$\huge \color{orange}{成仙之路->}$ $\huge \color{purple}{算法基础课题解}$

完整代码

#include<bits/stdc++.h>

using namespace std;

int main()
{
    double x;
    cin>>x;

    double l=-22,r=22;
    while(r-l>1e-7)
    {
        double mid=(l+r)/2;
        if(mid*mid*mid<=x) l=mid;
        else r=mid;
    }

    printf("%lf\n",l);

    return 0;
}