题目链接https://arc059.contest.atcoder.jp/tasks/arc059_d题目Problem StatementSig has built his own keyboard. Designed for ultimate simplicity, this keyboard only has $3$ keys on it: the 0 key, the 1 key ...
题目链接http://codeforces.com/contest/984/problem/E题目You work in a big office. It is a $9$ floor building with an elevator that can accommodate up to $4$ people. It is your responsibility to manage thi...