How to wait time in c++?

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#include <iostream>
#include <unistd.h>

int main(int argc, char *argv[]) {
    std::cout << "Hello, lets wait 10 seconds!" << std::flush;
    // Wait 10 seconds
    sleep(10);
    std::cout << "Done! Thanks!";
    return 0;
}

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#include 
#include 
#include 

int main() {
    std::cout << "Before waiting" << std::endl;
    
    // Wait for 2 seconds
    std::this_thread::sleep_for(std::chrono::seconds(2));
    
    std::cout << "After waiting" << std::endl;
    
    return 0;
}