Remove Duplicates from Sorted Array

https://leetcode.com/problems/remove-duplicates-from-sorted-array/

If a question mentions a specific property about the input data, often the optimal solution will make use of this property.

In this case, we are told that the array is sorted. That means our optimal solution must make use of the fact it is sorted.

Listen carefully to what your interviewer is telling you, every word might come in handy.

Question

Given a sorted array nums, remove the duplicates in-place such that each element appears only once and returns the new length.

Do not allocate extra space for another array, you must do this by modifying the input array in-place with O(1) extra memory.

Answer

counter = 0
# We use while loop to try and cut down on 2 loops
while counter < (len(nums) - 1):
    # if current counter is the same as the next one
    # remove current
    if nums[counter] == nums[counter + 1]:
        nums.remove(nums[counter])
    else:
        # else they are not the same, so counter +=1
        counter += 1
return len(nums)