ACM竞赛题目的输入数据和输出数据一般有多组（不定），并且格式多种多样，有效处理题目的输入输出，是完成ACM竞赛题目的一项基本要求。这也是困扰初学者的一大问题。

-ACM contest topic of input data and output data are generally more than one set (variable), and a variety of formats, to deal effectively with the subject input and output, is an essential requirement for completion of the ACM contest topic. This is also troubled by a big problem for beginners.