shnya/C++ split: copy, istream_iteartor, back_inserter version

## C++ split: copy, istream_iteartor, back_inserter version
vector<string> split(const string &str){
  istringstream iss(str); vector<string> res;
  copy(istream_iterator<string>(iss),  istream_iterator<string>(), back_inserter(res));
  return res;
}
	vector<string> split(const string &str){
	istringstream iss(str); vector<string> res;
	copy(istream_iterator<string>(iss), istream_iterator<string>(), back_inserter(res));
	return res;
	}