Two Pointers pattern
Rotate Array by K Places
Rotate an array to the right by k steps, in place. k may be larger than the length of the array. Watch it run step by step, then write your own pseudocode and get it checked by AI.
- LeetCode 189
- Medium
- 2 approaches
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Two PointersLeetCode 189
Medium
From the first idea to the best one
- 01 Brute force · rotate by one, k times O(n · k)O(1) space
- 02 Optimized · reverse three times O(n)O(1) space
What you will learn
- How to read Rotate Array by K Places and spot the two pointers pattern in it
- Brute force · rotate by one, k times: O(n · k) time, O(1) space
- Optimized · reverse three times: 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 Rotate Array by K Places run, step by step
Sign in and this page opens on the animation, with all 12 Two Pointers problems beside it.
DSA comes with the all labs plan and every ChaiCode batch.