摘要: 这个题正向建树比较困难,但是反向建树然后树里维护空格的个数就很简单.就是每次插入第几个空格就行了. 题干: Description Railway tickets were difficult to buy around the Lunar New Year in China, so we must 阅读全文
posted @ 2018-10-15 13:07 DukeLv 阅读(117) 评论(0) 推荐(0) 编辑