2015年10月4日
(中等) Hiho 1232 Couple Trees(15年北京网络赛F题)，主席树+树链剖分。
摘要： "Couple Trees" are two trees, a husband tree and a wife tree. They are named because they look like a couple leaning on each other. They share a sam... 阅读全文
posted @ 2015-10-04 23:47 WhyWhy。 阅读(255) 评论(0) 推荐(1) 编辑