1541  Student’s question
Time Limit : 1 Second
Memory Limit : 128 MB
Submission: 787
Solved: 161
 Description
YYis a student. He is tired of calculating the quadratic equation. He wants you to help him to get the result of the quadratic equation. The quadratic equation’ format is as follows: ax^2+bx+c=0.
 Input
The first line contains a single positive integer N, indicating the number of datasets. The next N lines are n datasets. Every line contains three integers indicating integer numbers a,b,c (a≠0).
 Output
For every dataset you should output the result in a single line. If there are two same results, you should just output once. If there are two different results, you should output them separated by a space. Be sure the later is larger than the former. Output the result to 2 decimal places. If there is no solution, output “NO”.
 sample input

3 1 2 1 1 2 3 1 9 6
 sample output

1.00 NO 0.73 8.27
 hint
 source