[Amazon] Maximal Minimum Value Path II

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Given a two 2D integer array, find the max score of a path from the upper left cell to bottom right cell that doesn't visit any of the cells twice. The score of a path is the minimum value in that path.

For example:



Here are some paths from [0,0] to [2,2] and the minimum value on each path:

path: 7->2->4->5->9, minimum value on this path: 2

path: 7->2->0->9->9, minimum value on this path: 0

path: 7->2->0->5->9, minimum value on this path: 0

Notice: the path can move all four directions. (not only right and down. ALL FOUR DIRECTIONS)

Here 7->2->0->5->3->9->9 is also a path, and the minimum value on this path is 0. 

The path doesn't visit the same cell twice. So 7->2->0->5->3->9->0->5->9 is not a path. 

In the end the max score(the min value) of all the paths is 3. 

Output: 3

Solve the problem:

def maxPathScore(matrix):

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