用二叉排序树对文本文件单词处理与统计：去重、排序和位置信息输出

A good book is often the best urn of a life enshrining the best that life could think out; for the world of a man’s life is, for the most part, but the world of his thoughts. Thus the best books are treasuries of good words, the golden thoughts, which, remembered and cherished, become our constant companions and comforters.