leetcode: 26. Remove Duplicates from Sorted Array

# Given a sorted array, 
# remove the duplicates in place such that each element appear only once 
# and return the new length.
#
# Do not allocate extra space for another array, 
# you must do this in place with constant memory.
#
# For example,
# Given input array nums = [1,1,2],
#
# Your function should return length = 2, 
# with the first two elements of nums being 1 and 2 respectively.
# It doesn't matter what you leave beyond the new length.

class Solution():
    def removeDuplicates(self, x):
        if len(x) < 1:
            return len(x)
        cur = 1
        for _ in range(1, len(x)):
            if x[cur] == x[cur - 1]:
                del x[cur]
            else:
                cur += 1
        return cur


if __name__ == "__main__":
    assert Solution().removeDuplicates([1, 1, 2, 3, 5, 5]) == 4
    assert Solution().removeDuplicates([]) == 0