Two Pointers: Slow and Fast Pointers

Move Zeros

Given an array of integers, move all the 0s to the back of the array while maintaining the relative order of the non-zero elements. Do this in-place using constant auxiliary space.

Input:

[1, 0, 2, 0, 0, 7]

Output:

[1, 2, 7, 0, 0, 0]

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  >>> a = [1, 2, 3]
  >>> a[-1]
  3

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