Language: C++

#include<bits/stdc++.h>
using namespace std;
int main(){
  int xx[4]={-1,1,0,0};
  int yy[4]={0,0,-1,1};
  int h,w;cin>>h>>w;
  string s[h];
  for(int i=0;i<h;i++) cin>>s[i];
  int cnt=0;
  for(int i=0;i<h;i++){
    for(int j=0;j<w;j++){
      if(s[i][j]=='.') cnt++;
    }
  }
  queue<int>qx;
  queue<int>qy;
  queue<int>qn;
  qn.push(0);
  qx.push(0);qy.push(0);
  while(qx.size()>0){
    int x=qx.front();
    int y=qy.front();
    int n=qn.front();
    if(qx==w-1&&qy==h-1){
      cout<<cnt-n<<endl;
      return 0;
    }
    qn.pop();
    qx.pop();qy.pop();
    for(int i=0;i<4;i++){
      if(s[y+yy[i]][x+xx[i]]=='.'){
        qx.push(x+xx[i]);qy.push(y+yy[i]);qn.push(n+1);
      }
    }
  }
  cout<<-1<<endl;
}
    

Compiler output:
a.cc: In function 'int main()':
a.cc:24:10: error: no match for 'operator==' (operand types are 'std::queue<int>' and 'int')
   24 |     if(qx==w-1&&qy==h-1){
      |        ~~^~~~~
      |        |    |
      |        |    int
      |        std::queue<int>
In file included from /usr/include/c++/14/regex:68,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:181,
                 from a.cc:1:
/usr/include/c++/14/bits/regex.h:1103:5: note: candidate: 'template<class _BiIter> bool std::__cxx11::operator==(const sub_match<_BiIter>&, const sub_match<_BiIter>&)'
 1103 |     operator==(const sub_match<_BiIter>& __lhs, const sub_match<_BiIter>& __rhs)
      |     ^~~~~~~~
/usr/include/c++/14/bits/regex.h:1103:5: note:   template argument deduction/substitution failed:
a.cc:24:14: note:   'std::queue<int>' is not derived from 'const std::__cxx11::sub_match<_BiIter>'
   24 |     if(qx==w-1&&qy==h-1){
      |              ^
/usr/include/c++/14/bits/regex.h:1199:5: note: candidate: 'template<class _Bi_iter, class _Ch_traits, class _Ch_alloc> bool std::__cxx11::operator==(__sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>&, const sub_match<_BiIter>&)'
 1199 |     operator==(const __sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/regex.h:1199:5: note:   template argument deduction/substitution failed:
a.cc:24:14: note:   'std::queue<int>' is not derived from 'std::__cxx11::__sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>'
   24 |     if(qx==w-1&&qy==h-1){
      |              ^
/usr/include/c++/14/bits/regex.h:1274:5: note: candidate: 'template<class _Bi_iter, class _Ch_traits, class _Ch_alloc> bool std::__cxx11::operator==(const sub_match<_BiIter>&, __sub_match_string<_Bi_iter, _Ch_traits, _Ch_alloc>&)'
 1274 |     operator==(const sub_match<_Bi_iter>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/regex.h:1274:5: note:   template argument deduction/substitution failed:
a.cc:24:14: note:   'std::queue<int>' is not derived from 'const std::__cxx11::sub_match<_BiIter>'
   24 |     if(qx==w-1&&qy==h-1){
      |              ^
/usr/include/c++/14/bits/regex.h:1366:5: note: candidate: 'template<class _Bi_iter> bool std::__cxx11::operator==(const typename std::iterator_traits<_Iter>::value_type*, const sub_match<_BiIter>&)'
 1366 |     operator==(typename iterator_traits<_Bi_iter>::value_type const* __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/regex.h:1366:5: note:   template argument deduction/substitution failed:
a.cc:24:14: note:   mismatched types 'const std::__cxx11::sub_match<_BiIter>' and 'int'
   24 |     if(qx==w-1&&qy==h-1){
      |              ^
/usr/include/c++/14/bits/regex.h:1441:5: note: candidate: 'template<class _Bi_iter> bool std::__cxx11::operator==(const sub_match<_BiIter>&, const typename std::iterator_traits<_Iter>::value_type*)'
 1441 |     operator==(const sub_match<_Bi_iter>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/regex.h:1441:5: note:   template argument deduction/substitution failed:
a.cc:24:14: note:   'std::queue<int>' is not derived from 'const std::__cxx11::sub_match<_BiIter>'
   24 |     if(qx==w-1&&qy==h-1){
      |              ^
/usr/include/c++/14/bits/regex.h:1534:5: note: candidate: 'template<class _Bi_iter> bool std::__cxx11::operator==(const typename std::iterator_traits<_Iter>::value_type&, const sub_match<_BiIter>&)'
 1534 |     operator==(typename iterator_traits<_Bi_iter>::value_type const& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/regex.h:1534:5: note:   template argument deduction/substitution failed:
a.cc:24:14: note:   mismatched types 'const std::__cxx11::sub_match<_BiIter>' and 'int'
   24 |     if(qx==w-1&&qy==h-1){
      |              ^
/usr/include/c++/14/bits/regex.h:1613:5: note: candidate: 'template<class _Bi_iter> bool std::__cxx11::operator==(const sub_match<_BiIter>&, const typename std::iterator_traits<_Iter>::value_type&)'
 1613 |     operator==(const sub_match<_Bi_iter>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/14/bits/regex.h:1613:5: note:   template argument deduction/substitution failed:
a.cc:24:14: note:   'std::queue<int>' is not derived from 'const std::__cxx11::sub_match<_BiIter>'
   24 |     if(qx==w-1&&qy==h-1){
      |              ^
/usr/include/c++/14/bits/regex.h:2186:5: note: candidate: 'template<class _Bi_iter, class _Alloc> bool std::__cxx11::operator==(const match_results<_BiIter, _Alloc>&, const match_results<_BiIter, _Alloc>&)'
 2186 |     operator==(const match_results<_Bi_iter, _Alloc>& __m1,
      |     ^~~~~~~~
/usr/include/c++/14/bits/regex.h:2186:5: note:   template argument deduction/substitution failed:
a.cc:24:14: note:   'std::queue<int>' is not derived from 'const std::__cxx11::match_results<_BiIter, _Alloc>'
   24 |     if(qx==w-1&&qy==h-1){
      |              ^
In file included from /usr/include/c++/14/bits/stl_algobase.h:64,
                 from /usr/include/c++/14/algorithm:60,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:51:
/usr/include/c++/14/bits/stl_pair.h:1033:5: note: candidate: 'template<class _T1, class _T2> constexpr bool std::operator==(const pair<_T1, _T2>&, const pair<_T1, _T2>&)'
 1033 |     operator==(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y)
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_pair.h:1033:5: note:   template argument deduction/substitution failed:
a.cc:24:14: note:   'std::queue<int>' is not derived from 'const std::pair<_T1, _T2>'
   24 |     if(qx==w-1&&qy==h-1){
      |              ^
In file included from /usr/include/c++/14/bits/stl_algobase.h:67:
/usr/include/c++/14/bits/stl_iterator.h:441:5: note: candidate: 'template<class _Iterator> constexpr bool std::operator==(const reverse_iterator<_Iterator>&, const reverse_iterator<_Iterator>&)'
  441 |     operator==(const reverse_iterator<_Iterator>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:441:5: note:   template argument deduction/substitution failed:
a.cc:24:14: note:   'std::queue<int>' is not derived from 'const std::reverse_iterator<_Iterator>'
   24 |     if(qx==w-1&&qy==h-1){
      |              ^
/usr/include/c++/14/bits/stl_iterator.h:486:5: note: candidate: 'template<class _IteratorL, class _IteratorR> constexpr bool std::operator==(const reverse_iterator<_Iterator>&, const reverse_iterator<_IteratorR>&)'
  486 |     operator==(const reverse_iterator<_IteratorL>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:486:5: note:   template argument deduction/substitution failed:
a.cc:24:14: note:   'std::queue<int>' is not derived from 'const std::reverse_iterator<_Iterator>'
   24 |     if(qx==w-1&&qy==h-1){
      |              ^
/usr/include/c++/14/bits/stl_iterator.h:1667:5: note: candidate: 'template<class _IteratorL, class _IteratorR> constexpr bool std::operator==(const move_iterator<_IteratorL>&, const move_iterator<_IteratorR>&)'
 1667 |     operator==(const move_iterator<_IteratorL>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:1667:5: note:   template argument deduction/substitution failed:
a.cc:24:14: note:   'std::queue<int>' is not derived from 'const std::move_iterator<_IteratorL>'
   24 |     if(qx==w-1&&qy==h-1){
      |              ^
/usr/include/c++/14/bits/stl_iterator.h:1737:5: note: candidate: 'template<class _Iterator> constexpr bool std::operator==(const move_iterator<_IteratorL>&, const move_iterator<_IteratorL>&)'
 1737 |     operator==(const move_iterator<_Iterator>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:1737:5: note:   template argument deduction/substitution failed:
a.cc:24:14: note:   'std::queue<int>' is not derived from 'const std::move_iterator<_IteratorL>'
   24 |     if(qx==w-1&&qy==h-1){
      |              ^
In file included from /usr/include/c++/14/bits/char_traits.h:42,
                 from /usr/include/c++/14/string:42,
                 from /usr/include/c++/14/bitset:52,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:52:
/usr/include/c++/14/bits/postypes.h:192:5: note: candidate: 'template<class _StateT> bool std::operator==(const fpos<_StateT>&, const fpos<_StateT>&)'
  192 |     operator==(const fpos<_StateT>& __lhs, const fpos<_StateT>& __rhs)
      |     ^~~~~~~~
/usr/include/c++/14/bits/postypes.h:192:5: note:   template argument deduction/substitution failed:
a.cc:24:14: note:   'std::queue<int>' is not derived from 'const std::fpos<_StateT>'
   24 |     if(qx==w-1&&qy==h-1){
      |              ^
In file included from /usr/include/c++/14/string:43:
/usr/include/c++/14/bits/allocator.h:235:5: note: candidate: 'template<class _T1, class _T2> bool std::operator==(const allocator<_CharT>&, const allocator<_T2>&)'
  235 |     operator==(const allocator<_T1>&, const allocator<_T2>&)
      |     ^~~~~~~~
/usr/include/c++/14/bits/allocator.h:235:5: note:   template argument deduction/substitution failed:
a.cc:24:14: note:   'std::queue<int>' is not derived from 'const std::allocator<_CharT>'
   24 |     if(qx==w-1&&qy==h-1){
      |              ^
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:629:5: note: candidate: 'template<class _CharT, class _Traits> constexpr bool std::operator==(basic_string_view<_CharT, _Traits>, __type_identity_t<basic_string_view<_CharT, _Traits> >)'
  629 |     operator==(basic_string_view<_CharT, _Traits> __x,
      |     ^~~~~~~~
/usr/include/c++/14/string_view:629:5: note:   template argument deduction/substitution failed:
a.cc:24:14: note:   'std::queue<int>' is not derived from 'std::basic_string_view<_CharT, _Traits>'
   24 |     if(qx==w-1&&qy==h-1){
      |              ^
/usr/include/c++/14/string_view:637:5: note: candidate: 'template<class _CharT, class _Traits> constexpr bool std::operator==(basic_string_view<_CharT, _Traits>, basic_string_view<_CharT, _Traits>)'
  637 |     operator==(basic_string_view<_CharT, _Traits> __x,
      |     ^~~~~~~~
/usr/include/c++/14/string_view:637:5: note:   template argument deduction/substitution failed:
a.cc:24:14: note:   'std::queue<int>' is not derived from 'std::basic_string_