LeetCode 9: Palindrome Number | Python Solution | Two-Pointer Technique
Determine if an integer is a palindrome without converting it to a string. A palindrome reads the same forwards and backwards. #palindrome #leetcode #python #coding-interview
⏱️ *Time Complexity:* O(log n) - We process each digit of the number once
🧠 *Space Complexity:* O(1) - Constant space used regardless of input size
📋 Timestamps
00:00 - Understanding problem statement
00:39 - Using string conversion
00:55 - Big O Notation explained
01:31 - Optimal solution
03:33 - Big O Notation explained
04:03 - Python code walk-through
04:51 - Solution analysis - runtime + memory
04:58 - Conclusion
🔑 Key Concepts
Palindrome verification
Two-pointer technique
Number manipulation
Handling edge cases
Mathematical approach vs string conversion
📚 Learning Points
How to check palindromes without string conversion
Efficient digit extraction and comparison
Handling negative numbers as edge cases
Techniques to reduce unnecessary computations
🔄 Related Problems
LeetCode 125: Valid Palindrome
LeetCode 234: Palindrome Linked List
LeetCode 5: Longest Palindromic Substring
LeetCode 680: Valid Palindrome II
👥 Target Audience
This video is ideal for coding interview candidates, computer science students, and software engineers looking to strengthen their problem-solving skills with fundamental algorithms.
📝 Prerequisites
Basic understanding of Python syntax
Familiarity with number manipulation
Understanding of time and space complexity
🔗 Useful Links
Problem statement: https://leetcode.com/problems/palindr...
Solution code: https://leetcode.com/problems/palindr...
💡 Additional Tips
Focus on the mathematical approach which is more efficient for interviews
Understand when to use modulo (%) and integer division (//)
Consider special cases like negative numbers and multiples of 10
🚀 Call to Action
If you found this solution helpful, please like and subscribe for more coding interview prep! Share your alternative approaches or questions in the comments below, and I'll respond to help you understand better!
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