Fix c++ sample

samples/sample.cpp

@@ -50,9 +50,5 @@ int main(int argc, char** argv)
             cout << item << endl;
         }
     }
-    mdlp::indices_t indices = test.sortIndices(X[0]);
-    for (auto item : indices) {
-        cout << setw(3) << item << " " << X[0][item] << " " << y[item] << endl;
-    }
     return 0;
 }