Language: C++

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


//YYMM, MMYY
bool poss[2];
string s;

int main(){
ios_base::sync_with_stdio(false);
cin >> s;

if(stoi(string() + s[0] + s[1]) > 12 && string() + s[0] + s[1]) != 0){
    poss[0] = true;
}
if(stoi(string() + s[0] + s[1]) > 31 && string() + s[0] + s[1]) != 0){
    poss[1] = true;
}
if(stoi(string() + s[2] + s[3]) > 12 && string() + s[0] + s[1]) != 0){
    poss[1] = true;
}
if(stoi(string() + s[3] + s[4]) > 31 && string() + s[0] + s[1]) != 0){
    poss[2] = true;
}

if(!poss[0] && !poss[1]) cout << "AMBIGUOUS";
if(poss[0] && !poss[1]) cout << "YYMM";
if(!poss[0] && poss[1]) cout << "MMYY";
if(poss[0] && poss[1]) cout << "NA";
cin >> s;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:13:38: error: no match for 'operator&&' (operand types are 'bool' and 'std::__cxx11::basic_string<char>')
   13 | if(stoi(string() + s[0] + s[1]) > 12 && string() + s[0] + s[1]) != 0){
      |    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ^~
      |                                 |
      |                                 bool
a.cc:13:38: note: candidate: 'operator&&(bool, bool)' (built-in)
   13 | if(stoi(string() + s[0] + s[1]) > 12 && string() + s[0] + s[1]) != 0){
a.cc:13:38: note:   no known conversion for argument 2 from 'std::__cxx11::basic_string<char>' to 'bool'
In file included from /usr/include/c++/14/valarray:605,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:166,
                 from a.cc:1:
/usr/include/c++/14/bits/valarray_after.h:415:5: note: candidate: 'template<class _Dom1, class _Dom2> std::_Expr<std::__detail::_BinClos<std::__logical_and, std::_Expr, std::_Expr, _Dom1, _Dom2>, typename std::__fun<std::__logical_and, typename _Dom1::value_type>::result_type> std::operator&&(const _Expr<_Dom1, typename _Dom1::value_type>&, const _Expr<_Dom2, typename _Dom2::value_type>&)'
  415 |     _DEFINE_EXPR_BINARY_OPERATOR(&&, struct std::__logical_and)
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/valarray_after.h:415:5: note:   template argument deduction/substitution failed:
a.cc:13:62: note:   mismatched types 'const std::_Expr<_Dom1, typename _Dom1::value_type>' and 'bool'
   13 | if(stoi(string() + s[0] + s[1]) > 12 && string() + s[0] + s[1]) != 0){
      |                                                              ^
/usr/include/c++/14/bits/valarray_after.h:415:5: note: candidate: 'template<class _Dom> std::_Expr<std::__detail::_BinClos<std::__logical_and, std::_Expr, std::_Constant, _Dom, typename _Dom::value_type>, typename std::__fun<std::__logical_and, typename _Dom1::value_type>::result_type> std::operator&&(const _Expr<_Dom1, typename _Dom1::value_type>&, const typename _Dom::value_type&)'
  415 |     _DEFINE_EXPR_BINARY_OPERATOR(&&, struct std::__logical_and)
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/valarray_after.h:415:5: note:   template argument deduction/substitution failed:
a.cc:13:62: note:   mismatched types 'const std::_Expr<_Dom1, typename _Dom1::value_type>' and 'bool'
   13 | if(stoi(string() + s[0] + s[1]) > 12 && string() + s[0] + s[1]) != 0){
      |                                                              ^
/usr/include/c++/14/bits/valarray_after.h:415:5: note: candidate: 'template<class _Dom> std::_Expr<std::__detail::_BinClos<std::__logical_and, std::_Constant, std::_Expr, typename _Dom::value_type, _Dom>, typename std::__fun<std::__logical_and, typename _Dom1::value_type>::result_type> std::operator&&(const typename _Dom::value_type&, const _Expr<_Dom1, typename _Dom1::value_type>&)'
  415 |     _DEFINE_EXPR_BINARY_OPERATOR(&&, struct std::__logical_and)
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/valarray_after.h:415:5: note:   template argument deduction/substitution failed:
a.cc:13:62: note:   'std::__cxx11::basic_string<char>' is not derived from 'const std::_Expr<_Dom1, typename _Dom1::value_type>'
   13 | if(stoi(string() + s[0] + s[1]) > 12 && string() + s[0] + s[1]) != 0){
      |                                                              ^
/usr/include/c++/14/bits/valarray_after.h:415:5: note: candidate: 'template<class _Dom> std::_Expr<std::__detail::_BinClos<std::__logical_and, std::_Expr, std::_ValArray, _Dom, typename _Dom::value_type>, typename std::__fun<std::__logical_and, typename _Dom1::value_type>::result_type> std::operator&&(const _Expr<_Dom1, typename _Dom1::value_type>&, const valarray<typename _Dom::value_type>&)'
  415 |     _DEFINE_EXPR_BINARY_OPERATOR(&&, struct std::__logical_and)
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/valarray_after.h:415:5: note:   template argument deduction/substitution failed:
a.cc:13:62: note:   mismatched types 'const std::_Expr<_Dom1, typename _Dom1::value_type>' and 'bool'
   13 | if(stoi(string() + s[0] + s[1]) > 12 && string() + s[0] + s[1]) != 0){
      |                                                              ^
/usr/include/c++/14/bits/valarray_after.h:415:5: note: candidate: 'template<class _Dom> std::_Expr<std::__detail::_BinClos<std::__logical_and, std::_ValArray, std::_Expr, typename _Dom::value_type, _Dom>, typename std::__fun<std::__logical_and, typename _Dom1::value_type>::result_type> std::operator&&(const valarray<typename _Dom::value_type>&, const _Expr<_Dom1, typename _Dom1::value_type>&)'
  415 |     _DEFINE_EXPR_BINARY_OPERATOR(&&, struct std::__logical_and)
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/valarray_after.h:415:5: note:   template argument deduction/substitution failed:
a.cc:13:62: note:   'std::__cxx11::basic_string<char>' is not derived from 'const std::_Expr<_Dom1, typename _Dom1::value_type>'
   13 | if(stoi(string() + s[0] + s[1]) > 12 && string() + s[0] + s[1]) != 0){
      |                                                              ^
/usr/include/c++/14/valarray:1206:1: note: candidate: 'template<class _Tp> std::_Expr<std::__detail::_BinClos<std::__logical_and, std::_ValArray, std::_ValArray, _Tp, _Tp>, typename std::__fun<std::__logical_and, _Tp>::result_type> std::operator&&(const valarray<_Tp>&, const valarray<_Tp>&)'
 1206 | _DEFINE_BINARY_OPERATOR(&&, __logical_and)
      | ^~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/valarray:1206:1: note:   template argument deduction/substitution failed:
a.cc:13:62: note:   mismatched types 'const std::valarray<_Tp>' and 'bool'
   13 | if(stoi(string() + s[0] + s[1]) > 12 && string() + s[0] + s[1]) != 0){
      |                                                              ^
/usr/include/c++/14/valarray:1206:1: note: candidate: 'template<class _Tp> std::_Expr<std::__detail::_BinClos<std::__logical_and, std::_ValArray, std::_Constant, _Tp, _Tp>, typename std::__fun<std::__logical_and, _Tp>::result_type> std::operator&&(const valarray<_Tp>&, const typename valarray<_Tp>::value_type&)'
 1206 | _DEFINE_BINARY_OPERATOR(&&, __logical_and)
      | ^~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/valarray:1206:1: note:   template argument deduction/substitution failed:
a.cc:13:62: note:   mismatched types 'const std::valarray<_Tp>' and 'bool'
   13 | if(stoi(string() + s[0] + s[1]) > 12 && string() + s[0] + s[1]) != 0){
      |                                                              ^
/usr/include/c++/14/valarray:1206:1: note: candidate: 'template<class _Tp> std::_Expr<std::__detail::_BinClos<std::__logical_and, std::_Constant, std::_ValArray, _Tp, _Tp>, typename std::__fun<std::__logical_and, _Tp>::result_type> std::operator&&(const typename valarray<_Tp>::value_type&, const valarray<_Tp>&)'
 1206 | _DEFINE_BINARY_OPERATOR(&&, __logical_and)
      | ^~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/valarray:1206:1: note:   template argument deduction/substitution failed:
a.cc:13:62: note:   'std::__cxx11::basic_string<char>' is not derived from 'const std::valarray<_Tp>'
   13 | if(stoi(string() + s[0] + s[1]) > 12 && string() + s[0] + s[1]) != 0){
      |                                                              ^
a.cc:13:65: error: expected primary-expression before '!=' token
   13 | if(stoi(string() + s[0] + s[1]) > 12 && string() + s[0] + s[1]) != 0){
      |                                                                 ^~
a.cc:16:38: error: no match for 'operator&&' (operand types are 'bool' and 'std::__cxx11::basic_string<char>')
   16 | if(stoi(string() + s[0] + s[1]) > 31 && string() + s[0] + s[1]) != 0){
      |    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ^~
      |                                 |
      |                                 bool
a.cc:16:38: note: candidate: 'operator&&(bool, bool)' (built-in)
   16 | if(stoi(string() + s[0] + s[1]) > 31 && string() + s[0] + s[1]) != 0){
a.cc:16:38: note:   no known conversion for argument 2 from 'std::__cxx11::basic_string<char>' to 'bool'
/usr/include/c++/14/bits/valarray_after.h:415:5: note: candidate: 'template<class _Dom1, class _Dom2> std::_Expr<std::__detail::_BinClos<std::__logical_and, std::_Expr, std::_Expr, _Dom1, _Dom2>, typename std::__fun<std::__logical_and, typename _Dom1::value_type>::result_type> std::operator&&(const _Expr<_Dom1, typename _Dom1::value_type>&, const _Expr<_Dom2, typename _Dom2::value_type>&)'
  415 |     _DEFINE_EXPR_BINARY_OPERATOR(&&, struct std::__logical_and)
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/valarray_after.h:415:5: note:   template argument deduction/substitution failed:
a.cc:16:62: note:   mismatched types 'const std::_Expr<_Dom1, typename _Dom1::value_type>' and 'bool'
   16 | if(stoi(string() + s[0] + s[1]) > 31 && string() + s[0] + s[1]) != 0){
      |                                                              ^
/usr/include/c++/14/bits/valarray_after.h:415:5: note: candidate: 'template<class _Dom> std::_Expr<std::__detail::_BinClos<std::__logical_and, std::_Expr, std::_Constant, _Dom, typename _Dom::value_type>, typename std::__fun<std::__logical_and, typename _Dom1::value_type>::result_type> std::operator&&(const _Expr<_Dom1, typename _Dom1::value_type>&, const typename _Dom::value_type&)'
  415 |     _DEFINE_EXPR_BINARY_OPERATOR(&&, struct std::__logical_and)
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/valarray_after.h:415:5: note:   template argument deduction/substitution failed:
a.cc:16:62: note:   mismatched types 'const std::_Expr<_Dom1, typename _Dom1::value_type>' and 'bool'
   16 | if(stoi(string() + s[0] + s[1]) > 31 && string() + s[0] + s[1]) != 0){
      |                                                              ^
/usr/include/c++/14/bits/valarray_after.h:415:5: note: candidate: 'template<class _Dom> std::_Expr<std::__detail::_BinClos<std::__logical_and, std::_Constant, std::_Expr, typename _Dom::value_type, _Dom>, typename std::__fun<std::__logical_and, typename _Dom1::value_type>::result_type> std::operator&&(const typename _Dom::value_type&, const _Expr<_Dom1, typename _Dom1::value_type>&)'
  415 |     _DEFINE_EXPR_BINARY_OPERATOR(&&,