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Simple oriented graph structure
G = (V, E) where G is graph, V set of vertices and E list of edges.
E = (tail, head) where tail and head are vertices
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Get list of vertices where a vertex is on the right side of an edge
c s g | ]}|d � kr|d �qS )r r r r! �r r r r A r z#Graph.get_tails.<locals>.<listcomp>�r )r
r r r& r � get_tails= s zGraph.get_tailsc s � fdd�| j D �S )zT
Get list of vertices where a vertex is on the left side of an edge
c s g | ]}|d � kr|d �qS r r r! �r r r r G r z#Graph.get_heads.<locals>.<listcomp>r' )r
r r r) r � get_headsC s zGraph.get_headsNc C sb |st t| j��}t� }t|g�}|r^|�� }||vr"|�|� |�t| j� |g ��| � q"|S )z
Breadth-first search traversal of the graph from `start` vertex.
Return a set of all visited vertices
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