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  1. Trapping Rain Water II
    Given an m x n matrix of positive integers representing the height of each unit cell in a 2D elevation map, compute the volume of water it is able to trap after raining.
    Note:
    Both m and n are less than 110. The height of each unit cell is greater than 0 and is less than 20,000.
    Example:

    image

    Given the following 3x6 height map:
    [
    [1,4,3,1,3,2],
    [3,2,1,3,2,4],
    [2,3,3,2,3,1]
    ]
    Return 4.


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