ac不了

#include <iostream>
#include <cstdio>
#include <cstring>
#include <algorithm>
#include <string>
#include <vector>
#include <cmath>
using namespace std;

double f(double x)
{
	return pow(x,(double)1/2)+pow(x,(double)1/3);
}
//int roundx(double number) 
//{
//return (number>0.0)?(number+0.5):(number-0.5);
//}
double roundx(double number,int bits) //number->浮点数，bits->保留位数
{
	for(int i=0;i<bits;++i)
	{
		number*=10;
	}
	number=(long long)(number+0.5);
	for(int i=0;i<bits;++i)
	{
		number/=10;
	}
	return number;
}
double dao(int y,double l,double h)
{
	
	double mid=(l+h)/2;
	if(h-l>=10e-11)
	{
		//cout<<"h-l="<<h-l<<"  mid="<<mid<<"  f(mid)="<<f(mid)<<endl;
		if(f(mid)==y)
		{
			return mid;
		}
		if(f(mid)>y)
			return dao(y,l,mid);
		if(f(mid)<y)
			return dao(y,mid,h);
	}
	return mid;
}
int main()
{
	int n,y;
	cin>&...