题目描述

实数二分模板题

C++ 代码

#include<cstdio>
#include<iostream>

using namespace std;

double n;
int main(){
    cin >> n;
    double l = -10000; double r = 10000;
    while(r - l > 1e-8){
        double mid = (l+r)/2;
        if(mid*mid*mid >= n) r = mid;
        else l = mid;
    }
    printf("%.6lf", l);

    return 0;
}