feat: add solutions to lc problem: No.2110

[yanglbme]

No description provided.

[Copilot]

Pull request overview

This PR adds complete solutions to LeetCode problem #2110 "Number of Smooth Descent Periods of a Stock", implementing an efficient two-pointer algorithm to count all smooth descent periods in a stock price array.

Key changes:

• Implements solutions in 7 programming languages using a two-pointer approach with O(n) time complexity
• Provides comprehensive documentation in both Chinese and English explaining the algorithm and approach

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
Solution.py	Python implementation using integer division for arithmetic series calculation
Solution.java	Java implementation with proper long type handling for overflow prevention
Solution.cpp	C++ implementation using long long for large result values
Solution.go	Go implementation with int64 return type and proper type conversion
Solution.ts	TypeScript implementation with Math.floor for integer result
Solution.rs	Rust implementation with explicit i64 types for safe arithmetic
Solution.cs	C# implementation using long type with proper suffix notation
README.md	Chinese documentation explaining problem statement, constraints, and solution approach
README_EN.md	English documentation with comprehensive problem description and solution explanation

All implementations are correct, efficient, and follow language-specific best practices. No issues were identified during the review.

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