feat: add solutions to lc problem: No.0961

[yanglbme]

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[Copilot]

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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