#include <valarray>     
#include <cstdarg>
#include <iostream>
#include <iomanip>
 
std::valarray<std::size_t>  selection(std::size_t num, ... )
{
	va_list arguments; 
	std::valarray<std::size_t> sel(num);    
	va_start ( arguments, num );
	for ( std::size_t i = 0; i < num; i++ )
		sel[i] = va_arg ( arguments, int );
	va_end ( arguments );
	return sel;
 
}
 
int main ()
{
	std::valarray<int> array(30);
	array[selection(3, 9,5,14)] = 1;
	array[selection(4, 8,15,13, 12)] = 2;
 
	for (std::size_t i = 0, end = array.size(); i < end; ++i)
		std::cout << std::setw(2) << i << ',';
 
	std::cout << '\n';
 
	for (auto v : array)
		std::cout << std::setw(2) << v << ',';
 
	return 0;
}

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