在#盖世猪猪#的解法上增加一个判断

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 input_old=in.nextDouble();
        double input=input_old>0?input_old:-input_old;
        double top=0;
        double bottom=0;
        while(top*top*top<input){
            top++;
        }
        bottom=top-1;
        double mid=bottom+(top-bottom)/2;
        double mul=mid*mid*mid;
        while(top-bottom>0.1){
            if(mul>input){
                top=mid;
            }else if(mul<input){
                bottom=mid;
            }else{
                break;
            }
            mid=bottom+(top-bottom)/2;
            mul=mid*mid*mid;
        }
        if(input_old<0){
            mid=-mid;
        }
        System.out.println(String.format("%.1f",mid));
    }
}