題目

https://leetcode.com/problems/generate-random-point-in-a-circle/

題解

class Solution {double r, x, y, xMin, xMax, yMin, yMax;Random rand;public Solution(double r, double x, double y) {rand = new Random();this.r = r;this.x = x;this.y = y;xMin = x - r;xMax = x + r;yMin = y - r;yMax = y + r;}public double[] randPoint() {double x0 = xMin + (xMax - xMin) * rand.nextDouble();double y0 = yMin + (yMax - yMin) * rand.nextDouble();while (Math.pow(x0 - x, 2) + Math.pow(y0 - y, 2) > Math.pow(r, 2)) {x0 = xMin + (xMax - xMin) * rand.nextDouble();y0 = yMin + (yMax - yMin) * rand.nextDouble();}return new double[]{x0, y0};} }/*** Your Solution object will be instantiated and called as such:* Solution obj = new Solution(radius, x_center, y_center);* double[] param_1 = obj.randPoint();*/

拓展：用概率求圓周率

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