title: Count Of Occurrences Of A 101 Pattern In A String
signature: int countOfOccurrencesOfA101PatternInAString(string s) {
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(int actual, int expected){
      return actual == expected;
  }
  
  string driver(string s, int expected){
      try
      {
          if (validateSolution(PLACEHOLDER_FN_NAME(s), 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("1001ab010abc01001", 2); 
      cout << "TEST-" << 0 << "..."
           <<  result
           << "\n";
  
      result = driver("1001010001", 3); 
      cout << "TEST-" << 1 << "..."
           <<  result
           << "\n";
  
      result = driver("010100010100", 3); 
      cout << "TEST-" << 2 << "..."
           <<  result
           << "\n";
  
      result = driver("DLCu", 0); 
      cout << "TEST-" << 3 << "..."
           <<  result
           << "\n";
  
      result = driver("7072430592", 0); 
      cout << "TEST-" << 4 << "..."
           <<  result
           << "\n";
  
      result = driver("011", 0); 
      cout << "TEST-" << 5 << "..."
           <<  result
           << "\n";
  
      result = driver("pnJpypYOza", 0); 
      cout << "TEST-" << 6 << "..."
           <<  result
           << "\n";
  
      result = driver("1037", 0); 
      cout << "TEST-" << 7 << "..."
           <<  result
           << "\n";
  
      result = driver("111", 0); 
      cout << "TEST-" << 8 << "..."
           <<  result
           << "\n";
  
      result = driver("HxK", 0); 
      cout << "TEST-" << 9 << "..."
           <<  result
           << "\n";
  
      return 0;
  }
source_py: def count_of_occurrences_of_a_101_pattern_in_a_string(s):
      length = len(s)
      oneSeen = False
      count = 0
      for i in range(length):
          if ((s[i] == '1') and oneSeen):
              if (s[(i - 1)] == '0'):
                  count += 1
          if ((s[i] == '1') and (oneSeen == 0)):
              oneSeen = True
          if ((s[i] != '0') and (s[i] != '1')):
              oneSeen = False
      return count
source_cpp: int count_of_occurrences_of_a_101_pattern_in_a_string(string str) {
    int len = str . size ( );
    bool oneSeen = 0;
    int count = 0;
    for ( int i = 0;
    i < len;
    i ++ ) {
      if ( str [ i ] == '1' && oneSeen == 1 ) if ( str [ i - 1 ] == '0' ) count ++;
      if ( str [ i ] == '1' && oneSeen == 0 ) {
        oneSeen = 1;
        continue;
      }
      if ( str [ i ] != '0' && str [ i ] != '1' ) oneSeen = 0;
    }
    return count;
  }