title: Sum Two Large Numbers
signature: string sumTwoLargeNumbers(string str1, string str2) {
test_code: #include <algorithm>
  #include <assert.h>
  #include <cstdlib>
  #include <iostream>
  #include <map>
  #include <set>
  #include <string>
  #include <tuple> 
  #include <unordered_map>
  #include <vector>
  #include <math.h>
  #include <cmath>
  #include <bits/stdc++.h>
  #include <numeric>
  #include <functional>
  
  using namespace std;
  
  // SOLUTION CODE
  // ============================================
  PLACEHOLDER_CODE_BODY
  
  // TESTING CODE 
  // ============================================
  bool validateSolution(string actual, string expected){
      return actual == expected;
  }
  
  string driver(string str1, string str2, string expected){
      try
      {
          if (validateSolution(PLACEHOLDER_FN_NAME(str1, str2), expected)){
              return "PASSED";
          }
          return "FAILED";
      }
      catch (const std::overflow_error& exception_obj)
      {
          return typeid(exception_obj).name();
      }
      catch (const std::runtime_error& exception_obj)
      {
          return typeid(exception_obj).name();
      }
      catch (const std::exception& exception_obj)
      {
          return typeid(exception_obj).name();
      }
      catch (...)
      {
          return "UNK_ERROR";
      }
  }
  
  int main() {
      string result = "";
  
      result = driver("VkfzrPG", "rKZ", "44527855"); 
      cout << "TEST-" << 0 << "..."
           <<  result
           << "\n";
  
      result = driver("0526110506447", "903", "0526110507350"); 
      cout << "TEST-" << 1 << "..."
           <<  result
           << "\n";
  
      result = driver("011010010", "110100000", "121110010"); 
      cout << "TEST-" << 2 << "..."
           <<  result
           << "\n";
  
      result = driver("sPAwZACc ", "liYMsojPiinOV", "66153436372942"); 
      cout << "TEST-" << 3 << "..."
           <<  result
           << "\n";
  
      result = driver("3", "611", "614"); 
      cout << "TEST-" << 4 << "..."
           <<  result
           << "\n";
  
      result = driver("0101", "01110101011", "01110101112"); 
      cout << "TEST-" << 5 << "..."
           <<  result
           << "\n";
  
      result = driver("VTtNu", "Wsmc", "469530"); 
      cout << "TEST-" << 6 << "..."
           <<  result
           << "\n";
  
      result = driver("2317170", "898421173423", "898423490593"); 
      cout << "TEST-" << 7 << "..."
           <<  result
           << "\n";
  
      result = driver("111111000010", "01100001110111", "01211112110121"); 
      cout << "TEST-" << 8 << "..."
           <<  result
           << "\n";
  
      result = driver("Ktt", "CTbbVX wGBkE", "2315420138859"); 
      cout << "TEST-" << 9 << "..."
           <<  result
           << "\n";
  
      return 0;
  }
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;
  }