Educational Codeforces Round 54 (Rated for Div. 2)

real numbers multiple

#include<iostream>
#include<cmath>
#include<iomanip>
#include<cstdio>
using namespace std;

int main()
{
    int n;
    cin>>n;
    while(n--)
    {
        int d;
        cin>>d;
        if(d==0)
        {
            cout<<"Y"<<" "<<0.000000000<<" "<<0.000000000<<endl;

            continue;
        }
        if(d<4)
        {
            cout<<"N"<<endl;
        }
        else
        {
            double a, b;
            a=(d+sqrt(d*d-4*d))/2;
            b=d-a;
            cout<<"Y "<<setiosflags(ios::fixed)<<setprecision(9)<<max(a, b)<<" "<<setprecision(9)<<min(a, b)<<endl;
            printf("Y %.9f %.9f\n",max(a, b), min(a, b));
        }
    }
    return 0;
}

just have a try