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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 IEnumerable<T?>[] Aligned<T>(params List<T>[] lists)
  8.         where T : struct
  9.     {
  10.         var all = new HashSet<T>();
  11.         foreach (var list in lists)
  12.             all.UnionWith(list);
  13.  
  14.         return lists.Select(list => all.Select(val => 
  15.                 list.BinarySearch(val) >= 0? val : default(T?)
  16.             )).ToArray();
  17.     }
  18.  
  19.     public static void Main()
  20.     {
  21.         var list1 = new List<int>() { 1, 2, 3, 4 };
  22.         var list2 = new List<int>() { 2, 3, 5, 6, 7, 8 };
  23.         var list3 = new List<int>() { 3, 4, 5 };
  24.  
  25.         var aligned = Aligned(list1, list2, list3);
  26.  
  27.         Console.WriteLine("new list1[5]: {0}", aligned[0].ElementAt(5));
  28.         Console.WriteLine("new list2[8]: {0}", aligned[1].ElementAt(7));
  29.  
  30.         var newlist3 = aligned[2].ToList();
  31.     }
  32. }
  33.  
Success #stdin #stdout 0.05s 38312KB
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Standard input is empty
stdout
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new list1[5]: 
new list2[8]: 8
https://ideone.com/AghZ0k
language:
C# (gmcs 5.20.1)
created:
12 years ago
visibility:
public

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