推广链接软件_初创公司网站设计苏州_会员营销_百度指数的使用方法

题目：

题解：

class Solution {
private:mt19937 gen{random_device{}()};uniform_real_distribution<double> dis;double xc, yc, r;public:Solution(double radius, double x_center, double y_center): dis(0, 1), xc(x_center), yc(y_center), r(radius) {}vector<double> randPoint() {double u = dis(gen), theta = dis(gen) * 2 * acos(-1.0);double r = sqrt(u);return {xc + r * cos(theta) * this->r, yc + r * sin(theta) * this->r};}
};