摘要：```cpp include include define Maxn 1000500 const double Pi=acos( 1); using namespace std; int n,m,r[Maxn 1] 1)|((i&1)?n 1:0); fft(b,1); fft(c,1);//DFT 阅读全文

摘要：```cpp include include define Maxn 5000 define Pi 3.1415926535898 using namespace std; int n,m; struct complex {complex (double xx=0,double yy=0){x=xx 阅读全文