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
        double a = Double.valueOf(in.nextLine());
        System.out.printf("%.1f",acc(a));
    }

    public static double acc(double num){
        double left, right, mid =0.0;
        right=Math.max(1.0, num);
        left=Math.min(-1.0, num);
        while(right-left > 0.001){
            mid = (left + right)/2;
            if(mid*mid*mid>num){
                right = mid;
            }
            else if(mid *mid*mid <num){
                left = mid;
            }else{
                return mid;
            }
        }
        return left;
    }
}