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  1. using System;
  2. using System.Collections.Generic;
  3. using System.Diagnostics;
  4. using System.Linq;
  5.  
  6. static class Program
  7. {
  8.     static List<string> authors = new List<string> { "A", "B", "C", "A" }; 
  9.  
  10.     static void Main()
  11.     {
  12.         var edge = new List<int> { 0, 1, 2, 3 };
  13.         foreach (var duplicate in authors.GetDuplicates())
  14.         {
  15.             for (int j = 0; j < edge.Count; j++)
  16.             {
  17.                 for (int k = 0; k < duplicate.Count - 1; k++)
  18.                 {
  19.                     if (edge[j] == duplicate[k])
  20.                     {
  21.                         edge[j] = duplicate[k + 1];
  22.                     }
  23.                 }
  24.             }
  25.         }
  26.  
  27.         Debug.Assert(edge.SequenceEqual(new[] { 3, 1, 2, 3 }));
  28.         foreach (var e in edge)
  29.         {
  30.         	Console.WriteLine(e);
  31.         }
  32.     }
  33.  
  34.     public static List<List<int>> GetDuplicates(this IList<string> source)
  35.     {
  36.         HashSet<string> itemsSeen = new HashSet<string>();
  37.         HashSet<string> itemsYielded = new HashSet<string>();
  38.         List<List<int>> duplicates = new List<List<int>>();
  39.         List<int> dupLow = new List<int>();
  40.         HashSet<int> temp = new HashSet<int>();
  41.  
  42.         int c = 0;
  43.  
  44.         foreach (string item in source)
  45.         {
  46.             if (!itemsSeen.Add(item))
  47.             {
  48.                 if (itemsYielded.Add(item))
  49.                 {
  50.                     if (item != "-")
  51.                     {
  52.                         int w = 0;
  53.  
  54.                         for (int j = 0; j < authors.Count; j++)
  55.                         {
  56.                             if (authors[j] == authors[c])
  57.                             {
  58.                                 temp.Add(w);
  59.                             }
  60.                             w++;
  61.                         }
  62.  
  63.                         dupLow = new List<int>(temp);
  64.                         duplicates.Add(dupLow);
  65.                         temp.Clear();
  66.                     }
  67.                 }
  68.             }
  69.             c++;
  70.         }
  71.         return duplicates;
  72.     }
  73. }
  74.  
Success #stdin #stdout 0.05s 34944KB
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stdout 
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https://ideone.com/TqtF8T
language:
C# (gmcs 5.20.1)
created:
9 years ago
visibility:
public

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