#include <iostream>
#include <cstdlib>
#include <vector>
#include <iterator>     //for back_inserter and ostream_iterator
#include <functional>   //for not1
#include <algorithm>    //for remove_copy_if
using namespace std;

int main()
{
	const int a[] = {10, 30, 40, 20, 50};   //need not be sorted for remove_copy_if
	const size_t n = sizeof a / sizeof a[0];

	vector<int> v;
	remove_copy_if(a, a + n, back_inserter(v), bind2nd(greater<int>(), 30));
	copy(v.begin(), v.end(), ostream_iterator<int>(cout, "\n"));
	cout << "\n";

	remove_copy_if(
		a, a + n,
		ostream_iterator<int>(cout, "\n"),
		bind2nd(greater<int>(), 30)
	);

	return EXIT_SUCCESS;
}