FInd a way to load less data from files

Loading data from files takes a lot of time (finding location, getting path right).

It would be good to reduce that.

One solution would be to reuse the same data in all exercises, so that it is loaded only once.

Another would be to provide some of it directly in template exercise files.

首先检查练习模板和现有的文件加载路径，以确定数据位于何处以及在哪里被重复加载。比较 issue 中提出的两种方法，并与 maintainer 确认预期范围。当练习需要重复定位文件的工作减少，并且共享数据的加载次数不超过必要程度时，即视为完成。

由索引模型根据 Issue 内容生成。