E. Beautiful Array · znzryb

## 思路讲解

一个小的脑筋急转弯

构造数组为 b b 3*a-2*b

无论3*a-2*b 的值是多少，b都是中位数

## AC代码

[https://codeforces.com/contest/2041/submission/293763683](https://codeforces.com/contest/2041/submission/293763683)

```cpp
#include <iostream>

using namespace std;
typedef long long ll;
ll a,b;

int main() {
	cin>>a>>b;
//	its mean is exactly a
//	and its median is exactly b
//  怎么做才能达到这样的效果那？
	cout<<3<<"\n";
	cout<<b<<" "<<b<<" "<<3*a-(2*b)<<endl;
}
// AC https://codeforces.com/contest/2041/submission/293763683
```

## 心路历程（WA，TLE，MLE……）