C++

$\color{#cc33ff}{— > 算法基础课题解}$

$\color{gold}{— > 蓝桥杯辅导课题解}$

思路：

浮点数二分

$\color{#ff00ff}{图解：}$

#include<iostream>
#include<algorithm>
#include<cstring>

using namespace std;

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

    double l = -10000, r = 10000;
    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;
}