摘要：
链接： https://codeforces.com/contest/1281/problem/D 题意： You are an all powerful being and you have created a rectangular world. In fact, your world is s 阅读全文
摘要：
链接： https://codeforces.com/contest/1281/problem/C 题意： outputstandard output We start with a string s consisting only of the digits 1, 2, or 3. The len 阅读全文
摘要：
链接： https://codeforces.com/contest/1281/problem/B 题意： Your friend Jeff Zebos has been trying to run his new online company, but it's not going very we 阅读全文