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feat: add problem 125 valid palindrome #19

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@romankurnovskii romankurnovskii commented Aug 1, 2025 •
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Summary by Sourcery

Add a comprehensive markdown explanation for LeetCode problem 125 (Valid Palindrome) and implement the reference solution as a class-based two-pointer method with detailed inline comments and complexity analysis.

New Features:

  • Implement Solution.isPalindrome method using an in-place two-pointer approach to validate palindromes.

Enhancements:

  • Refactor explanation document for problem 125 to include difficulty, link, structured sections (description, examples, constraints, key observations, approach, walkthrough, and complexity).
  • Convert the standalone function into a Solution class method with clear comments and return logic.

Documentation:

  • Revise explanations/125/en.md with improved formatting, headings, examples, and a detailed solution strategy.

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sourcery-ai bot commented Aug 1, 2025 •
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Reviewer's Guide

This PR introduces LeetCode problem 125 by restructuring the problem explanation markdown for clarity and standardization, and refactors the Python solution into a class-based method with enhanced comments and simplified control flow.

Class diagram for the refactored palindrome solution

classDiagram
 class Solution {
 +isPalindrome(s: str) bool
 }
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File-Level Changes

Change Details Files
Revamped problem explanation markdown
  • Updated header to include Difficulty and Link metadata
  • Reorganized sections into Problem Description, Examples, Constraints, Explanation
  • Standardized example blocks and streamlined narrative into key observations
 explanations/125/en.md
Refactored Python solution implementation
  • Converted standalone function into Solution.isPalindrome method
  • Added inline comments for pointer initialization, character skipping, comparison, and return
  • Simplified loop logic by removing redundant checks and direct early returns
 solutions/125/01.py
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📥 Commits

Reviewing files that changed from the base of the PR and between 23a61e2 and 0715609.

📒 Files selected for processing (2)
  • explanations/125/en.md (1 hunks)
  • solutions/125/01.py (1 hunks)
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Hey @romankurnovskii - I've reviewed your changes and they look great!

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