fix

Author: atksh

cpp/main.cc

@@ -7,7 +7,7 @@ namespace py = pybind11;
 
 using T = int64_t; // is a temporary type of template. You can change it and
                    // recompile this.
-const int B = 6;   // the number of children of tree.
+const int B = 2;   // the number of children of tree.
 
 PYBIND11_MODULE(PRTree, m)
 {

cpp/prtree.h

@@ -645,12 +645,12 @@ class PRTreeElement
     is_used = true;
   }
 
-  bool operator()(const BB<D> &target) { return mbb(target); }
+  bool operator()(const BB<D> &target) { return is_used && mbb(target); }
 
   template <class Archive>
   void serialize(Archive &archive)
   {
-    archive(mbb, leaf);
+    archive(mbb, leaf, is_used);
   }
 };