Two Pointers pattern
Remove Duplicates from Sorted Array
Given a sorted integer array, remove the duplicates in place so each value appears once, keeping the relative order. Return k, the number of distinct values; the first k slots of the array must hold them. Watch it run step by step, then write your own pseudocode and get it checked by AI.
- LeetCode 26
- Easy
- 2 approaches
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Two PointersLeetCode 26
Easy
From the first idea to the best one
- 01 Brute force · second array O(n)O(n) space
- 02 Optimized · write index O(n)O(1) space
What you will learn
- How to read Remove Duplicates from Sorted Array and spot the two pointers pattern in it
- Brute force · second array: O(n) time, O(n) space
- Optimized · write index: O(n) time, O(1) space
- The pseudocode for each approach, its line lit as the animation runs
- Practice: write your own pseudocode and get it checked
More Two Pointers
See Remove Duplicates from Sorted Array run, step by step
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DSA comes with the all labs plan and every ChaiCode batch.