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#include <iostream>
#include <string>
using namespace std;
 
 
std::string & ltrim(std::string & str)
{
  auto it2 =  std::find_if( str.begin() , str.end() , [](char ch){ return !std::isspace<char>(ch , std::locale::classic() ) ; } );
  str.erase( str.begin() , it2);
  return str;   
}
 
std::string & rtrim(std::string & str)
{
  auto it1 =  std::find_if( str.rbegin() , str.rend() , [](char ch){ return !std::isspace<char>(ch , std::locale::classic() ) ; } );
  str.erase( it1.base() , str.end() );
  return str;   
}
 
string add(string n1, string n2)
{
	string sum = "";
 
	int temp;
	int len;
	int carry = 0;
 
	int diff = n1.length() - n2.length();
 
	if (diff == 0)
		len = n1.length();
	else if (diff > 0)
		len = n2.length();
	else
		len = n1.length();
 
	for (int i = 0; i<len; i++)
	{
		temp = n1[i] + n2[i] - 2 * '0' + carry;
 
		if (temp > 9) {
			sum += (temp % 10) + '0';
			carry = 1;
		}
		else {
			sum += temp + '0';
			carry = 0;
		}
	}
 
	if (len < n1.length())
	{
		for (int i = len; i< n1.length(); i++)
		{
			temp = n1[i] + carry - '0';
 
			if (temp > 9) {
				sum += (temp % 10) + '0';
 
				carry = 1;
			}
			else {
				sum += temp + '0';
				carry = 0;
			}
		}
	}
	else if (len > n1.length())
	{
		for (int i = len; i< n2.length(); i++)
		{
			temp = n2[i] + carry - '0';
 
			if (temp > 9) {
				sum += (temp % 10) - '0';
				carry = 1;
			}
			else {
				sum += temp + '0';
				carry = 0;
			}
		}
	}
 
 
 
	if (carry)
		return sum + '1';
	else
		return sum;
 
	return ltrim(rtrim("0"));
}
 
int main() {
 
	int n;
	string n1, n2;
 
	cin >> n;
 
	while (n>0)
	{
		cin >> n1;
		cin >> n2;
 
		n--;
 
		cout << add(n1, n2) << endl;
	}
 
 
	return 0;
}

prog.cpp: In function 'std::string& ltrim(std::string&)':
prog.cpp:8: error: ISO C++ forbids declaration of 'it2' with no type
prog.cpp:8: error: 'find_if' is not a member of 'std'
prog.cpp:8: error: expected primary-expression before '[' token
prog.cpp:8: error: expected primary-expression before ']' token
prog.cpp:8: error: expected primary-expression before 'char'
prog.cpp:9: error: no matching function for call to 'std::basic_string<char, std::char_traits<char>, std::allocator<char> >::erase(__gnu_cxx::__normal_iterator<char*, std::basic_string<char, std::char_traits<char>, std::allocator<char> > >, int&)'
/usr/include/c++/4.3/bits/basic_string.h:1131: note: candidates are: std::basic_string<_CharT, _Traits, _Alloc>& std::basic_string<_CharT, _Traits, _Alloc>::erase(typename _Alloc::rebind<_CharT>::other::size_type, typename _Alloc::rebind<_CharT>::other::size_type) [with _CharT = char, _Traits = std::char_traits<char>, _Alloc = std::allocator<char>]
/usr/include/c++/4.3/bits/basic_string.h:1147: note:                 __gnu_cxx::__normal_iterator<typename _Alloc::rebind<_CharT>::other::pointer, std::basic_string<_CharT, _Traits, _Alloc> > std::basic_string<_CharT, _Traits, _Alloc>::erase(__gnu_cxx::__normal_iterator<typename _Alloc::rebind<_CharT>::other::pointer, std::basic_string<_CharT, _Traits, _Alloc> >) [with _CharT = char, _Traits = std::char_traits<char>, _Alloc = std::allocator<char>]
/usr/include/c++/4.3/bits/basic_string.h:1167: note:                 __gnu_cxx::__normal_iterator<typename _Alloc::rebind<_CharT>::other::pointer, std::basic_string<_CharT, _Traits, _Alloc> > std::basic_string<_CharT, _Traits, _Alloc>::erase(__gnu_cxx::__normal_iterator<typename _Alloc::rebind<_CharT>::other::pointer, std::basic_string<_CharT, _Traits, _Alloc> >, __gnu_cxx::__normal_iterator<typename _Alloc::rebind<_CharT>::other::pointer, std::basic_string<_CharT, _Traits, _Alloc> >) [with _CharT = char, _Traits = std::char_traits<char>, _Alloc = std::allocator<char>]
prog.cpp: In function 'std::string& rtrim(std::string&)':
prog.cpp:15: error: ISO C++ forbids declaration of 'it1' with no type
prog.cpp:15: error: 'find_if' is not a member of 'std'
prog.cpp:15: error: expected primary-expression before '[' token
prog.cpp:15: error: expected primary-expression before ']' token
prog.cpp:15: error: expected primary-expression before 'char'
prog.cpp:16: error: request for member 'base' in 'it1', which is of non-class type 'int'
prog.cpp: In function 'std::string add(std::string, std::string)':
prog.cpp:92: error: invalid initialization of non-const reference of type 'std::string&' from a temporary of type 'const char*'
prog.cpp:13: error: in passing argument 1 of 'std::string& rtrim(std::string&)'

Standard output is empty