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  1. using System;
  2. using System.Collections.Generic;
  3. using System.Linq;
  4. using System.Text;
  5.  
  6. public class Test
  7. {
  8.         public static void Main()
  9.         {
  10.             var values = (new[] { 9, 9, 15, 15, 15, 30, 9 }).Select((x, i) => new { x, i });
  11.  
  12.         var query = from v in values
  13.                     let firstNonValue = values.Where(v2 => v2.i >= v.i && v2.x != v.x).FirstOrDefault()
  14.                     let grouping = firstNonValue == null ? int.MaxValue : firstNonValue.i
  15.                     group v by grouping into v
  16.                     select new
  17.                     {
  18.                         From = v.Min(y => y.i) + 1,
  19.                         To = v.Max(y => y.i) + 1,
  20.                         Value = v.Min(y => y.x)
  21.                     };
  22.         var result = query.ToArray();
  23.  
  24.         foreach (var x in result)
  25.         {
  26.             Console.WriteLine("From: {0}\tTo: {1}\tValue: {2}", x.From, x.To, x.Value);
  27.         }
  28.         }
  29. }
Success #stdin #stdout 0.06s 34104KB
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stdin
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Standard input is empty
stdout
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From: 1	To: 2	Value: 9
From: 3	To: 5	Value: 15
From: 6	To: 6	Value: 30
From: 7	To: 7	Value: 9
https://ideone.com/Cd78qv
language:
C# (gmcs 5.20.1)
created:
11 years ago
visibility:
public

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