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  1. using System;
  2. using System.Collections.Generic;
  3. using System.Linq;
  4.  
  5. public class Test
  6. {
  7. 	public static void Main()
  8. 	{
  9. 	    var index = new Dictionary<string, HashSet<int>>
  10. 	    {
  11. 	        { "hello", new HashSet<int> { 0, 5, 1 } },
  12. 	        { "world", new HashSet<int> { 1, 23 } },
  13. 	        { "onenote", new HashSet<int> { 47, 23, 1 } }
  14. 	    };
  15.  
  16. 	    var query = "hello world xyz".Split();
  17. 	    var scores = query.Where(term => index.ContainsKey(term))
  18. 	                      .SelectMany(term => index[term])
  19. 	                      .GroupBy(x => x)
  20. 	                      .ToDictionary(group => group.Key, group => group.Count());
  21.  
  22. 	    foreach (var kvp in scores.OrderByDescending(x => x.Value).Take(3))
  23. 	    {
  24. 	        Console.WriteLine("Document {0} scored {1}", kvp.Key, kvp.Value);
  25. 	    }
  26. 	}
  27. }
Success #stdin #stdout 0.07s 24752KB
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stdin
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Standard input is empty
stdout
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Document 1 scored 2
Document 0 scored 1
Document 5 scored 1
https://ideone.com/W4shEE
language:
C# (gmcs 5.20.1)
created:
10 years ago
visibility:
public

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