C. Meme Problem

Posted 2021-01-19 mch5201314

链接

[http://codeforces.com/contest/1076/problem/C]

题意

a+b=d and a?b=d. 计算出a和b

分析

ab=a(d-a)=d
aa-ad+d=0; 先判断再直接求根公式

代码

#include<bits/stdc++.h>
using namespace std;
int main(){
    int t,d;
    cin>>t;
    while(t--){
        cin>>d;
        if(d*d-4*d<0) cout<<"N
";
        else{
            cout<<"Y
";
            double a=(d*1.0-sqrt(d*d-4*d))/2.0,b=(d*1.0+sqrt(d*d-4*d))/2.0;
            printf("%.9f %.9f
",a,b);
        }
    }
    return 0;
}