feat: valid_anagram.cpp #3031
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feat: valid_anagram.cpp #3031
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Description of Change
This pull request adds a new algorithm for checking if two strings are valid anagrams.
The implementation uses a hash table (std::unordered_map) to efficiently count and compare character frequencies. The file is self-contained and includes Doxygen-style documentation explaining the algorithm, along with a test() function to verify its correctness against various cases.
Checklist
Notes: Adds a new, self-contained, and tested anagram checker algorithm.