Zigzag Array
Your function should create a list of lists, that represents a two-dimensional grid with the given number of rows and cols.
This grid should contain integers (int) from start to start + rows * cols - 1 in ascending order, but the elements of every odd-index 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 integers (int) - rows and columns. One optional integer (int) - start.
Output: List of lists.
Examples:
assert create_zigzag(3, 5) == [[1,...
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