title: Sum Two Large Numbers
signature: fun sumTwoLargeNumbers(str1: String, str2: String): String {
test_code: package main
  
  import kotlin.text.*
  import kotlin.math.*
  
  
  // SOLUTION CODE
  // ===================================
  PLACEHOLDER_CODE_BODY
  
  // TESTING CODE
  // ===================================
  fun validateSolution(actual:String, expected:String):Boolean{
    return actual.equals(expected)
  }
  fun driver(str1: String, str2: String, expected:String):String {
      try{
        if (validateSolution(PLACEHOLDER_FN_NAME(str1, str2), expected)) {
                return "PASSED"
        }
        return "FAILED"
      } catch (e: Exception){
        return e::class.simpleName as String
      }
  
  }
  
  fun main() {
      var result: String = ""
      result = driver("VkfzrPG", "rKZ", "44527855")
      println("TEST-0...${result}")
      
      result = driver("0526110506447", "903", "0526110507350")
      println("TEST-1...${result}")
      
      result = driver("011010010", "110100000", "121110010")
      println("TEST-2...${result}")
      
      result = driver("sPAwZACc ", "liYMsojPiinOV", "66153436372942")
      println("TEST-3...${result}")
      
      result = driver("3", "611", "614")
      println("TEST-4...${result}")
      
      result = driver("0101", "01110101011", "01110101112")
      println("TEST-5...${result}")
      
      result = driver("VTtNu", "Wsmc", "469530")
      println("TEST-6...${result}")
      
      result = driver("2317170", "898421173423", "898423490593")
      println("TEST-7...${result}")
      
      result = driver("111111000010", "01100001110111", "01211112110121")
      println("TEST-8...${result}")
      
      result = driver("Ktt", "CTbbVX wGBkE", "2315420138859")
      println("TEST-9...${result}")
      
          
  }
  
  main()
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;
  }