Used std::arr<T>.end() instead of adding n to the .begin() iterator

Bounding_volumes/examples/Min_circle_2/min_circle_2.cpp

@@ -21,7 +21,7 @@ main( int, char**)
       P.at(i) = Point(r.get_double(), r.get_double());
     }
 
-    Min_circle  mc( P.begin(), P.begin() + n);
+    Min_circle  mc( P.begin(), P.end());
 
     Min_circle::Cartesian_const_iterator ccib = mc.center_cartesian_begin(), ccie = mc.center_cartesian_end();
     std::cout << "center:";

Bounding_volumes/examples/Min_circle_2/min_circle_homogeneous_2.cpp

@@ -23,8 +23,8 @@ main( int, char**)
     // (0,0), (-1,0), (2,0), (-3,0), ...
   }
 
-  Min_circle  mc1( P.begin(), P.begin() + n, false);    // very slow
-  Min_circle  mc2( P.begin(), P.begin() +n, true);     // fast
+  Min_circle  mc1( P.begin(), P.end(), false);    // very slow
+  Min_circle  mc2( P.begin(), P.end(), true);     // fast
 
   CGAL::IO::set_pretty_mode( std::cout);
   std::cout << mc2;