#include <iostream>
#include <iomanip>
#include <cmath>

int main() {
    int a, b, c;
    std::cin >> a >> b >> c;

    // 计算判别式
    int discriminant = b * b - 4 * a * c;

    if (discriminant >= 0) {
        // 计算两个解
        double x1 = ((double)(-b) - sqrt(discriminant)) / (2 * a);
        double x2 = ((double)(-b) + sqrt(discriminant)) / (2 * a);

        // 输出两个解，保留三位小数
        std::cout << std::fixed << std::setprecision(3) << std::min(x1, x2) << " " << std::max(x1, x2) << std::endl;
    } else {
        // 判别式小于 0，输出 error
        std::cout << "error" << std::endl;
    }

    return 0;
}

#include<bits/stdc++.h>
using namespace std;

int main(){
	int a,b,c,h;
	cin>>a>>b>>c;
	h=b*b-4*a*c;
	if (h<0) { cout<<"error";}
	else{
	if (h==0) {cout<<fixed<<setprecision(3)<<(-1*b*1.0/(2*a));}
	else{
		cout<<fixed<<setprecision(3)<<((-1*b-sqrt(h))*1.0/(2*a))<<" "<<((-1*b+sqrt(h))*1.0/(2*a));
	}
	}
	return 0;
}

V我50，私信答案

还想抄答案，自己写去

略