优化（不确定）根据三级页面筛选单个节点bug

src/main/java/edu/nju/controller/HistoryController.java

@@ -308,10 +308,12 @@ public class HistoryController {
                     }
                 }
             }
+
+            hisservice.hotSortSingle(all);
+
             List<String> ids = all.subList(Integer.parseInt(start), Math.min(all.size(), Integer.parseInt(start) + Integer.parseInt(count)));
-            
+
             //根据热度排序，热度低的排在前面
-            hisservice.hotSortSingle(all);
 
 			List<String> invalid = hisservice.getInvalid(ids);
 			for(String id: invalid) {