LeetCode 26, Easy. Topics: Array, Two Pointers. View on LeetCode.
Generate this problem as a practice environment: tested reference solution, 12 parametrized pytest cases, and a playground notebook:
Problem
Given an integer array nums sorted in non-decreasing order, remove the duplicates in-place such that each unique element appears only once. The relative order of the elements should be kept the same. Then return the number of unique elements in nums.
Consider the number of unique elements of nums to be k. To get accepted, you need to do the following things:
- Change the array
nums such that the first k elements of nums contain the unique elements in the order they were present in nums initially. The remaining elements of nums are not important as well as the size of nums.
- Return
k.
Examples
Constraints
1 <= nums.length <= 3 * 10^4
-100 <= nums[i] <= 100
nums is sorted in non-decreasing order.
Solution
Reference implementation from solution.py on GitHub, full suite in test_solution.py:
Complexity
NeetCode 250, NeetCode All. Last modified on September 7, 2026