摘要: link。 Denote \(cnt_{x}\) = the number of occurrences of \(x\), \(h\) = the maximum of \(a_i\), there we get \[ \sum_{1\leqslant i\leqslant n}\sum_{1\l 阅读全文
posted @ 2022-02-10 21:57 cirnovsky 阅读(56) 评论(0) 推荐(0)