![[old] Zigzag Array](https://dk1vwk12q8pjl.cloudfront.net/media/logos/task/middle/zigzag-array-disabled.png)
[old] Zigzag Array
This function creates an Array of arrays. that represents a two-dimensional grid with the given number of rows and cols. This grid should contain the integers from start
to start + rows * cols - 1
in ascending order, but the elements of every odd-numbered row have to be listed in descending order, so that when read in ascending order, the numbers zigzag through the two-dimensional grid.
Input: Two ints rows and cols. One optional argument start.
Output: Array of arrays.
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