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.


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


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



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

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