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feat: Enhance algorithms with bug fixes, new implementations, and comprehensive testing #6582
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...nsive tests ## Algorithm Fixes - **PancakeSort**: Fixed incorrect sorting logic and algorithm flow - Corrected the main loop to work from largest to smallest elements - Fixed findMaxIndex to search within correct bounds - Added comprehensive documentation and complexity analysis ## New Algorithm Implementations - **StringRadixSort**: Complete MSD Radix Sort for strings - Efficient O(d*(n+k)) time complexity implementation - Handles variable-length strings and Unicode characters - Includes both copy and in-place sorting methods - Comprehensive error handling and edge case support - **ExtendedEuclideanAlgorithm**: Full-featured extended GCD implementation - Both recursive and iterative implementations - Modular multiplicative inverse calculation - Linear Diophantine equation solver - Comprehensive documentation with mathematical background ## Enhanced Data Structures - **FenwickTree**: Major enhancement with comprehensive API - Added range queries, get/set operations, and input validation - Enhanced documentation with complexity analysis - Better error handling and edge case support - Added constructor for building from existing arrays ## New Comprehensive Test Suites - **StringRadixSortTest**: 15+ test methods covering all edge cases - **ExtendedEuclideanAlgorithmTest**: 20+ test methods with mathematical verification - **FenwickTreeTest**: 15+ test methods with boundary and performance testing ## Code Quality Improvements - Enhanced JavaDoc documentation with examples and complexity analysis - Added proper error handling and input validation - Improved code comments and algorithm explanations - Added mathematical verification in tests All implementations follow project coding standards and include: - Comprehensive unit tests with edge cases - Detailed documentation and examples - Performance complexity analysis - Error handling and input validation
- Detailed explanation of all algorithm enhancements - Clear before/after comparisons for fixes - Feature lists for new implementations - Test coverage documentation - Code quality standards followed - Usage examples for new algorithms
@adityashirsatrao007
adityashirsatrao007
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DenizAltunkapan,
yanglbme and
alxkm
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October 1, 2025 19:15
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🚀 Comprehensive Algorithm Enhancement Contribution
Overview
This PR introduces significant improvements to the Java algorithms repository through bug fixes, new algorithm implementations, enhanced data structures, and comprehensive testing coverage.
🐛 Bug Fixes
findMaxIndexmethod that were causing incorrect sorting behavior🆕 New Algorithm Implementations
1. StringRadixSort
src/main/java/com/thealgorithms/sorts/StringRadixSort.java2. ExtendedEuclideanAlgorithm
src/main/java/com/thealgorithms/maths/ExtendedEuclideanAlgorithm.java🔧 Enhanced Data Structures
FenwickTree Enhancement
src/main/java/com/thealgorithms/datastructures/trees/FenwickTree.javaget()method for element access🧪 Testing Excellence
📚 Documentation
CONTRIBUTION_SUMMARY.md🔍 Code Quality
📊 Impact
🎯 Benefits to Repository
📋 Checklist
📖 Additional Notes
This contribution demonstrates a commitment to code quality, comprehensive testing, and professional documentation standards. All changes are backward-compatible and enhance the repository's value for educational and practical use.
For detailed technical information about each change, please see
CONTRIBUTION_SUMMARY.mdin the repository root.