2018年4月3日
hdu1394
摘要： The inversion number of a given number sequence a1, a2, ..., an is the number of pairs (ai, aj) that satisfy i < j and ai > aj.For a given sequence of 阅读全文
posted @ 2018-04-03 19:41 谁知道你啊啊啊 阅读(185) 评论(0) 推荐(0) 编辑