摘要: Hello world! First blog. $998244353$ $\sum\limits _{i=1}^n 2^i=2^{n+1}-1$ ~~I AK IOI~~ IOI AK me 阅读全文
posted @ 2023-01-17 20:44 No_Play_Yes_Splay 阅读(11) 评论(0) 推荐(0) 编辑