Remove Duplicates from Sorted Array
Explore how to efficiently remove duplicate values from a sorted integer array by modifying it in-place. Understand the two-pointer method to retain only unique elements while maintaining order. You will learn to implement a solution that returns the number of unique elements without extra space.
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Statement
You are given an integer array nums that is already sorted in non-decreasing order. Your task is to remove the duplicate values in-place so that each element in the array appears only once, while preserving the original relative order of the elements.
After removing the duplicates, let k be the number of unique elements remaining in the array. The first k positions of nums should contain these unique elements in sorted order. Any values beyond index k - 1 are irrelevant and can be ignored.
Your goal is to modify the array in-place and return the value k, representing the count of unique elements.
Constraints:
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