题解 | #求解立方根#

#include <iostream>
using namespace std;

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

    double l = -20, r = 20;
    while (r - l > 1e-3) {
        double mid = (l + r) / 2;
        if (mid * mid * mid >= a)
            r = mid;
        else
            l = mid;
    }
    printf("%.1lf\n", l);
    return 0;
}