in resolution of [Wsign-compare] warning id 0
in resolution of [Wsign-compare] warning id 0

I looked a little into the context of how the variables 'last_node' and 'graph_info_->num_nodes()' are used. num_nodes() implies that the quantity returned is unsigned/non-negative, although the same assumption cannot be clearly made about last_node. 

I cast last_node to size_t under the assumption that it is being utilized as a size/non-negative quantity.
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