题解 | #求解立方根#

import java.util.Scanner;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        // 注意 hasNext 和 hasNextLine 的区别
        // while (in.hasNextInt()) { // 注意 while 处理多个 case
        //     int a = in.nextInt();
        //     int b = in.nextInt();
        //     System.out.println(a + b);
        // }
        double d = in.nextDouble();
        double xi = d;
        double xj = (2 * xi + d / (xi * xi)) / 3;
        double dif = xi >= xj ? xi - xj : xj - xi;

        while (dif > 0.1) {
            xi = xj;
            xj = (2 * xi + d / (xi * xi)) / 3;
            dif = xi >= xj ? xi - xj : xj - xi;
        }
        System.out.printf("%.1f", xj);
        
    }
}