1
0
2
39
336
149
154
传送门:https://www.luogu.org/problemnew/show/P3803 #include #define N 2621450 #define pi acos(-1) using namespace std; typedef complex E; int n,m,l,r[N]; E a[N],b[N]; void FFT(E *a,int f){ for(int ...