code: public void addInputDeletions(VersionEdit edit)
      {
          for (FileMetaData input : levelInputs) {
              edit.deleteFile(level, input.getNumber());
          }
          for (FileMetaData input : levelUpInputs) {
              edit.deleteFile(level + 1, input.getNumber());
          }
      }
docs: Add all inputs to this compaction as delete operations to *edit.