feat: add rust solution to lc problem: No.3531 #4896
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Pull request overview
This PR adds a Rust implementation for LeetCode problem #3531 "Count Covered Buildings". The solution correctly identifies buildings that have at least one building in all four cardinal directions (left, right, up, down) by using hash maps to group buildings by coordinates and checking coverage conditions.
Key Changes
- Implements a Rust solution using HashMap-based grouping and sorting approach
- Uses O(n log n) time complexity where n is the number of buildings
- Follows the same algorithmic approach as other language implementations (Python, C++, Go, Java, TypeScript)
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