title: Sum Two Large Numbers
signature: function sumTwoLargeNumbers(str1: string, str2: string): string {
test_code: 
  
  // SOLUTION CODE
  // ============================================
  PLACEHOLDER_CODE_BODY
  
  // TESTING CODE 
  // ============================================
  function convertToString(value: any): string{
      return JSON.stringify(value, function (key, val) {
          if (val instanceof Set) {
              return Array.from(val);
          } return val;});
  }
  
  function validateSolution(actual: string, expected: string): boolean {
      return convertToString(actual) === convertToString(expected);
  }
  
  function driver(str1: string, str2: string, expected:string): string {
      try{
          if (validateSolution(PLACEHOLDER_FN_NAME(str1, str2),expected)){
              return "PASSED";
          }
          return "FAILED";
      } catch (error) {
        return error.name;
      }
      
  }
      
  function main(){
    let result = '';
    result = driver("VkfzrPG", "rKZ", "44527855");
    console.log(`TEST-0...${result}`);
  
    result = driver("0526110506447", "903", "0526110507350");
    console.log(`TEST-1...${result}`);
  
    result = driver("011010010", "110100000", "121110010");
    console.log(`TEST-2...${result}`);
  
    result = driver("sPAwZACc ", "liYMsojPiinOV", "66153436372942");
    console.log(`TEST-3...${result}`);
  
    result = driver("3", "611", "614");
    console.log(`TEST-4...${result}`);
  
    result = driver("0101", "01110101011", "01110101112");
    console.log(`TEST-5...${result}`);
  
    result = driver("VTtNu", "Wsmc", "469530");
    console.log(`TEST-6...${result}`);
  
    result = driver("2317170", "898421173423", "898423490593");
    console.log(`TEST-7...${result}`);
  
    result = driver("111111000010", "01100001110111", "01211112110121");
    console.log(`TEST-8...${result}`);
  
    result = driver("Ktt", "CTbbVX wGBkE", "2315420138859");
    console.log(`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;
  }