title: Check String Follows Anbn Pattern Not
signature: bool checkStringFollowsAnbnPatternNot(string str) {
test_code: #include <algorithm>
  #include <assert.h>
  #include <cstdlib>
  #include <iostream>
  #include <map>
  #include <set>
  #include <string>
  #include <tuple> 
  #include <unordered_map>
  #include <vector>
  #include <math.h>
  #include <cmath>
  #include <bits/stdc++.h>
  #include <numeric>
  #include <functional>
  
  using namespace std;
  
  // SOLUTION CODE
  // ============================================
  PLACEHOLDER_CODE_BODY
  
  // TESTING CODE 
  // ============================================
  bool validateSolution(bool actual, bool expected){
      return actual == expected;
  }
  
  string driver(string str, bool expected){
      try
      {
          if (validateSolution(PLACEHOLDER_FN_NAME(str), expected)){
              return "PASSED";
          }
          return "FAILED";
      }
      catch (const std::overflow_error& exception_obj)
      {
          return typeid(exception_obj).name();
      }
      catch (const std::runtime_error& exception_obj)
      {
          return typeid(exception_obj).name();
      }
      catch (const std::exception& exception_obj)
      {
          return typeid(exception_obj).name();
      }
      catch (...)
      {
          return "UNK_ERROR";
      }
  }
  
  int main() {
      string result = "";
  
      result = driver("ba", false); 
      cout << "TEST-" << 0 << "..."
           <<  result
           << "\n";
  
      result = driver("aabb", true); 
      cout << "TEST-" << 1 << "..."
           <<  result
           << "\n";
  
      result = driver("abab", false); 
      cout << "TEST-" << 2 << "..."
           <<  result
           << "\n";
  
      result = driver("aaabb", false); 
      cout << "TEST-" << 3 << "..."
           <<  result
           << "\n";
  
      result = driver("aabbb", false); 
      cout << "TEST-" << 4 << "..."
           <<  result
           << "\n";
  
      result = driver("abaabbaa", false); 
      cout << "TEST-" << 5 << "..."
           <<  result
           << "\n";
  
      result = driver("abaababb", false); 
      cout << "TEST-" << 6 << "..."
           <<  result
           << "\n";
  
      result = driver("bbaa", false); 
      cout << "TEST-" << 7 << "..."
           <<  result
           << "\n";
  
      result = driver("11001000", false); 
      cout << "TEST-" << 8 << "..."
           <<  result
           << "\n";
  
      result = driver("ZWXv te", false); 
      cout << "TEST-" << 9 << "..."
           <<  result
           << "\n";
  
      return 0;
  }
source_py: def check_string_follows_anbn_pattern_not(str):
      n = len(str)
      for i in range(n):
          if (str[i] != 'a'):
              break
      if ((i * 2) != n):
          return False
      for j in range(i, n):
          if (str[j] != 'b'):
              return False
      return True
source_cpp: bool check_string_follows_anbn_pattern_not(string str) {
    int n = str . length ( );
    int i;
    for ( i = 0;
    i < n;
    i ++ ) if ( str [ i ] != 'a' ) break;
    if ( i * 2 != n ) return false;
    int j;
    for ( j = i;
    j < n;
    j ++ ) if ( str [ j ] != 'b' ) return false;
    return true;
  }