摘要: 题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=1853There are N cities in our country, and M one-way roads connecting them. Now Little Tom wants to mak... 阅读全文
posted @ 2015-03-13 00:05 huangxf 阅读(598) 评论(0) 推荐(0) 编辑