Use unordered_set

Signed-off-by: Aaron Chong <[email protected]>

rmf_fleet_adapter/src/rmf_fleet_adapter/TaskManager.cpp

@@ -923,23 +923,21 @@ void TaskManager::set_queue(
 
     // Cancel pending automatic tasks that will be removed from the new
     // assignments.
-    std::vector<std::string> new_automatic_task_ids;
+    std::unordered_set<std::string> new_automatic_task_ids;
     const std::vector<std::string> cancellation_labels =
     {"New task assignments received."};
     for (const auto& a : assignments)
     {
       if (a.request()->booking()->automatic())
       {
-        new_automatic_task_ids.push_back(a.request()->booking()->id());
+        new_automatic_task_ids.insert(a.request()->booking()->id());
       }
     }
     for (const auto& a : _queue)
     {
       if (a.request()->booking()->automatic() &&
-        std::find(
-          new_automatic_task_ids.begin(),
-          new_automatic_task_ids.end(),
-          a.request()->booking()->id()) == new_automatic_task_ids.end())
+        new_automatic_task_ids.find(a.request()->booking()->id()) ==
+        new_automatic_task_ids.end())
       {
         _publish_canceled_pending_task(a, cancellation_labels);
       }