解析一个文件中的内容，以B tree的方式存储其中的国家，职位，人民，是一个基于B TREE的搜索算法实现。包括了源代码，原始文件以及搜索案例-Parse the contents of a file to B tree stored in a manner which the state, position, people, is a B TREE-based search algorithm. Including the source code, the original case file