title: Ways Remove One Element Binary String Xor Becomes Zero
signature: waysRemoveOneElementBinaryStringXorBecomesZero(str) {
test_code: import 'dart:convert';
  
  // SOLUTION CODE
  // ============================================
  PLACEHOLDER_CODE_BODY
  
  // TESTING CODE 
  // ============================================
  bool validateSolution(int actual, int expected){
      return actual.toString() == expected.toString();
  }
  
  String driver(str, int expected){
      try
      {
          if (validateSolution(PLACEHOLDER_FN_NAME(str), expected)){
              return "PASSED";
          }
          return "FAILED";
      }catch(exception_object){
          return exception_object.runtimeType.toString();
      }
  }
  
  int main() {
  
      print("TEST-0...${driver(
          "KfcTJNP", 
          7)
      }");
  
      print("TEST-1...${driver(
          "05312505872", 
          1)
      }");
  
      print("TEST-2...${driver(
          "100111", 
          2)
      }");
  
      print("TEST-3...${driver(
          "tDEEhKxrQ", 
          9)
      }");
  
      print("TEST-4...${driver(
          "50824233019", 
          1)
      }");
  
      print("TEST-5...${driver(
          "10001110010", 
          5)
      }");
  
      print("TEST-6...${driver(
          "T SEZaNm MYQ", 
          12)
      }");
  
      print("TEST-7...${driver(
          "838415739", 
          1)
      }");
  
      print("TEST-8...${driver(
          "01110100", 
          4)
      }");
  
      print("TEST-9...${driver(
          "WYQiAey H", 
          9)
      }");
  
      return 0;
  }
source_py: def ways_remove_one_element_binary_string_xor_becomes_zero(str):
      one_count = 0
      zero_count = 0
      n = len(str)
      for i in range(0, n, 1):
          if (str[i] == '1'):
              one_count += 1
          else:
              zero_count += 1
      if ((one_count % 2) == 0):
          return zero_count
      return one_count
source_cpp: int ways_remove_one_element_binary_string_xor_becomes_zero(string str) {
    int one_count = 0, zero_count = 0;
    int n = str . length ( );
    for ( int i = 0;
    i < n;
    i ++ ) if ( str [ i ] == '1' ) one_count ++;
    else zero_count ++;
    if ( one_count % 2 == 0 ) return zero_count;
    return one_count;
  }