title: Number Subsequences Form Ai Bj Ck
signature: class Solution {
  
      public int NumberSubsequencesFormAiBjCk(string s) {
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(int actual, int expected){
              return new JavaScriptSerializer().Serialize(actual) == new JavaScriptSerializer().Serialize(expected);
          }
  
          public string driver(string s, int expected){
              try{
                PLACEHOLDER_CLS_NAME solution_cls = new PLACEHOLDER_CLS_NAME();
                int pred_result = solution_cls.PLACEHOLDER_FN_NAME(s); 
                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(
                  "", 
                  0
              );
              Console.WriteLine(string.Format(
                  "TEST-0...{0}",
                  result)
              );result = runner.driver(
                  "abbc", 
                  3
              );
              Console.WriteLine(string.Format(
                  "TEST-1...{0}",
                  result)
              );result = runner.driver(
                  "abcabc", 
                  7
              );
              Console.WriteLine(string.Format(
                  "TEST-2...{0}",
                  result)
              );result = runner.driver(
                  "agsdbkfdc ", 
                  1
              );
              Console.WriteLine(string.Format(
                  "TEST-3...{0}",
                  result)
              );result = runner.driver(
                  "ababab", 
                  0
              );
              Console.WriteLine(string.Format(
                  "TEST-4...{0}",
                  result)
              );result = runner.driver(
                  "aaaaaaa", 
                  0
              );
              Console.WriteLine(string.Format(
                  "TEST-5...{0}",
                  result)
              );result = runner.driver(
                  "aabaaabcc", 
                  111
              );
              Console.WriteLine(string.Format(
                  "TEST-6...{0}",
                  result)
              );result = runner.driver(
                  "19", 
                  0
              );
              Console.WriteLine(string.Format(
                  "TEST-7...{0}",
                  result)
              );result = runner.driver(
                  "1001100", 
                  0
              );
              Console.WriteLine(string.Format(
                  "TEST-8...{0}",
                  result)
              );result = runner.driver(
                  "DtAnuQbU", 
                  0
              );
              Console.WriteLine(string.Format(
                  "TEST-9...{0}",
                  result)
              );
          }
      }
  }
  
source_py: def number_subsequences_form_ai_bj_ck(s):
      aCount = 0
      bCount = 0
      cCount = 0
      for i in range(len(s)):
          if (s[i] == 'a'):
              aCount = (1 + (2 * aCount))
          elif (s[i] == 'b'):
              bCount = (aCount + (2 * bCount))
          elif (s[i] == 'c'):
              cCount = (bCount + (2 * cCount))
      return cCount
source_cpp: int number_subsequences_form_ai_bj_ck(string s) {
    int aCount = 0;
    int bCount = 0;
    int cCount = 0;
    for ( unsigned int i = 0;
    i < s . size ( );
    i ++ ) {
      if ( s [ i ] == 'a' ) aCount = ( 1 + 2 * aCount );
      else if ( s [ i ] == 'b' ) bCount = ( aCount + 2 * bCount );
      else if ( s [ i ] == 'c' ) cCount = ( bCount + 2 * cCount );
    }
    return cCount;
  }