多项式乘法题目链接#include <cstdio> #include <algorithm> #include <cmath> using namespace std; const double PI = acos(-1); const int N = 2e6; struct Complex { double r, i; Complex(double r = 0, double i = 0) {this->r = r; this->i = i;} Complex operator + (Complex- 阅读剩余部分 -