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  1. using System;
  2. using System.Linq;
  3. using System.Collections.Generic;
  4.  
  5. namespace ConsoleApplication1
  6. {
  7.     class Program
  8.     {
  9.         static void Main(string[] args)
  10.         {
  11.             int[] arraydada = { 1, 2, 2, 3, 10, 11, 100, 101, 102, 103 };
  12.  
  13.             var groups = arraydada
  14.                 .DistinctAdjacently()
  15.                 .Differences()
  16.                 .Split(x => x.Difference != 1)
  17.                 .Select(x => new { First = x.First().Value, Count = x.Count() });
  18.  
  19.             foreach (var g in groups)
  20.             {
  21.                 Console.WriteLine("{0}を先頭に{1}個", g.First, g.Count);
  22.             }
  23.         }
  24.  
  25.     }
  26.  
  27.     /// <summary>
  28.     /// シーケンス中の値と、階差(前の要素との差分)のペア。
  29.     /// </summary>
  30.     public class ValueDifferencePair
  31.     {
  32.         public ValueDifferencePair(int value, int difference)
  33.         {
  34.             this.value = value;
  35.             this.difference = difference;
  36.         }
  37.  
  38.         private readonly int value;
  39.  
  40.         /// <summary>
  41.         /// 値。
  42.         /// </summary>
  43.         public int Value
  44.         {
  45.             get { return value; }
  46.         }
  47.  
  48.         private readonly int difference;
  49.  
  50.         /// <summary>
  51.         /// 前の要素との差分。
  52.         /// </summary>
  53.         public int Difference
  54.         {
  55.             get { return difference; }
  56.         }
  57.     }
  58.  
  59.     public static partial class IntegerSequence
  60.     {
  61.         /// <summary>
  62.         /// 隣り合ってる同じ値を1つにまとめてしまう。
  63.         /// </summary>
  64.         /// <typeparam name="T">要素の型</typeparam>
  65.         /// <param name="seq">元シーケンス。</param>
  66.         /// <returns>隣り合った重複を削除したシーケンス。</returns>
  67.         public static IEnumerable<T> DistinctAdjacently<T>(this IEnumerable<T> seq)
  68.             where T : struct
  69.         {
  70.             T? prev = null;
  71.  
  72.             foreach (var x in seq)
  73.             {
  74.                 if (prev == null || !prev.Equals(x))
  75.                 {
  76.                     yield return x;
  77.                 }
  78.  
  79.                 prev = x;
  80.             }
  81.         }
  82.  
  83.         /// <summary>
  84.         /// 特定の条件を満たすところでシーケンスを分割する。
  85.         /// （条件を満たした箇所がサブ シーケンスの先頭になる。）
  86.         /// 
  87.         /// 例えば、{ 1, 1, 0, 1, 1, 0 } というシーケンスを渡して、
  88.         /// 「要素が 0」という条件で分割すると、結果は
  89.         /// { { 1, 1 }, { 0, 1, 1 }, { 0 } }
  90.         /// となる。
  91.         /// </summary>
  92.         /// <typeparam name="T">要素の型</typeparam>
  93.         /// <param name="seq">元シーケンス。</param>
  94.         /// <param name="splitCondition">分割条件。</param>
  95.         /// <returns>分割したサブ シーケンス群。</returns>
  96.         public static IEnumerable<IEnumerable<T>> Split<T>(this IEnumerable<T> seq, Predicate<T> splitCondition)
  97.         {
  98.             List<T> sub = null;
  99.  
  100.             foreach (var x in seq)
  101.             {
  102.                 if (splitCondition(x) && sub != null)
  103.                 {
  104.                     yield return sub;
  105.                     sub = new List<T>();
  106.                 }
  107.                 if (sub == null)
  108.                 {
  109.                     sub = new List<T>();
  110.                 }
  111.  
  112.                 sub.Add(x);
  113.             }
  114.  
  115.             if (sub != null && sub.Count != 0)
  116.             {
  117.                 yield return sub;
  118.             }
  119.         }
  120.  
  121.         /// <summary>
  122.         /// シーケンスの階差を作る。
  123.         /// </summary>
  124.         /// <param name="seq">シーケンス。</param>
  125.         /// <returns>値/階差のペアのシーケンス。</returns>
  126.         public static IEnumerable<ValueDifferencePair> Differences(this IEnumerable<int> seq)
  127.         {
  128.             int? prev = null;
  129.  
  130.             foreach (var x in seq)
  131.             {
  132.                 var diff = prev == null ? 0 : x - (int)prev;
  133.  
  134.                 yield return new ValueDifferencePair(x, diff);
  135.  
  136.                 prev = x;
  137.             }
  138.         }
  139.     }
  140. }
  141.  
Runtime error #stdin #stdout 0.05s 17008KB
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https://ideone.com/YBUbt
language:
C# (gmcs 5.20.1)
created:
14 years ago
visibility:
secret

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