#include <iostream>
#include <vector>
#include <execution>
#include <algorithm>
#include <random>

using namespace std ;


int main()
{
	const array<int, 3> arr1{ 1, 2, 4 };
	int result = reduce(cbegin(arr1), cend(arr1)); // == 6
	cout << "result:" << result << endl ;
	// Using a custom binary op:
	result = reduce(cbegin(arr1), cend(arr1), 1,
	multiplies<>{}); // == 8
    cout << "result:" << result << endl ;

 return 1 ;
}