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  1. using System;
  2. using System.Collections.Generic;
  3. using System.Diagnostics;
  4. using System.Linq;
  5.  
  6.     class Program {
  7.  
  8.         static void Main(string[] args) {
  9.             var source = Enumerable.Range(0, 10000000);
  10.             var sw = Stopwatch.StartNew();
  11.             var r = Windowed(source, 3).Count();
  12.             sw.Stop();
  13.             Console.WriteLine(r);
  14.             Console.WriteLine(sw.Elapsed);
  15.         }
  16.  
  17.         static IEnumerable<T[]> Windowed<T>(IEnumerable<T> source, int windowSize) {
  18.             if (source == null)
  19.                 throw new ArgumentNullException("source");
  20.             if (windowSize <= 0)
  21.                 throw new ArgumentOutOfRangeException("windowSize");
  22.             var arr = new T[windowSize];
  23.             int r = (windowSize - 1);
  24.             int i = 0;
  25.             foreach (var item in source) {
  26.                 arr[i] = item;
  27.                 i = (i + 1) % windowSize;
  28.                 if (r == 0) {
  29.                     var arrR = new T[windowSize];
  30.                     for (int j = 0; j < windowSize; j++)
  31.                         arrR[j] = arr[(i + j) % windowSize];
  32.                     yield return arrR;
  33.                 } else {
  34.                     r--;
  35.                 }
  36.             }
  37.         }
  38.     }
  39.  
Success #stdin #stdout 3.12s 37080KB
comments (?)
stdin 
Standard input is empty
stdout 
9999998
00:00:03.0943769
https://ideone.com/9MeYS
language:
C# (gmcs 5.20.1)
created:
12 years ago
visibility:
secret

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