title: Sum Two Large Numbers
signature: def sumTwoLargeNumbers(str1: String, str2: String) = {
test_code: import scala.collection.mutable.HashMap
  import scala.collection.immutable.HashSet
  
  
  // SOLUTION CODE
  // ============================================
  PLACEHOLDER_CODE_BODY
  
  
  // TESTING CODE 
  // ============================================
  def validateSolution(actual: String , expected: String): Boolean = {
      actual.toString == expected.toString
  }
  
  def driver(str1: String, str2: String, expected: String): String = {
      try {
          if (validateSolution(PLACEHOLDER_FN_NAME(str1, str2),expected)) {
              "PASSED"
          } else{
              "FAILED"
          }
      }catch{
          case e: Exception => {e.getClass.getName}
      }
  
  }
  object QuestionEvaluator extends App {
  
      println(s"TEST-0...${driver(
        "VkfzrPG", "rKZ", 
        "44527855"    
      )}")   
  
  
      println(s"TEST-1...${driver(
        "0526110506447", "903", 
        "0526110507350"    
      )}")   
  
  
      println(s"TEST-2...${driver(
        "011010010", "110100000", 
        "121110010"    
      )}")   
  
  
      println(s"TEST-3...${driver(
        "sPAwZACc ", "liYMsojPiinOV", 
        "66153436372942"    
      )}")   
  
  
      println(s"TEST-4...${driver(
        "3", "611", 
        "614"    
      )}")   
  
  
      println(s"TEST-5...${driver(
        "0101", "01110101011", 
        "01110101112"    
      )}")   
  
  
      println(s"TEST-6...${driver(
        "VTtNu", "Wsmc", 
        "469530"    
      )}")   
  
  
      println(s"TEST-7...${driver(
        "2317170", "898421173423", 
        "898423490593"    
      )}")   
  
  
      println(s"TEST-8...${driver(
        "111111000010", "01100001110111", 
        "01211112110121"    
      )}")   
  
  
      println(s"TEST-9...${driver(
        "Ktt", "CTbbVX wGBkE", 
        "2315420138859"    
      )}")   
  
  }
  
source_py: def sum_two_large_numbers(str1, str2):
      if (len(str1) > len(str2)):
          t = str1
          str1 = str2
          str2 = t
      str = ''
      n1 = len(str1)
      n2 = len(str2)
      str1 = str1[::(- 1)]
      str2 = str2[::(- 1)]
      carry = 0
      for i in range(n1):
          sum = ((ord(str1[i]) - 48) + ((ord(str2[i]) - 48) + carry))
          str += chr(((sum % 10) + 48))
          carry = int((sum / 10))
      for i in range(n1, n2):
          sum = ((ord(str2[i]) - 48) + carry)
          str += chr(((sum % 10) + 48))
          carry = int((sum / 10))
      if carry:
          str += chr((carry + 48))
      str = str[::(- 1)]
      return str
source_cpp: string sum_two_large_numbers(string str1, string str2) {
    if ( str1 . length ( ) > str2 . length ( ) ) swap ( str1, str2 );
    string str = "";
    int n1 = str1 . length ( ), n2 = str2 . length ( );
    reverse ( str1 . begin ( ), str1 . end ( ) );
    reverse ( str2 . begin ( ), str2 . end ( ) );
    int carry = 0;
    for ( int i = 0;
    i < n1;
    i ++ ) {
      int sum = ( ( str1 [ i ] - '0' ) + ( str2 [ i ] - '0' ) + carry );
      str . push_back ( sum % 10 + '0' );
      carry = sum / 10;
    }
    for ( int i = n1;
    i < n2;
    i ++ ) {
      int sum = ( ( str2 [ i ] - '0' ) + carry );
      str . push_back ( sum % 10 + '0' );
      carry = sum / 10;
    }
    if ( carry ) str . push_back ( carry + '0' );
    reverse ( str . begin ( ), str . end ( ) );
    return str;
  }