重庆市人民政府官网首页_兰州最新大事_百度应用商店官网_百度号码认证平台官网首页

题目：

题解：

class Solution {Random random;double xc, yc, r;public Solution(double radius, double x_center, double y_center) {random = new Random();xc = x_center;yc = y_center;r = radius;}public double[] randPoint() {double u = random.nextDouble();double theta = random.nextDouble() * 2 * Math.PI;double r = Math.sqrt(u);return new double[]{xc + r * Math.cos(theta) * this.r, yc + r * Math.sin(theta) * this.r};}
}