题解 | #求解立方根#不管是平方根还是立方根，都是二分

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);
        double x = in.nextDouble();
        double l = -20;
        double r = 20;
        while(x - l*l*l>0.001){
            double mid = (l+r)/2;
            if(mid*mid*mid<x){
                l = mid;
            }else{
                r = mid;
            }
        }
        System.out.printf("%.1f",l);
    }
}