PROGRAMMING:My sister can't be so annoying
As a student bully, ly is busy with all kinds of dating, but his 12-year-old sister garden has been asking him how to judge whether the system of quadratic equations with one variable (AX ^ 2 + BX + C) has real roots. For the sake of his life, please help him write a program to solve this problem.
###Input format:
The values of a, B and C are all in the range of int.
###Output format:
If there is a real root, output "yes", otherwise output "no".
###Input example:
Here is a set of inputs. For example:
```in
1 2 1
```
###Output example:
The corresponding output is given here. For example:
```out
Yes
```
answer：If there is no answer, please comment
###Input format:
The values of a, B and C are all in the range of int.
###Output format:
If there is a real root, output "yes", otherwise output "no".
###Input example:
Here is a set of inputs. For example:
```in
1 2 1
```
###Output example:
The corresponding output is given here. For example:
```out
Yes
```
answer：If there is no answer, please comment