701. Random Connected Area

Consider a rectangle made up of W×H square cells each with area 1.
Each cell is independently coloured black with probability 0.5 otherwise white. Black cells sharing an edge are assumed to be connected.
Consider the maximum area of connected cells.

Define E(W,H) to be the expected value of this maximum area. For example, E(2,2)=1.875, as illustrated below.

You are also given E(4,4)=5.76487732, rounded to 8 decimal places.

Find E(7,7), rounded to 8 decimal places.

701. 随机连通块的面积

考虑一个由 WH 列的单位正方形方格构成的矩形网格。
每个方格独立地以 0.5 的概率被染黑,未染黑的方格均是白的。若两个黑色方格共享一条边,则认为它们连通。

考察连通黑色方格的最大面积,我们记 E(W,H) 为该最大面积的期望。例如,根据下图所述,可得 E(2,2)=1.875

你亦已知 E(4,4) 四舍五入至小数点后第 8 位后的值为 5.76487732

E(7,7) 四舍五入至小数点后第 8 位后的值。


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