Language: C++

#include <bits/stdc++.h>
using namespace std;

int main(){
  int x,y;
  string  num;
  cin >> num;
 
    istringstream a, b,c,d;
  
  a = std::istringstream(num[0]);
  b = std::istringstream(num[1]);
  c = std::istringstream(num[2]);
  d = std::istringstream(num[3]);
  
   x = a*10+b;
   y = c*10+d;
   
  if(x<=12&&y<=12){
    cout << "AMBIGUOUS" <<endl;
  } else if(x<=12){
    cout << "MMYY" << endl;
  } else if(y<=12){
    cout << "YYMM" << endl;
  } else {
    cout << "NA" << endl;
  }
    return 0;
}
  
  


Compiler output:
a.cc: In function 'int main()':
a.cc:11:32: error: invalid conversion from '__gnu_cxx::__alloc_traits<std::allocator<char>, char>::value_type' {aka 'char'} to 'std::ios_base::openmode' [-fpermissive]
   11 |   a = std::istringstream(num[0]);
      |                                ^
      |                                |
      |                                __gnu_cxx::__alloc_traits<std::allocator<char>, char>::value_type {aka char}
In file included from /usr/include/c++/14/complex:45,
                 from /usr/include/c++/14/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:127,
                 from a.cc:1:
/usr/include/c++/14/sstream:597:46: note:   initializing argument 1 of 'std::__cxx11::basic_istringstream<_CharT, _Traits, _Alloc>::basic_istringstream(std::ios_base::openmode) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::ios_base::openmode = std::ios_base::openmode]'
  597 |       basic_istringstream(ios_base::openmode __mode)
      |                           ~~~~~~~~~~~~~~~~~~~^~~~~~
a.cc:12:32: error: invalid conversion from '__gnu_cxx::__alloc_traits<std::allocator<char>, char>::value_type' {aka 'char'} to 'std::ios_base::openmode' [-fpermissive]
   12 |   b = std::istringstream(num[1]);
      |                                ^
      |                                |
      |                                __gnu_cxx::__alloc_traits<std::allocator<char>, char>::value_type {aka char}
/usr/include/c++/14/sstream:597:46: note:   initializing argument 1 of 'std::__cxx11::basic_istringstream<_CharT, _Traits, _Alloc>::basic_istringstream(std::ios_base::openmode) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::ios_base::openmode = std::ios_base::openmode]'
  597 |       basic_istringstream(ios_base::openmode __mode)
      |                           ~~~~~~~~~~~~~~~~~~~^~~~~~
a.cc:13:32: error: invalid conversion from '__gnu_cxx::__alloc_traits<std::allocator<char>, char>::value_type' {aka 'char'} to 'std::ios_base::openmode' [-fpermissive]
   13 |   c = std::istringstream(num[2]);
      |                                ^
      |                                |
      |                                __gnu_cxx::__alloc_traits<std::allocator<char>, char>::value_type {aka char}
/usr/include/c++/14/sstream:597:46: note:   initializing argument 1 of 'std::__cxx11::basic_istringstream<_CharT, _Traits, _Alloc>::basic_istringstream(std::ios_base::openmode) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::ios_base::openmode = std::ios_base::openmode]'
  597 |       basic_istringstream(ios_base::openmode __mode)
      |                           ~~~~~~~~~~~~~~~~~~~^~~~~~
a.cc:14:32: error: invalid conversion from '__gnu_cxx::__alloc_traits<std::allocator<char>, char>::value_type' {aka 'char'} to 'std::ios_base::openmode' [-fpermissive]
   14 |   d = std::istringstream(num[3]);
      |                                ^
      |                                |
      |                                __gnu_cxx::__alloc_traits<std::allocator<char>, char>::value_type {aka char}
/usr/include/c++/14/sstream:597:46: note:   initializing argument 1 of 'std::__cxx11::basic_istringstream<_CharT, _Traits, _Alloc>::basic_istringstream(std::ios_base::openmode) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::ios_base::openmode = std::ios_base::openmode]'
  597 |       basic_istringstream(ios_base::openmode __mode)
      |                           ~~~~~~~~~~~~~~~~~~~^~~~~~
a.cc:16:9: error: no match for 'operator*' (operand types are 'std::istringstream' {aka 'std::__cxx11::basic_istringstream<char>'} and 'int')
   16 |    x = a*10+b;
      |        ~^~~
      |        | |
      |        | int
      |        std::istringstream {aka std::__cxx11::basic_istringstream<char>}
a.cc:16:9: note: candidate: 'operator*(int, int)' (built-in)
   16 |    x = a*10+b;
      |        ~^~~
a.cc:16:9: note:   no known conversion for argument 1 from 'std::istringstream' {aka 'std::__cxx11::basic_istringstream<char>'} to 'int'
/usr/include/c++/14/complex:400:5: note: candidate: 'template<class _Tp> std::complex<_Tp> std::operator*(const complex<_Tp>&, const complex<_Tp>&)'
  400 |     operator*(const complex<_Tp>& __x, const complex<_Tp>& __y)
      |     ^~~~~~~~
/usr/include/c++/14/complex:400:5: note:   template argument deduction/substitution failed:
a.cc:16:10: note:   'std::istringstream' {aka 'std::__cxx11::basic_istringstream<char>'} is not derived from 'const std::complex<_Tp>'
   16 |    x = a*10+b;
      |          ^~
/usr/include/c++/14/complex:409:5: note: candidate: 'template<class _Tp> std::complex<_Tp> std::operator*(const complex<_Tp>&, const _Tp&)'
  409 |     operator*(const complex<_Tp>& __x, const _Tp& __y)
      |     ^~~~~~~~
/usr/include/c++/14/complex:409:5: note:   template argument deduction/substitution failed:
a.cc:16:10: note:   'std::istringstream' {aka 'std::__cxx11::basic_istringstream<char>'} is not derived from 'const std::complex<_Tp>'
   16 |    x = a*10+b;
      |          ^~
/usr/include/c++/14/complex:418:5: note: candidate: 'template<class _Tp> std::complex<_Tp> std::operator*(const _Tp&, const complex<_Tp>&)'
  418 |     operator*(const _Tp& __x, const complex<_Tp>& __y)
      |     ^~~~~~~~
/usr/include/c++/14/complex:418:5: note:   template argument deduction/substitution failed:
a.cc:16:10: note:   mismatched types 'const std::complex<_Tp>' and 'int'
   16 |    x = a*10+b;
      |          ^~
In file included from /usr/include/c++/14/valarray:605,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:166:
/usr/include/c++/14/bits/valarray_after.h:407:5: note: candidate: 'template<class _Dom1, class _Dom2> std::_Expr<std::__detail::_BinClos<std::__multiplies, std::_Expr, std::_Expr, _Dom1, _Dom2>, typename std::__fun<std::__multiplies, typename _Dom1::value_type>::result_type> std::operator*(const _Expr<_Dom1, typename _Dom1::value_type>&, const _Expr<_Dom2, typename _Dom2::value_type>&)'
  407 |     _DEFINE_EXPR_BINARY_OPERATOR(*, struct std::__multiplies)
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/valarray_after.h:407:5: note:   template argument deduction/substitution failed:
a.cc:16:10: note:   'std::istringstream' {aka 'std::__cxx11::basic_istringstream<char>'} is not derived from 'const std::_Expr<_Dom1, typename _Dom1::value_type>'
   16 |    x = a*10+b;
      |          ^~
/usr/include/c++/14/bits/valarray_after.h:407:5: note: candidate: 'template<class _Dom> std::_Expr<std::__detail::_BinClos<std::__multiplies, std::_Expr, std::_Constant, _Dom, typename _Dom::value_type>, typename std::__fun<std::__multiplies, typename _Dom1::value_type>::result_type> std::operator*(const _Expr<_Dom1, typename _Dom1::value_type>&, const typename _Dom::value_type&)'
  407 |     _DEFINE_EXPR_BINARY_OPERATOR(*, struct std::__multiplies)
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/valarray_after.h:407:5: note:   template argument deduction/substitution failed:
a.cc:16:10: note:   'std::istringstream' {aka 'std::__cxx11::basic_istringstream<char>'} is not derived from 'const std::_Expr<_Dom1, typename _Dom1::value_type>'
   16 |    x = a*10+b;
      |          ^~
/usr/include/c++/14/bits/valarray_after.h:407:5: note: candidate: 'template<class _Dom> std::_Expr<std::__detail::_BinClos<std::__multiplies, std::_Constant, std::_Expr, typename _Dom::value_type, _Dom>, typename std::__fun<std::__multiplies, typename _Dom1::value_type>::result_type> std::operator*(const typename _Dom::value_type&, const _Expr<_Dom1, typename _Dom1::value_type>&)'
  407 |     _DEFINE_EXPR_BINARY_OPERATOR(*, struct std::__multiplies)
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/valarray_after.h:407:5: note:   template argument deduction/substitution failed:
a.cc:16:10: note:   mismatched types 'const std::_Expr<_Dom1, typename _Dom1::value_type>' and 'int'
   16 |    x = a*10+b;
      |          ^~
/usr/include/c++/14/bits/valarray_after.h:407:5: note: candidate: 'template<class _Dom> std::_Expr<std::__detail::_BinClos<std::__multiplies, std::_Expr, std::_ValArray, _Dom, typename _Dom::value_type>, typename std::__fun<std::__multiplies, typename _Dom1::value_type>::result_type> std::operator*(const _Expr<_Dom1, typename _Dom1::value_type>&, const valarray<typename _Dom::value_type>&)'
  407 |     _DEFINE_EXPR_BINARY_OPERATOR(*, struct std::__multiplies)
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/valarray_after.h:407:5: note:   template argument deduction/substitution failed:
a.cc:16:10: note:   'std::istringstream' {aka 'std::__cxx11::basic_istringstream<char>'} is not derived from 'const std::_Expr<_Dom1, typename _Dom1::value_type>'
   16 |    x = a*10+b;
      |          ^~
/usr/include/c++/14/bits/valarray_after.h:407:5: note: candidate: 'template<class _Dom> std::_Expr<std::__detail::_BinClos<std::__multiplies, std::_ValArray, std::_Expr, typename _Dom::value_type, _Dom>, typename std::__fun<std::__multiplies, typename _Dom1::value_type>::result_type> std::operator*(const valarray<typename _Dom::value_type>&, const _Expr<_Dom1, typename _Dom1::value_type>&)'
  407 |     _DEFINE_EXPR_BINARY_OPERATOR(*, struct std::__multiplies)
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/valarray_after.h:407:5: note:   template argument deduction/substitution failed:
a.cc:16:10: note:   mismatched types 'const std::_Expr<_Dom1, typename _Dom1::value_type>' and 'int'
   16 |    x = a*10+b;
      |          ^~
/usr/include/c++/14/valarray:1198:1: note: candidate: 'template<class _Tp> std::_Expr<std::__detail::_BinClos<std::__multiplies, std::_ValArray, std::_ValArray, _Tp, _Tp>, typename std::__fun<std::__multiplies, _Tp>::result_type> std::operator*(const valarray<_Tp>&, const valarray<_Tp>&)'
 1198 | _DEFINE_BINARY_OPERATOR(*, __multiplies)
      | ^~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/valarray:1198:1: note:   template argument deduction/substitution failed:
a.cc:16:10: note:   'std::istringstream' {aka 'std::__cxx11::basic_istringstream<char>'} is not