
ZOJ Problem Set  2091
Given N numbers in a line, we can determine a continuous subsequence by giving its start position and its length. PMH and Roy played a game the other day. Roy gives the start position first, then PMH gives the length. Roy wants the mean of the subsequence as large as possible, while PMH wants it as small as possible. You are to calculate the best result Roy can get, assuming PMH is very clever.
Author: SHI, Xiaohan Source: ZOJ Monthly, March 2004 