w_1106的博客

1010.Reports Problem Description Because of Covid-19, Kanade needs to report every time when entering and leaving school. Now you want to check if Kanade’s reports on a certain day are correct. A sequence of reports is correct if and only if there does no

Express Mail Taking Problem Description Besides on the traditional classes,Baby Volcano also needs to learn how to take the express mails. Usually express mails are stored in cabinets. In Baby Volcano’s school,there are n cabinets in a row,numbered by 1 t