title: Count Numbers That Dont Contain 3
signature: class Solution {
  
      public decimal CountNumbersThatDontContain3(int n) {
test_code: using System;
  using System.Numerics;
  using System.Diagnostics;
  using System.Collections.Generic;
  using System.Linq;
  using System.Text;
  using System.Security.Cryptography;
  using System.Web.UI;
  using System.Web.Script.Serialization;
  
  // SOLUTION CODE
  // ============================================
  PLACEHOLDER_CODE_BODY
  
  // TESTING CODE 
  // ============================================
  namespace EvaluatePrediction {
      class TestRunner {
          public bool ValidateSolution(decimal actual, decimal expected){
              return Math.Abs(actual - expected) < 1e-09m;
          }
  
          public string driver(int n, decimal expected){
              try{
                PLACEHOLDER_CLS_NAME solution_cls = new PLACEHOLDER_CLS_NAME();
                decimal pred_result = solution_cls.PLACEHOLDER_FN_NAME(n); 
                if (ValidateSolution(
                      pred_result,
                      expected)){
                  return "PASSED";
                }
                return "FAILED";
              } 
              catch (Exception exception_obj)
              {
                return exception_obj.GetType().FullName;
              }
          }
          static void Main(string[] args) {
              TestRunner runner = new TestRunner();
              String result;
              result = runner.driver(
                  85, 
                  71.5m
              );
              Console.WriteLine(string.Format(
                  "TEST-0...{0}",
                  result)
              );result = runner.driver(
                  86, 
                  73.39999999999999m
              );
              Console.WriteLine(string.Format(
                  "TEST-1...{0}",
                  result)
              );result = runner.driver(
                  3, 
                  2.0m
              );
              Console.WriteLine(string.Format(
                  "TEST-2...{0}",
                  result)
              );result = runner.driver(
                  35, 
                  26.5m
              );
              Console.WriteLine(string.Format(
                  "TEST-3...{0}",
                  result)
              );result = runner.driver(
                  59, 
                  52.1m
              );
              Console.WriteLine(string.Format(
                  "TEST-4...{0}",
                  result)
              );result = runner.driver(
                  38, 
                  32.2m
              );
              Console.WriteLine(string.Format(
                  "TEST-5...{0}",
                  result)
              );result = runner.driver(
                  33, 
                  22.7m
              );
              Console.WriteLine(string.Format(
                  "TEST-6...{0}",
                  result)
              );result = runner.driver(
                  15, 
                  17.5m
              );
              Console.WriteLine(string.Format(
                  "TEST-7...{0}",
                  result)
              );result = runner.driver(
                  75, 
                  62.5m
              );
              Console.WriteLine(string.Format(
                  "TEST-8...{0}",
                  result)
              );result = runner.driver(
                  74, 
                  60.6m
              );
              Console.WriteLine(string.Format(
                  "TEST-9...{0}",
                  result)
              );
          }
      }
  }
  
source_py: def count_numbers_that_dont_contain_3(n):
      if (n < 3):
          return n
      elif ((n >= 3) and (n < 10)):
          return (n - 1)
      po = 1
      while ((n / po) > 9):
          po = (po * 10)
      msd = (n / po)
      if (msd != 3):
          return (((count_numbers_that_dont_contain_3(msd) * count_numbers_that_dont_contain_3((po - 1))) + count_numbers_that_dont_contain_3(msd)) + count_numbers_that_dont_contain_3((n % po)))
      else:
          return count_numbers_that_dont_contain_3(((msd * po) - 1))
source_cpp: int count_numbers_that_dont_contain_3(int n) {
    if ( n < 3 ) return n;
    if ( n >= 3 && n < 10 ) return n - 1;
    int po = 1;
    while ( n / po > 9 ) po = po * 10;
    int msd = n / po;
    if ( msd != 3 ) return count_numbers_that_dont_contain_3 ( msd ) * count_numbers_that_dont_contain_3 ( po - 1 ) + count_numbers_that_dont_contain_3 ( msd ) + count_numbers_that_dont_contain_3 ( n % po );
    else return count_numbers_that_dont_contain_3 ( msd * po - 1 );
  }