2020年2月6日
CF1272C
摘要： Recently, Norge found a string s=s1s2…sns=s1s2…sn consisting of nn lowercase Latin letters. As an exercise to improve his typing speed, he decided to 阅读全文
posted @ 2020-02-06 16:00 DeaL57 阅读(184) 评论(0) 推荐(0)