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  1. namespace _07.Take_Or_Skip_Rope
  2. {
  3.     using System;
  4.     using System.Collections.Generic;
  5.     using System.Globalization;
  6.     using System.Linq;
  7.     using System.Text.RegularExpressions;
  8.     using System.Text;
  9.  
  10.     public class TakeOrSkipRope
  11.     {
  12.         public static void Main()
  13.         {
  14.             var text = Console.ReadLine();
  15.  
  16.             var numbersList = new List<int>();
  17.             numbersList = GetNumbersList(text);
  18.             var textWithoutDigits = GetTextWithoutDigits(text);
  19.  
  20.             var takeList = GetTakeList(numbersList);
  21.             var skipList = GetSkipList(numbersList);
  22.  
  23.             var result =  new StringBuilder();
  24.             var skipTotal = 0;
  25.  
  26.             for (int i = 0; i < skipList.Count; i++)
  27.             {
  28.                 result.Append(string.Concat(textWithoutDigits.Skip(skipTotal).Take(takeList[i])));
  29.                 skipTotal += takeList[i] + skipList[i];
  30.             }
  31.  
  32.             Console.WriteLine(result.ToString());
  33.         }
  34.  
  35.         public static List<int> GetNumbersList(string text)
  36.         {
  37.             var numbersList = new List<int>();
  38.  
  39.             foreach (var letter in text)
  40.             {
  41.                 if (char.IsNumber(letter))
  42.                 {
  43.                     numbersList.Add(int.Parse(letter.ToString()));
  44.                 }
  45.             }
  46.  
  47.             return numbersList;
  48.         }
  49.  
  50.         public static string GetTextWithoutDigits(string text)
  51.         {
  52.             var sb = new StringBuilder();
  53.  
  54.             foreach (var letter in text)
  55.             {
  56.                 if (!char.IsNumber(letter))
  57.                 {
  58.                     sb.Append(letter);
  59.                 }
  60.             }
  61.  
  62.             return sb.ToString();
  63.         }
  64.  
  65.         public static List<int> GetSkipList (List<int> numbers)
  66.         {
  67.             var skipList = new List<int>();
  68.  
  69.             for (int i = 1; i < numbers.Count; i+=2)
  70.             {
  71.                 skipList.Add(numbers[i]);
  72.             }
  73.  
  74.             return skipList;
  75.         }
  76.  
  77.         public static List<int> GetTakeList(List<int> numbers)
  78.         {
  79.             var takeList = new List<int>();
  80.  
  81.             for (int i = 0; i < numbers.Count; i += 2)
  82.             {
  83.                 takeList.Add(numbers[i]);
  84.             }
  85.  
  86.             return takeList;
  87.         }
  88.     }
  89. }
Runtime error #stdin #stdout #stderr 0.01s 135936KB
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stdin
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Standard input is empty
stdout
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Standard output is empty
stderr
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Unhandled Exception:
System.NullReferenceException: Object reference not set to an instance of an object
  at _07.Take_Or_Skip_Rope.TakeOrSkipRope.GetNumbersList (System.String text) [0x0003e] in <4d9ee629e3a1400384ab15e4547462dd>:0 
  at _07.Take_Or_Skip_Rope.TakeOrSkipRope.Main () [0x0000c] in <4d9ee629e3a1400384ab15e4547462dd>:0 
[ERROR] FATAL UNHANDLED EXCEPTION: System.NullReferenceException: Object reference not set to an instance of an object
  at _07.Take_Or_Skip_Rope.TakeOrSkipRope.GetNumbersList (System.String text) [0x0003e] in <4d9ee629e3a1400384ab15e4547462dd>:0 
  at _07.Take_Or_Skip_Rope.TakeOrSkipRope.Main () [0x0000c] in <4d9ee629e3a1400384ab15e4547462dd>:0
https://ideone.com/NDPviI
language:
C# (gmcs 5.20.1)
created:
6 years ago
visibility:
secret

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