message: Update seat-reservation-manager.cpp
diff: @@ -20,6 +20,7 @@ public:
  void unreserve(int seatNumber) {
  min_heap_.emplace_back(seatNumber); push_heap(begin(min_heap_), end(min_heap_), greater<>());
  }
  +
  private:
  vector<int> min_heap_;
  };
  