Language: C++

#include<iostream>
#include<cstdio>
#include<cmath>
#include<cstring>
#include<string>
#include<stack>
#include<queue>
#include<vector>
#include<algorithm>
#include<iomanip>
typedef long long int ll;
using namespace std;
#define FOR(i,a,b) for (int i=(a);i<(b);i++)
#define REP(i,n) for (unsigned int i=0;i<(n);i++)
#define EREP(i,n) for (int i=1;i<=(n);i++)
#define ALL(a) (a).begin(),(a).end()
//#define EVEL 1

#ifdef EVEL
#define DEB(X) cout << #X << ":" <<X<<" " ;
#define TF(f) f ? cout<<"true  " : cout<<"false ";
#define END cout<<"\n";
#else
#define DEB(X) {}
#define TF(f) {}
#define END {}
#endif
const int MOD =  1000000007 ;
const int INF = 2000000000;


    string A,B,C,D;
    string S,T;
int main(){
    cin>>A>>B;
    C="1";
    REP(i,A)B+="00",C+="00";
    if(stoi(B)%stoi(C)!=0)cout<<B;
    else {cout<<stoi(B)+stoi(C);}
    return 0;

}


Compiler output:
a.cc: In function 'int main()':
a.cc:14:41: error: no match for 'operator<' (operand types are 'unsigned int' and 'std::string' {aka 'std::__cxx11::basic_string<char>'})
   14 | #define REP(i,n) for (unsigned int i=0;i<(n);i++)
      |                                         ^~~~
a.cc:37:5: note: in expansion of macro 'REP'
   37 |     REP(i,A)B+="00",C+="00";
      |     ^~~
In file included from /usr/include/c++/14/string:48,
                 from /usr/include/c++/14/bits/locale_classes.h:40,
                 from /usr/include/c++/14/bits/ios_base.h:41,
                 from /usr/include/c++/14/ios:44,
                 from /usr/include/c++/14/ostream:40,
                 from /usr/include/c++/14/iostream:41,
                 from a.cc:1:
/usr/include/c++/14/bits/stl_iterator.h:448:5: note: candidate: 'template<class _Iterator> constexpr bool std::operator<(const reverse_iterator<_Iterator>&, const reverse_iterator<_Iterator>&)'
  448 |     operator<(const reverse_iterator<_Iterator>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:448:5: note:   template argument deduction/substitution failed:
a.cc:14:44: note:   mismatched types 'const std::reverse_iterator<_Iterator>' and 'unsigned int'
   14 | #define REP(i,n) for (unsigned int i=0;i<(n);i++)
      |                                            ^
a.cc:37:5: note: in expansion of macro 'REP'
   37 |     REP(i,A)B+="00",C+="00";
      |     ^~~
/usr/include/c++/14/bits/stl_iterator.h:493:5: note: candidate: 'template<class _IteratorL, class _IteratorR> constexpr bool std::operator<(const reverse_iterator<_Iterator>&, const reverse_iterator<_IteratorR>&)'
  493 |     operator<(const reverse_iterator<_IteratorL>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:493:5: note:   template argument deduction/substitution failed:
a.cc:14:44: note:   mismatched types 'const std::reverse_iterator<_Iterator>' and 'unsigned int'
   14 | #define REP(i,n) for (unsigned int i=0;i<(n);i++)
      |                                            ^
a.cc:37:5: note: in expansion of macro 'REP'
   37 |     REP(i,A)B+="00",C+="00";
      |     ^~~
/usr/include/c++/14/bits/stl_iterator.h:1694:5: note: candidate: 'template<class _IteratorL, class _IteratorR> constexpr bool std::operator<(const move_iterator<_IteratorL>&, const move_iterator<_IteratorR>&)'
 1694 |     operator<(const move_iterator<_IteratorL>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:1694:5: note:   template argument deduction/substitution failed:
a.cc:14:44: note:   mismatched types 'const std::move_iterator<_IteratorL>' and 'unsigned int'
   14 | #define REP(i,n) for (unsigned int i=0;i<(n);i++)
      |                                            ^
a.cc:37:5: note: in expansion of macro 'REP'
   37 |     REP(i,A)B+="00",C+="00";
      |     ^~~
/usr/include/c++/14/bits/stl_iterator.h:1760:5: note: candidate: 'template<class _Iterator> constexpr bool std::operator<(const move_iterator<_IteratorL>&, const move_iterator<_IteratorL>&)'
 1760 |     operator<(const move_iterator<_Iterator>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:1760:5: note:   template argument deduction/substitution failed:
a.cc:14:44: note:   mismatched types 'const std::move_iterator<_IteratorL>' and 'unsigned int'
   14 | #define REP(i,n) for (unsigned int i=0;i<(n);i++)
      |                                            ^
a.cc:37:5: note: in expansion of macro 'REP'
   37 |     REP(i,A)B+="00",C+="00";
      |     ^~~
In file included from /usr/include/c++/14/bits/stl_algobase.h:64,
                 from /usr/include/c++/14/string:51:
/usr/include/c++/14/bits/stl_pair.h:1045:5: note: candidate: 'template<class _T1, class _T2> constexpr bool std::operator<(const pair<_T1, _T2>&, const pair<_T1, _T2>&)'
 1045 |     operator<(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y)
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_pair.h:1045:5: note:   template argument deduction/substitution failed:
a.cc:14:44: note:   mismatched types 'const std::pair<_T1, _T2>' and 'unsigned int'
   14 | #define REP(i,n) for (unsigned int i=0;i<(n);i++)
      |                                            ^
a.cc:37:5: note: in expansion of macro 'REP'
   37 |     REP(i,A)B+="00",C+="00";
      |     ^~~
In file included from /usr/include/c++/14/bits/basic_string.h:47,
                 from /usr/include/c++/14/string:54:
/usr/include/c++/14/string_view:673:5: note: candidate: 'template<class _CharT, class _Traits> constexpr bool std::operator<(basic_string_view<_CharT, _Traits>, basic_string_view<_CharT, _Traits>)'
  673 |     operator< (basic_string_view<_CharT, _Traits> __x,
      |     ^~~~~~~~
/usr/include/c++/14/string_view:673:5: note:   template argument deduction/substitution failed:
a.cc:14:44: note:   mismatched types 'std::basic_string_view<_CharT, _Traits>' and 'unsigned int'
   14 | #define REP(i,n) for (unsigned int i=0;i<(n);i++)
      |                                            ^
a.cc:37:5: note: in expansion of macro 'REP'
   37 |     REP(i,A)B+="00",C+="00";
      |     ^~~
/usr/include/c++/14/string_view:680:5: note: candidate: 'template<class _CharT, class _Traits> constexpr bool std::operator<(basic_string_view<_CharT, _Traits>, __type_identity_t<basic_string_view<_CharT, _Traits> >)'
  680 |     operator< (basic_string_view<_CharT, _Traits> __x,
      |     ^~~~~~~~
/usr/include/c++/14/string_view:680:5: note:   template argument deduction/substitution failed:
a.cc:14:44: note:   mismatched types 'std::basic_string_view<_CharT, _Traits>' and 'unsigned int'
   14 | #define REP(i,n) for (unsigned int i=0;i<(n);i++)
      |                                            ^
a.cc:37:5: note: in expansion of macro 'REP'
   37 |     REP(i,A)B+="00",C+="00";
      |     ^~~
/usr/include/c++/14/string_view:688:5: note: candidate: 'template<class _CharT, class _Traits> constexpr bool std::operator<(__type_identity_t<basic_string_view<_CharT, _Traits> >, basic_string_view<_CharT, _Traits>)'
  688 |     operator< (__type_identity_t<basic_string_view<_CharT, _Traits>> __x,
      |     ^~~~~~~~
/usr/include/c++/14/string_view:688:5: note:   template argument deduction/substitution failed:
a.cc:14:44: note:   'std::__cxx11::basic_string<char>' is not derived from 'std::basic_string_view<_CharT, _Traits>'
   14 | #define REP(i,n) for (unsigned int i=0;i<(n);i++)
      |                                            ^
a.cc:37:5: note: in expansion of macro 'REP'
   37 |     REP(i,A)B+="00",C+="00";
      |     ^~~
/usr/include/c++/14/bits/basic_string.h:3874:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> bool std::operator<(const __cxx11::basic_string<_CharT, _Traits, _Allocator>&, const __cxx11::basic_string<_CharT, _Traits, _Allocator>&)'
 3874 |     operator<(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3874:5: note:   template argument deduction/substitution failed:
a.cc:14:44: note:   mismatched types 'const std::__cxx11::basic_string<_CharT, _Traits, _Allocator>' and 'unsigned int'
   14 | #define REP(i,n) for (unsigned int i=0;i<(n);i++)
      |                                            ^
a.cc:37:5: note: in expansion of macro 'REP'
   37 |     REP(i,A)B+="00",C+="00";
      |     ^~~
/usr/include/c++/14/bits/basic_string.h:3888:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> bool std::operator<(const __cxx11::basic_string<_CharT, _Traits, _Allocator>&, const _CharT*)'
 3888 |     operator<(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3888:5: note:   template argument deduction/substitution failed:
a.cc:14:44: note:   mismatched types 'const std::__cxx11::basic_string<_CharT, _Traits, _Allocator>' and 'unsigned int'
   14 | #define REP(i,n) for (unsigned int i=0;i<(n);i++)
      |                                            ^
a.cc:37:5: note: in expansion of macro 'REP'
   37 |     REP(i,A)B+="00",C+="00";
      |     ^~~
/usr/include/c++/14/bits/basic_string.h:3901:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> bool std::operator<(const _CharT*, const __cxx11::basic_string<_CharT, _Traits, _Allocator>&)'
 3901 |     operator<(const _CharT* __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/basic_string.h:3901:5: note:   template argument deduction/substitution failed:
a.cc:14:44: note:   mismatched types 'const _CharT*' and 'unsigned int'
   14 | #define REP(i,n) for (unsigned int i=0;i<(n);i++)
      |                                            ^
a.cc:37:5: note: in expansion of macro 'REP'
   37 |     REP(i,A)B+="00",C+="00";
      |     ^~~
In file included from /usr/include/c++/14/bits/memory_resource.h:47,
                 from /usr/include/c++/14/string:68:
/usr/include/c++/14/tuple:2600:5: note: candidate: 'template<class ... _TElements, class ... _UElements> constexpr bool std::operator<(const tuple<_UTypes ...>&, const tuple<_Elements ...>&)'
 2600 |     operator<(const tuple<_TElements...>& __t,
      |     ^~~~~~~~
/usr/include/c++/14/tuple:2600:5: note:   template argument deduction/substitution failed:
a.cc:14:44: note:   mismatched types 'const std::tuple<_UTypes ...>' and 'unsigned int'
   14 | #define REP(i,n) for (unsigned int i=0;i<(n);i++)
      |                                            ^
a.cc:37:5: note: in expansion of macro 'REP'
   37 |     REP(i,A)B+="00",C+="00";
      |     ^~~
In file included from /usr/include/c++/14/deque:66,
                 from /usr/include/c++/14/stack:62,
                 from a.cc:6:
/usr/include/c++/14/bits/stl_deque.h:2334:5: note: candidate: 'template<class _Tp, class _Alloc> bool std::operator<(const deque<_Tp, _Alloc>&, const deque<_Tp, _Alloc>&)'
 2334 |     operator<(const deque<_Tp, _Alloc>& __x, const deque<_Tp, _Alloc>& __y)
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_deque.h:2334:5: note:   template argument deduction/substitution failed:
a.cc:14:44: note:   mismatched types 'const std::deque<_Tp, _Alloc>' and 'unsigned int'
   14 | #define REP(i,n) for (unsigned int i=0;i<(n);i++)
      |                                            ^
a.