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feat: add solutions to lc problem: No.0961 #4879
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Dec 5, 2025
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Pull request overview
This PR adds complete solutions for LeetCode problem #961 "N-Repeated Element in Size 2N Array", implementing two different algorithmic approaches across multiple programming languages.
Key Changes:
- Added two solution approaches: Hash Table (O(n) time, O(n) space) and Mathematical (O(n) time, O(1) space)
- Implemented solutions in 6 programming languages: Python, Java, C++, Go, TypeScript, and JavaScript
- Provided comprehensive documentation in both Chinese and English
Reviewed changes
Copilot reviewed 8 out of 8 changed files in this pull request and generated no comments.
Show a summary per file
| File | Description |
|---|---|
| README.md | Chinese documentation explaining the problem, constraints, and two solution approaches with complexity analysis |
| README_EN.md | English version of the problem documentation with identical structure and explanations |
| Solution.py | Hash table implementation in Python using set to track seen elements |
| Solution.java | Hash table implementation in Java with optimized HashSet initialization |
| Solution.cpp | Hash table implementation in C++ using unordered_set |
| Solution.go | Hash table implementation in Go using map as set |
| Solution.ts | Hash table implementation in TypeScript with explicit Set type |
| Solution.js | Hash table implementation in JavaScript with JSDoc comments |
| Solution2.py | Mathematical approach in Python comparing elements with gap of 1-2 positions |
| Solution2.java | Mathematical approach in Java with same comparison logic |
| Solution2.cpp | Mathematical approach in C++ optimized for constant space |
| Solution2.go | Mathematical approach in Go with idiomatic syntax |
| Solution2.ts | Mathematical approach in TypeScript with proper type annotations |
| Solution2.js | Mathematical approach in JavaScript with JSDoc documentation |
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