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Added article for contains duplicate problem #4332

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Summary

  • Added a detailed markdown article for the "Contains Duplicate" question
  • Includes 4 approaches: Brute Force, Sorting, Hash Set, and Set Size Comparison
  • Explained intuition, C++ code, time and space complexity
  • Matches NeetCode video logic

I'm interested in contributing more articles. Please let me know if there's a priority list or specific questions you'd like help with!

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