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  1. using System;
  2.  
  3. public class NumberTranslation
  4. {
  5.     public static int GetTranslationCount(int number)
  6.     {
  7.         if(number <= 0)
  8.         {
  9.             return 0;
  10.         }
  11.  
  12.         string numberInString = number.ToString();
  13.         return GetTranslationCount(numberInString);
  14.     }
  15.  
  16.     private static int GetTranslationCount(string number)
  17.     {
  18.         int length = number.Length;
  19.         int[] counts = new int[length];
  20.  
  21.         for(int i = length - 1; i >= 0; --i)
  22.         {
  23.             int count = 0;
  24.             if(number[i] >= '1' && number[i] <= '9')
  25.             {
  26.                 if(i < length - 1)
  27.                 {
  28.                     count += counts[i + 1];
  29.                 }
  30.                 else
  31.                 {
  32.                     count += 1;
  33.                 }
  34.             }
  35.  
  36.             if(i < length - 1)
  37.             {
  38.                 int digit1 = number[i] - '0';
  39.                 int digit2 = number[i + 1] - '0';
  40.                 int converted = digit1 * 10 + digit2;
  41.                 if(converted >= 10 && converted <= 26)
  42.                 {
  43.                     if(i < length - 2)
  44.                     {
  45.                         count += counts[i + 2];
  46.                     }
  47.                     else
  48.                     {
  49.                         count += 1;
  50.                     }
  51.                 }
  52.             }
  53.  
  54.             counts[i] = count;
  55.         }
  56.  
  57.         return counts[0];
  58.     }
  59.  
  60.     // ------------------ Test Code ------------------
  61.     private static void Test(string testName, int number, int expected)
  62.     {
  63.         if(GetTranslationCount(number) == expected)
  64.         {
  65.             Console.WriteLine(testName + " passed.");
  66.         }
  67.         else
  68.         {
  69.             Console.WriteLine(testName + " FAILED.");
  70.         }
  71.     }
  72.  
  73.     private static void Test1()
  74.     {
  75.         int number = 1;
  76.         int expected = 1;
  77.         Test("Test1", number, expected);
  78.     }
  79.  
  80.     private static void Test2()
  81.     {
  82.         int number = 11;
  83.         int expected = 2;
  84.         Test("Test2", number, expected);
  85.     }
  86.  
  87.     private static void Test3()
  88.     {
  89.         int number = 126;
  90.         int expected = 3;
  91.         Test("Test3", number, expected);
  92.     }
  93.  
  94.     private static void Test4()
  95.     {
  96.         int number = 127;
  97.         int expected = 2;
  98.         Test("Test4", number, expected);
  99.     }
  100.  
  101.     private static void Test5()
  102.     {
  103.         int number = 427;
  104.         int expected = 1;
  105.         Test("Test5", number, expected);
  106.     }
  107.  
  108.     private static void Test6()
  109.     {
  110.         int number = 100;
  111.         int expected = 0;
  112.         Test("Test6", number, expected);
  113.     }
  114.  
  115.     private static void Test7()
  116.     {
  117.         int number = 101;
  118.         int expected = 1;
  119.         Test("Test7", number, expected);
  120.     }
  121.  
  122.     private static void Test8()
  123.     {
  124.         int number = 12258;
  125.         int expected = 5;
  126.         Test("Test8", number, expected);
  127.     }
  128.  
  129.     public static void Main()
  130.     {
  131.         Test1();
  132.         Test2();
  133.         Test3();
  134.         Test4();
  135.         Test5();
  136.         Test6();
  137.         Test7();
  138.         Test8();
  139.     }
  140. }
Success #stdin #stdout 0.03s 33800KB
comments (?)
stdin
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Standard input is empty
stdout
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Test1 passed.
Test2 passed.
Test3 passed.
Test4 passed.
Test5 passed.
Test6 passed.
Test7 passed.
Test8 passed.
https://ideone.com/7wihgj
Convert a number into string
language:
C# (gmcs 5.20.1)
created:
9 years ago
visibility:
public

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