c++ execution time

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To measure the execution time of a C++ program, you can use the <chrono> library, which provides a high-resolution clock. Here are the steps to measure the execution time:

1. Include the <chrono> library: cpp #include <chrono>

2. Declare variables to store the start and end times: cpp std::chrono::high_resolution_clock::time_point start_time, end_time;

3. Set the start time before the code you want to measure: cpp start_time = std::chrono::high_resolution_clock::now();

4. Execute the code you want to measure.

5. Set the end time after the code execution: cpp end_time = std::chrono::high_resolution_clock::now();

6. Calculate the duration by subtracting the start time from the end time: cpp std::chrono::duration<double> duration = end_time - start_time;

7. Convert the duration to the desired time unit (e.g., seconds, milliseconds): cpp double duration_seconds = duration.count(); // in seconds double duration_milliseconds = duration.count() * 1000; // in milliseconds

By following these steps, you can accurately measure the execution time of your C++ program.