摘要: 题面 Description Give you two arrays $A[0..2^m 1]$ and $B[0..2^m 1]$. Please calculate array $C[0..2^m 1]$: $$ C[k]=\sum_{i~and~j=k}A[i~xor~j] B[i~or~j] 阅读全文
posted @ 2020-01-29 22:45 Artoriax 阅读(118) 评论(0) 推荐(0) 编辑