AcWing 790. 数的三次方根（实数二分）

题目链接：点击这里

#include<iostream>
#include<cstdio>
#include<algorithm>


using namespace std;

int main()
{
    double n;
    scanf("%lf", &n);
    if(n < 0)
    {
        printf("-");
        n = -n;
    }
    
    double l = 0, r = n;
    while(r - l > 1e-8)
    {
        double mid = (l + r) / 2;
        if(mid * mid * mid >= n)    r = mid;
        else    l = mid;
    }
    
    printf("%.6f\n", l);
    return 0;
}

来源：CSDN

作者：菜是原罪QAQ

链接：https://blog.csdn.net/qq_42815188/article/details/104636308