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  1. using System;
  2. using System.Collections.Generic;
  3. using System.Linq;
  4.  
  5. namespace Interview_ConsecutiveSequence
  6. {
  7.     class Program
  8.     {
  9.         public static int GetMaxLengthConsecutiveSequence(int[] numbers)
  10.         {
  11.             HashSet<int> set = BuildHashSet(numbers);
  12.             return AnalyzeHashSet(set);
  13.         }
  14.  
  15.         private static HashSet<int> BuildHashSet(int[] numbers)
  16.         {
  17.             var set = new HashSet<int>();
  18.             foreach(int number in numbers)
  19.             {
  20.                 set.Add(number);
  21.             }
  22.  
  23.             return set;
  24.         }
  25.  
  26.         private static int AnalyzeHashSet(HashSet<int> set)
  27.         {
  28.             int maxCount = 0;
  29.             while(set.Count > 0)
  30.             {
  31.                 int number = set.First();
  32.                 int count = 0;
  33.                 int toDelete = number;
  34.  
  35.                 while(set.Remove(toDelete))
  36.                 {
  37.                     count++;
  38.                     toDelete++;
  39.                 }
  40.  
  41.                 toDelete = number - 1;
  42.                 while(set.Remove(toDelete))
  43.                 {
  44.                     count++;
  45.                     toDelete--;
  46.                 }
  47.  
  48.                 if(count > maxCount)
  49.                 {
  50.                     maxCount = count;
  51.                 }
  52.             }
  53.  
  54.             return maxCount;
  55.         }
  56.  
  57.         private static void Test(string testName, int[] numbers, int expected)
  58.         {
  59.             if (GetMaxLengthConsecutiveSequence(numbers) == expected)
  60.             {
  61.                 Console.WriteLine(string.Format("{0} passed.", testName));
  62.             }
  63.             else
  64.             {
  65.                 Console.WriteLine(string.Format("{0} FAILED.", testName));
  66.             }
  67.         }
  68.  
  69.         private static void Test1()
  70.         {
  71.             int[] numbers = { 1, 300, 3, 2, 101, 4, 102 };
  72.             int expected = 4;
  73.             Test("test1", numbers, expected);
  74.         }
  75.  
  76.         private static void Test2()
  77.         {
  78.             int[] numbers = { 1, 2, 3, 4, 5 };
  79.             int expected = 5;
  80.             Test("test2", numbers, expected);
  81.         }
  82.  
  83.  
  84.         private static void Test3()
  85.         {
  86.             int[] numbers = { 5, 4, 3, 2 };
  87.             int expected = 4;
  88.             Test("test3", numbers, expected);
  89.         }
  90.  
  91.         private static void Test4()
  92.         {
  93.             int[] numbers = { 1, 3, 2, 4, 5, 19, 18, 17, 16 };
  94.             int expected = 5;
  95.             Test("test4", numbers, expected);
  96.         }
  97.  
  98.         private static void Test5()
  99.         {
  100.             int[] numbers = { 1, 6, 3, 5, 9, 7 };
  101.             int expected = 3;
  102.             Test("test5", numbers, expected);
  103.         }
  104.  
  105.         static void Main(string[] args)
  106.         {
  107.             Test1();
  108.             Test2();
  109.             Test3();
  110.             Test4();
  111.             Test5();
  112.         }
  113.     }
  114. }
  115.  
Success #stdin #stdout 0.04s 33952KB
comments (?)
stdin 
Standard input is empty
stdout 
test1 passed.
test2 passed.
test3 passed.
test4 passed.
test5 passed.
https://ideone.com/0oRqLq
Get the max length of a conscutive sequence out of an array
language:
C# (gmcs 5.20.1)
created:
10 years ago
visibility:
public

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