2019年7月26日
杭电2019多校第一场，Problem I，String 2019
摘要： 题目描述 Tom has a string containing only lowercase letters. He wants to choose a subsequence of the string whose length is k and lexicographical order is 阅读全文
posted @ 2019-07-26 14:30 lglh 阅读(156) 评论(0) 推荐(0) 编辑