Loading

摘要: CF1034E Little C Loves 3 III 子集卷积, \(len\le 2^{21},0\le a[i],b[i]\le 3,ans\%4\) 即对于 \(i\in[0,2^n-1]\) 求出 \[ (\sum_{j|k=i,j\&k=0}a[j]\times b[k])\mod 4 阅读全文
posted @ 2020-10-23 17:59 zzctommy 阅读(103) 评论(0) 推荐(0) 编辑