A10430 | Infinite Sequence
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内存限制256MB
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题目描述
Vasya likes everything infinite. Now he is studying the properties of a sequence $s$ , such that its first element is equal to $a$ ( $s_{1}=a$ ), and the difference between any two neighbouring elements is equal to $c$ ( $s_{i}-s_{i-1}=c$ ). In particular, Vasya wonders if his favourite integer $b$ appears in this sequence, that is, there exists a positive integer $i$ , such that $s_{i}=b$ . Of course, you are the person he asks for a help.
输入格式
The first line of the input contain three integers $a$ , $b$ and $c$ ( $-10^{9}<=a,b,c<=10^{9}$ ) — the first element of the sequence, Vasya's favorite number and the difference between any two neighbouring elements of the sequence, respectively.
输出格式
If $b$ appears in the sequence $s$ print "YES" (without quotes), otherwise print "NO" (without quotes).
输入输出样例
输入 #1
1 7 3
输出 #1
YES
输入 #2
10 10 0
输出 #2
YES
输入 #3
1 -4 5
输出 #3
NO
输入 #4
0 60 50
输出 #4
NO
In the first sample, the sequence starts from integers $1$ , $4$ , $7$ , so $7$ is its element.
In the second sample, the favorite integer of Vasya is equal to the first element of the sequence.
In the third sample all elements of the sequence are greater than Vasya's favorite integer.
In the fourth sample, the sequence starts from $0$ , $50$ , $100$ , and all the following elements are greater than Vasya's favorite integer.
In the second sample, the favorite integer of Vasya is equal to the first element of the sequence.
In the third sample all elements of the sequence are greater than Vasya's favorite integer.
In the fourth sample, the sequence starts from $0$ , $50$ , $100$ , and all the following elements are greater than Vasya's favorite integer.
C++ 编辑器
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评测结果：Accepted