Remove Duplicates

Given a sorted list of numbers, remove duplicates and return the new length. You must do this in-place and without using extra memory. Input: `[0, 0, 1, 1, 1, 2, 2]` Your function should modify the list in place so the first 3 elements becomes `0, 1, 2`



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

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