#include <iostream>
#include <chrono>
#include <thread>
 
int main() {
    auto start = std::chrono::high_resolution_clock::now();
 
    // Giả lập công việc với sleep 2 giây
    std::this_thread::sleep_for(std::chrono::seconds(2));
 
    auto end = std::chrono::high_resolution_clock::now();
 
    // Đo bằng nhiều đơn vị khác nhau
    auto ms = std::chrono::duration_cast<std::chrono::milliseconds>(end - start);
    auto us = std::chrono::duration_cast<std::chrono::microseconds>(end - start);
 
    std::cout << "Thời gian (milliseconds): " << ms.count() << "ms" << std::endl;
    std::cout << "Thời gian (microseconds): " << us.count() << "µs" << std::endl;
 
    return 0;
}

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NDU=

45