FFT NTT 错误总结(持续更新)
FFT NTT错误总结
1 处理\(r\)数组时忘记赋值
r[i] = (r[i >> 1] >> 1) | ((i & 1) << (l - 1));2 负数重载运算符
point operator * (point a,point b){
return point(a.x * b.x - a.y * b.y,a.x * b.y + a.y * b.x);
}3 欧拉公式记不清楚
point Wn = point(cos(Pi / mid),type * sin(Pi / mid));4 蝴蝶操作忘记*w
point x = A[j + k],y = w * A[j + mid + k]
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