bug修复

src/main/java/com/project/exam/domain/service/impl/AssemblePaperDomainServiceImpl.java

@@ -113,9 +113,9 @@ public class AssemblePaperDomainServiceImpl implements AssemblePaperDomainServic
         // 获取任务配置
         TaskDTO taskDTO = taskBaseService.getById(taskId).toDTO(TaskDTO::new);
         // 最终选定题目
-        List<QuestionDTO> selectedQuestionList = new ArrayList<>();
+        List<QuestionDTO> selectedQuestionList = null;
-
         for (int attempt = 0; attempt < 5; attempt++) {
+            selectedQuestionList = new ArrayList<>();
             int totalQuestionNum = taskDTO.getSingleChoiceNum() + taskDTO.getMultipleChoiceNum() + taskDTO.getTrueFalseNum();
             // 权重乱序种子选取
             List<TaskKnowledgePointDTO> seedKpList = selectWeightedSeedKpList(taskDTO, totalQuestionNum);