void run1()
{
	size_t buffer_size = 1<<20;
	char *buffer = new char[buffer_size];
	string fileName;
	getline(cin,fileName);
	std::ifstream fin(fileName);

	while (fin)
	{
		// Try to read next chunk of data
		fin.read(buffer, buffer_size);
		// Get the number of bytes actually read
		size_t count = fin.gcount();
		// If nothing has been read, break
		cout << buffer;
		if (!count)
			break;
		// Do whatever you need with first count bytes in the buffer
		// ...
	}

	delete[] buffer;
}