题目链接:https://www.acwing.com/problem/content/792/
数据范围
−10000≤n≤10000
输入样例:
1000.00
输出样例:
10.000000
代码实现:
#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
const int INF=0x3f3f3f3f;
const int MAXN=10000;
int main()
{
ios::sync_with_stdio(0);
cin.tie(0);cout.tie(0);
double x; cin >> x;
double l = - MAXN, r = MAXN;
while(r-l>1e-8){//注意要求保留6位小数的精度,就得使r-l>1e-8比较保险
double mid = (l + r) / 2;
if(mid * mid * mid >= x) r = mid;
else l = mid;
}
printf("%.6f\n",l);
return 0;
}