change some questions

src/QuestionGenerator.java

@@ -25,7 +25,7 @@ public abstract class QuestionGenerator {
   }
 
   protected int generateOperatorCount_one() {
-    return random.nextInt(4) + 2; // 1-5个操作符
+    return random.nextInt(4) + 2; // 2-5个操作符
   }
 
   // 检查题目是否重复
@@ -46,9 +46,9 @@ public abstract class QuestionGenerator {
     return currentType;
   }
 
-  // 设置当前类型
-  public void setCurrentType(String type) {
-    this.currentType = type;
-    this.generatedQuestions.clear(); // 切换类型时清空已生成题目
-  }
+//  // 设置当前类型
+//  public void setCurrentType(String type) {
+//    this.currentType = type;
+//    this.generatedQuestions.clear(); // 切换类型时清空已生成题目
+//  }
 }