对这个编码译码器的要求是：打开一片英文文章，能统计该文章中每个字符出现的次数，然后以他们作为权值，对每一个字符进行编码，编码完成后再对其编码进行译码。 -Codec for this request is: Open an English article, to statistics of the article appears in the frequency of each character, and then their value as a right, for each encode