Garland
题意翻译
**问题描述**
有图
![](http://61.139.95.227:82/upload/image/20180704/20180704210608_97062.png)
并且满足:
H1 = A
Hi = (H[i−1] + H[i+1])/2 − 1,i∈(1,N)
HN = B
Hi ≥ 0,i∈[1,N]
(H即Height)
求给定最左边的A点和个数N,求最右边B点的最低值。
输入格式:两个数,分别表示N,A
整数N (3 ≤ N ≤ 1000),实数A (10 ≤ A ≤ 1000)
**Sample input**
692 532.81
**Sample Output**
446113.34
题目描述
[problemUrl]: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=448&page=show_problem&problem=4330
[PDF](https://uva.onlinejudge.org/external/15/p1555.pdf)