Description
Given function f(x,y)= ax^2 +bxy +cy^2, check if f(x,y)≥0 holds for all x,y ∈R.
Input
The input contains zero or more test cases and is terminated by end-of-file. Each test case contains three integers a,b,c. • −10≤ a,b,c ≤10 • The number of tests cases does not exceed 10^4.
Output
For each case, output “Yes” if f(x,y)≥0 always holds. Otherwise, output “No”.