【例】数的三次方根 - Problem Solution - lizikid

2

lizi12 LV 6 @ 2024-10-5 11:10:22


#include<bits/stdc++.h>
using namespace std;
int main()
{
	double x;
	cin>>x;
	double l=-1000,r=1000;
	while(r-l>1e-9)
	{
		double mid=(r+l)/2.0;
		if(mid*mid*mid<x)
		{
			l=mid;
		}
		else r=mid;
	}
	printf("%.6lf",r);
    return 0;
}

许皓辰 @ 2025-11-16 14:20:04

cout版本：

#include<bits/stdc++.h>
using namespace std;
double x;
double l=-1000,r=1000;
int main(){
	cin>>x;
	while(r-l>1e-9){
		double mid=(l+r)/2.0;
		if(mid*mid*mid<x){
			l=mid;
		}else{
			r=mid;
		}
	}
	cout<<fixed<<setprecision(6)<<r;

	return 0;
}

-2

白骏锋 LV 7 @ 2024-9-22 10:41:34

#include<bits/stdc++.h>
using namespace std;
int main()
{
	double x;
	cin>>x;
	double l=-1000,r=1000;
	while(r-l>1e-9)
	{
		double mid=(r+l)/2.0;
		if(mid*mid*mid<x)
		{
			l=mid;
		}
		else r=mid;
	}
	printf("%.6lf",r);
    return 0;
}

ID: 142
Time: 1000ms
Memory: 256MiB
Difficulty: 3
Tags: (None)
# Submissions: 70
Accepted: 28
Uploaded By: jike1994