2017年12月19日
Codeforces Round #452 F. Letters Removing
摘要： Description Petya has a string of length n consisting of small and large English letters and digits. He performs m operations. Each operation is descr 阅读全文
posted @ 2017-12-19 13:11 PIPIBoss 阅读(183) 评论(1) 推荐(2) 编辑