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  1. using System;
  2. using System.Globalization;
  3.  
  4. class Program
  5. {
  6.     static void Main()
  7.     {
  8.         // 1) Read x
  9.         string line = Console.ReadLine();
  10.         if (line == null) 
  11.         {
  12.             // no input at all – you can choose to print an error or just exit
  13.             Console.WriteLine("NO");
  14.             return;
  15.         }
  16.  
  17.         line = line.Trim().Replace(',', '.');
  18.         if (!double.TryParse(line, NumberStyles.Any, CultureInfo.InvariantCulture, out double x))
  19.         {
  20.             // parsing failed — decide on a default
  21.             Console.WriteLine("NO");
  22.             return;
  23.         }
  24.  
  25.         // 2) Read expr index
  26.         line = Console.ReadLine();
  27.         if (line == null || !int.TryParse(line.Trim(), out int expr))
  28.         {
  29.             Console.WriteLine("NO");
  30.             return;
  31.         }
  32.  
  33.         const double eps = 1e-6;
  34.         bool result;
  35.  
  36.         switch (expr)
  37.         {
  38.             case 1:
  39.                 // 6*x - 10.2 == 4*x - 2.2
  40.                 result = Math.Abs((6 * x - 10.2) - (4 * x - 2.2)) < eps;
  41.                 break;
  42.             case 2:
  43.                 // 15 - (3*x - 3) == 5 - 4*x
  44.                 result = Math.Abs((15 - (3 * x - 3)) - (5 - 4 * x)) < eps;
  45.                 break;
  46.             case 3:
  47.                 // 2*(x - 0.5) + 1 == 9
  48.                 result = Math.Abs((2 * (x - 0.5) + 1) - 9) < eps;
  49.                 break;
  50.             default:
  51.                 // out‐of‐range expr — treat as NO (or handle as error)
  52.                 result = false;
  53.                 break;
  54.         }
  55.  
  56.         Console.WriteLine(result ? "YES" : "NO");
  57.     }
  58. }
  59.  
Success #stdin #stdout 0.07s 28488KB
comments (?)
stdin 
Standard input is empty
stdout 
NO
https://ideone.com/A3nyfU
language:
C# (NET 6.0)
created:
9 days ago
visibility:
public

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