正解：继续颓废
by lqhsr @ 2019-03-14 20:48:45
这是虚数：
```cpp
struct comp
{
double a,b;
//ai+b;
comp(double _a=0.,double _b=0.)
{
a=_a;
b=_b;
}
comp operator+=(comp x)
{
a+=x.a;
b+=x.b;
return *this;
}
comp operator+(comp x)
{
comp xx=x;
return xx+=*this;
}
comp operator-=(comp x)
{
a-=x.a;
b-=x.b;
return *this;
}
comp operator-(comp x)
{
comp xx=x;
return xx-=*this;
}
comp operator*(comp x)
{
comp r;
r.a=a*x.b+b*x.a;
r.b=b*x.b-a*x.a;
return r;
}
comp operator*=(comp x)
{
return *this=*this*x;
}
};
```
by huhao @ 2019-03-14 20:49:42
我颓废到不会写A+B（迫真）
by 自闭头铁娃 @ 2019-03-14 20:52:58
真正的颓废在此
by ziiidan @ 2019-03-14 21:00:21
写Python。。。
by xiaolou @ 2019-03-14 21:01:23
亲，这边建议您写 NTT 呢，这样就不会有“不会写 FFT” 的现象了呢
by VenusM1nT @ 2019-03-14 21:55:58
~~继续颓~~
by Higashikata_Jousuke @ 2019-03-14 22:11:51