太难辣，首AC居然是我

#include<bits/stdc++.h>
using namespace std;
double a,b,c;
int main(){
	cin>>a>>b>>c;
	double delta=b*b-4*a*c;
	if(delta==0){
		cout<<"x1=x2="<<fixed<<setprecision(5)<<(-1*b/(2*a));
	}
	else if(delta>0){
		double x1=((-1*b)+sqrt(b*b-4*a*c))/(2*a);
		double x2=((-1*b)-sqrt(b*b-4*a*c))/(2*a);
		cout<<"x1="<<fixed<<setprecision(5)<<min(x1,x2)<<';'<<"x2="<<fixed<<setprecision(5)<<max(x1,x2);
	}
	else cout<<"No answer!";
	return /*164*/0;
}