bugs again

instance_generator/InstanceGenerator.cpp

@@ -413,6 +413,7 @@ void InstanceGenerator::generate_shipments(
     destination_hub_id = st_network.get_vertices().at(arc.get_arrival_id()).get_id_in_graph();
     arrival_time = st_network.get_vertices().at(arc.get_arrival_id()).get_time();
     int last_vertex = arc.get_arrival_id();
+    assert(source_hub_id!=destination_hub_id);
 
     // Sample a path in the st_network starting at the (source hub,
     // departure_time)
@@ -447,18 +448,21 @@ void InstanceGenerator::generate_shipments(
       if (next_vertex.get_id_in_graph() != source_hub_id) {
           destination_hub_id = next_vertex.get_id_in_graph();
           arrival_time = next_vertex.get_time();
+          assert(source_hub_id!=destination_hub_id);
       }
       if (ElRandom::Bernoulli(prob_stop)) {
         break;
       }
     }
     number++;
+    assert(source_hub_id!=destination_hub_id);
     string destination_name = st_network.get_underlying_graph()
                                     .get_vertex(destination_hub_id)
                                     .get_name();
     string source_name = st_network.get_underlying_graph()
                                 .get_vertex(source_hub_id)
                                 .get_name();
+    assert(destination_name!=source_name);
     add_shipment(instance, number, source_name, destination_name,
                     departure_time, arrival_time, shipment_weights.at(k));