摘要：
codeforces #274 C. Riding in a Lift dp+前缀和优化Imagine that you are in a building that has exactlynfloors. You can move between the floors in a lift. Le... 阅读全文
摘要：
codeforces#272 C. Dreamoon and Strings 字符串 dpDreamoon has a stringsand a pattern stringp. He first removes exactlyxcharacters fromsobtaining strings'a... 阅读全文