Valid Palindrome
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What is Valid Palindrome?
Given a string, determine if it reads the same forward and backwards after removing non-alphanumeric characters and ignoring case. Two pointers start at each end and move inward, comparing characters as they go. This problem teaches you to use two pointers on a string and is a clean entry point for understanding how pointers can replace nested loops.
Free resources to learn Valid Palindrome
More in stage 5: Two Pointers
Valid Palindrome: common questions
Can I learn Valid Palindrome in Hindi?
This lesson is written in English. Once you sign in, open it in the interactive course and ask the AI tutor to explain Valid Palindrome in Hindi or Hinglish. The tutor answers from this lesson’s own text, so it stays on the syllabus, and it runs on your own Google, OpenAI or Anthropic key.
Is this Valid Palindrome tutorial for beginners?
It is lesson 20 of 137 in the free LeetCode roadmap, in stage 5, Two Pointers. If you are new to LeetCode, start from stage 1 and come back here in order; if you already know the earlier stages, this lesson stands on its own.