delete(parent.Out, cur)

		// Reconfigure every edge from the current node to now begin at the parent.
		for _, outEdge := range cur.Out {
			child := outEdge.Dest

			delete(child.In, cur)
			child.In[parent] = outEdge
			parent.Out[child] = outEdge

			outEdge.Src = parent
			outEdge.Residual = true
			// If the edge from the parent to the current node and the edge from the