2020年5月26日
C. Similar Pairs
摘要： We call two numbers xx and yy similar if they have the same parity (the same remainder when divided by 22), or if |x−y|=1|x−y|=1. For example, in each 阅读全文
posted @ 2020-05-26 10:16 yin101 阅读(342) 评论(0) 推荐(0)
D. Buying Shovels
摘要： Polycarp wants to buy exactly nn shovels. The shop sells packages with shovels. The store has kk types of packages: the package of the ii-th type cons 阅读全文
posted @ 2020-05-26 10:14 yin101 阅读(332) 评论(0) 推荐(0)