C++ 代码

注意区间

# include <iostream>
using namespace std;
const int N = 1e4;
int main()
{
    double x;
    cin >> x;
    double l = -N, r = N;
    while(r - l > 1e-8)
    {
        double mid = (l + r) / 2;
        if (mid * mid * mid >= x) r = mid;
        else l = mid;
    }
    printf("%lf", l);
    return 0;
}