#include <iostream>
#include <algorithm>
#include <execution>

long long long_function(long long a) {
	for(int i=0; i<10000; i++) {
		a = (a * 123 +1)/125+2;
	}
	return a;
}

//parallel stl algoritms
int main() {
	std::vector<long long> a(1000000);
	for(unsigned int i=0; i<a.size(); i++) a[i]=i;

	std::cout<<"!!!!!!!!!!!\n";
	std::for_each(std::execution::par, a.begin(), a.end(), long_function);
	std::cout<<"!!!!!!!!!!!\n";
	std::for_each(std::execution::seq, a.begin(), a.end(), long_function);
	std::cout<<"!!!!!!!!!!!\n";
	return 0;
}