简单代数 - 题目

#3721. 简单代数

统计

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给定函数 $f(x, y) = a x^2 + b xy + c y^2$，判断对于所有 $x, y \in \mathbb{R}$，是否都有 $f(x, y) \geq 0$ 成立。

输入格式

输入包含零个或多个测试用例，并以文件结束符（EOF）终止。

每个测试用例包含三个整数 $a, b, c$。

$-10 \leq a, b, c \leq 10$
测试用例数量不超过 $10^4$。

输出格式

对于每个测试用例，如果 $f(x, y) \geq 0$ 总是成立，则输出 "Yes"，否则输出 "No"。

样例

输入格式 1

1 -2 1
1 -2 0
0 0 0

输出格式 1

Yes
No
Yes

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