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摘要: https://acm.ecnu.edu.cn/contest/448/problem/A/ \(a + k\sqrt b \Rightarrow (a+k\sqrt b) \cdot (A+K\sqrt b)= aA+kKb+(aK+kA)\sqrt b\) #include <bits/stdc 阅读全文
posted @ 2021-10-08 13:49 nekko 阅读(58) 评论(0) 推荐(0)
摘要: https://acm.ecnu.edu.cn/problem/3314/ 二项式展开得: \[ \begin{aligned} &\sum_{i=0}^{n}a_i(x+A)^i \\ =&\sum_{i=0}^{n}a_i\sum_{j=0}^{i}{i \choose j} x^jA^{i-j 阅读全文
posted @ 2021-10-08 09:21 nekko 阅读(225) 评论(0) 推荐(0)