2018年12月21日
Sequence II HDU - 5919（主席树）
摘要： Mr. Frog has an integer sequence of length n, which can be denoted as a1,a2,⋯,ana1,a2,⋯,anThere are m queries. In the i-th query, you are given two in 阅读全文
posted @ 2018-12-21 00:23 Jiaaaaaaaqi 阅读(207) 评论(0) 推荐(0)