Two Pointers pattern
Valid Palindrome
Given a string, return true if it is a palindrome considering only alphanumeric characters and ignoring case. Watch it run step by step, then write your own pseudocode and get it checked by AI.
- LeetCode 125
- Easy
- 2 approaches
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Two PointersLeetCode 125
Easy
From the first idea to the best one
- 01 Brute · clean + reverse O(n)O(n) space
- 02 Optimized · two pointers O(n)O(1) space
What you will learn
- How to read Valid Palindrome and spot the two pointers pattern in it
- Brute · clean + reverse: O(n) time, O(n) space
- Optimized · two pointers: 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 Valid Palindrome 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.