title: Calculate Maximum Value Using Sign Two Numbers String
signature: calculateMaximumValueUsingSignTwoNumbersString(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(
          "pR", 
          2176)
      }");
  
      print("TEST-1...${driver(
          "9518", 
          368)
      }");
  
      print("TEST-2...${driver(
          "1", 
          1)
      }");
  
      print("TEST-3...${driver(
          "3170487", 
          6272)
      }");
  
      print("TEST-4...${driver(
          "0100101010", 
          4)
      }");
  
      print("TEST-5...${driver(
          "Z rONcUqWb", 
          -303)
      }");
  
      print("TEST-6...${driver(
          "00419297", 
          5670)
      }");
  
      print("TEST-7...${driver(
          "00", 
          0)
      }");
  
      print("TEST-8...${driver(
          "r", 
          66)
      }");
  
      return 0;
  }
source_py: def calculate_maximum_value_using_sign_two_numbers_string(str):
      res = (ord(str[0]) - 48)
      for i in range(1, len(str)):
          if ((str[i] == '0') or (str[i] == '1') or (res < 2)):
              res += (ord(str[i]) - 48)
          else:
              res *= (ord(str[i]) - 48)
      return res
source_cpp: int calculate_maximum_value_using_sign_two_numbers_string(string str) {
    int res = str [ 0 ] - '0';
    for ( int i = 1;
    i < str . length ( );
    i ++ ) {
      if ( str [ i ] == '0' || str [ i ] == '1' || res < 2 ) res += ( str [ i ] - '0' );
      else res *= ( str [ i ] - '0' );
    }
    return res;
  }