration_type>(now2 - now);
std::out << "time elapsed " << time_span.count();
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