int mpi_Gather(int* send_data, int send_count, MPI_Datatype send_datatype, int* recv_data, int recv_count, MPI_Datatype recv_datatype, int root, MPI_Comm communicator)
{
	int myid, numprocs;
	int* tmp = new int[send_count];
	MPI_Status status;
	MPI_Comm_rank(MPI_COMM_WORLD, &myid);
	MPI_Comm_size(MPI_COMM_WORLD, &numprocs);

	int index = 0;
	if (myid != root)
	{
		MPI_Send(send_data, send_count, MPI_INT, root, 99, MPI_COMM_WORLD);
	}
	else
	{
		for (int i = 0; i < send_count; i++)
		{
			recv_data[index] = send_data[i];
			index++;
		}
		for (int i = 1; i < numprocs; i++)
		{
			MPI_Recv(tmp, recv_count, MPI_INT, i, 99, MPI_COMM_WORLD, &status);
			for (int j = 0; j < send_count; j++)
			{
				recv_data[index] = *tmp;
				*(++tmp);
				index++;
			}
		}
	}
	return 0;
}