title: Sum Two Large Numbers
signature: sum_two_large_numbers <- function(str1, str2) {
test_code: 
  
  
  # SOLUTION CODE
  # ============================================
  PLACEHOLDER_CODE_BODY
  
  # TESTING CODE 
  # ============================================
  validate_solution <- function(actual, expected) {
      toString(actual)==toString(expected)
  }
  
  driver <- function(str1, str2, expected){
      if (validate_solution(PLACEHOLDER_FN_NAME(str1, str2), expected)){
          "PASSED"
      } else{
          "FAILED"
      }
  }
  
  main <- function() {
      cat(sprintf("TEST-0...%s\n",driver(
          "VkfzrPG", "rKZ", 
          "44527855"
      )))
  
      cat(sprintf("TEST-1...%s\n",driver(
          "0526110506447", "903", 
          "0526110507350"
      )))
  
      cat(sprintf("TEST-2...%s\n",driver(
          "011010010", "110100000", 
          "121110010"
      )))
  
      cat(sprintf("TEST-3...%s\n",driver(
          "sPAwZACc ", "liYMsojPiinOV", 
          "66153436372942"
      )))
  
      cat(sprintf("TEST-4...%s\n",driver(
          "3", "611", 
          "614"
      )))
  
      cat(sprintf("TEST-5...%s\n",driver(
          "0101", "01110101011", 
          "01110101112"
      )))
  
      cat(sprintf("TEST-6...%s\n",driver(
          "VTtNu", "Wsmc", 
          "469530"
      )))
  
      cat(sprintf("TEST-7...%s\n",driver(
          "2317170", "898421173423", 
          "898423490593"
      )))
  
      cat(sprintf("TEST-8...%s\n",driver(
          "111111000010", "01100001110111", 
          "01211112110121"
      )))
  
      cat(sprintf("TEST-9...%s\n",driver(
          "Ktt", "CTbbVX wGBkE", 
          "2315420138859"
      )))
  
  }
  
  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;
  }