#includeIn this example, we create a TStopwatch object and call the `Start` method to begin timing. We then execute some code to measure, and call the `Stop` method to end the timing. Finally, we retrieve the elapsed time in seconds using the `RealTime` method and print it to the console. The `TStopwatch` class is part of the ROOT framework, which is a data analysis framework used in high-energy physics experiments.#include int main() { TStopwatch stopwatch; stopwatch.Start(); // some code to measure stopwatch.Stop(); std::cout << "Elapsed time: " << stopwatch.RealTime() << " seconds" << std::endl; return 0; }