Score : $100$ points

问题描述

你已获得一个包含三个数字的序列：$A=(A_1,A_2,A_3)$。

是否可以重新排列$A$中的元素以构成一个等差序列？

换句话说，是否有可能重新排列$A$中的元素，使得$A_3-A_2=A_2-A_1$成立？

以上为通义千问 qwen-max 翻译，仅供参考。

Problem Statement

You are given a sequence of three numbers: $A=(A_1,A_2,A_3)$.

Is it possible to rearrange the elements of $A$ into an arithmetic sequence?

In other words, is it possible to rearrange the elements of $A$ so that $A_3-A_2=A_2-A_1$?

Constrains

• $1 \leq A_i \leq 100$
• All values in input are integers.

Input

Input is given from Standard Input in the following format:

$A_1$ $A_2$ $A_3$

Output

If it is possible to rearrange the elements of $A$ into an arithmetic sequence, print Yes; otherwise, print No.

Sample Input 1

5 1 3

Sample Output 1

Yes

We can rearrange them into an arithmetic sequence by, for example, making it $(1,3,5)$.

Sample Input 2

1 4 3

Sample Output 2

No

There is no way to rearrange them into an arithmetic sequence.

Sample Input 3

5 5 5

Sample Output 3

Yes

All elements of $A$ may be equal, or $A$ may be an arithmetic sequence already.

update @ 2024/3/10 09:12:38