Language: C++

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define rep(i, n) for(ll i = 0; i < (ll)(n); i++)
#define rep2(i, a, n) for(ll i = a; i < (ll)(n); i++)
#define memi cout << endl
#define kono(n) cout << fixed << setprecision(n)
#define all(c) (c).begin(), (c).end()
#define pb push_back
#define hina cout << ' '
#define in(n) cin >> n
#define in2(n, m) cin >> n >> m
#define in3(n, m, l) cin >> n >> m >> l
#define out(n) cout << n
const ll mei = (ll)1e9 + 7;

int main(){
  ll h, w, s;
  s = 0;
  in(2);
  vector<vector<char>> a(h + 2, vector<ll> (w + 2, '.'));
  rep(i, h){
    rep(j, w)
      in(a[i + 1][j + 1]);
  }
  rep(i, h + 2){
    rep(j, w + 2){
      if(a[i][j] == '#' && a[i - 1][j] == '.' && a[i + 1][j] == '.' && a[i][j - 1] == '.' && a[i][j + 1] == '.')
        a++;
    }
  }
  if(a)
    out("No");
  else
    out("Yes");
  memi;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:11:19: error: no match for 'operator>>' (operand types are 'std::istream' {aka 'std::basic_istream<char>'} and 'int')
   11 | #define in(n) cin >> n
      |               ~~~ ^~
      |               |
      |               std::istream {aka std::basic_istream<char>}
a.cc:20:3: note: in expansion of macro 'in'
   20 |   in(2);
      |   ^~
In file included from /usr/include/c++/14/sstream:40,
                 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/istream:170:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(bool&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  170 |       operator>>(bool& __n)
      |       ^~~~~~~~
/usr/include/c++/14/istream:170:7: note:   conversion of argument 1 would be ill-formed:
a.cc:20:6: error: cannot bind non-const lvalue reference of type 'bool&' to a value of type 'int'
   20 |   in(2);
      |      ^
a.cc:11:22: note: in definition of macro 'in'
   11 | #define in(n) cin >> n
      |                      ^
/usr/include/c++/14/istream:174:7: note: candidate: 'std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>::operator>>(short int&) [with _CharT = char; _Traits = std::char_traits<char>]' (near match)
  174 |       operator>>(short& __n);
      |       ^~~~~~~~
/usr/include/c++/14/istream:174:7: note:   conversion of argument 1 would be ill-formed:
a.cc:20:6: error: cannot bind non-const lvalue reference of type 'short int&' to a value of type 'int'
   20 |   in(2);
      |      ^
a.cc:11:22: note: in definition of macro 'in'
   11 | #define in(n) cin >> n
      |                      ^
/usr/include/c++/14/istream:177:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(short unsigned int&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  177 |       operator>>(unsigned short& __n)
      |       ^~~~~~~~
/usr/include/c++/14/istream:177:7: note:   conversion of argument 1 would be ill-formed:
a.cc:20:6: error: cannot bind non-const lvalue reference of type 'short unsigned int&' to a value of type 'int'
   20 |   in(2);
      |      ^
a.cc:11:22: note: in definition of macro 'in'
   11 | #define in(n) cin >> n
      |                      ^
/usr/include/c++/14/istream:181:7: note: candidate: 'std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>::operator>>(int&) [with _CharT = char; _Traits = std::char_traits<char>]' (near match)
  181 |       operator>>(int& __n);
      |       ^~~~~~~~
/usr/include/c++/14/istream:181:7: note:   conversion of argument 1 would be ill-formed:
a.cc:20:6: error: cannot bind non-const lvalue reference of type 'int&' to an rvalue of type 'int'
   20 |   in(2);
      |      ^
a.cc:11:22: note: in definition of macro 'in'
   11 | #define in(n) cin >> n
      |                      ^
/usr/include/c++/14/istream:184:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(unsigned int&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  184 |       operator>>(unsigned int& __n)
      |       ^~~~~~~~
/usr/include/c++/14/istream:184:7: note:   conversion of argument 1 would be ill-formed:
a.cc:20:6: error: cannot bind non-const lvalue reference of type 'unsigned int&' to a value of type 'int'
   20 |   in(2);
      |      ^
a.cc:11:22: note: in definition of macro 'in'
   11 | #define in(n) cin >> n
      |                      ^
/usr/include/c++/14/istream:188:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(long int&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  188 |       operator>>(long& __n)
      |       ^~~~~~~~
/usr/include/c++/14/istream:188:7: note:   conversion of argument 1 would be ill-formed:
a.cc:20:6: error: cannot bind non-const lvalue reference of type 'long int&' to a value of type 'int'
   20 |   in(2);
      |      ^
a.cc:11:22: note: in definition of macro 'in'
   11 | #define in(n) cin >> n
      |                      ^
/usr/include/c++/14/istream:192:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(long unsigned int&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  192 |       operator>>(unsigned long& __n)
      |       ^~~~~~~~
/usr/include/c++/14/istream:192:7: note:   conversion of argument 1 would be ill-formed:
a.cc:20:6: error: cannot bind non-const lvalue reference of type 'long unsigned int&' to a value of type 'int'
   20 |   in(2);
      |      ^
a.cc:11:22: note: in definition of macro 'in'
   11 | #define in(n) cin >> n
      |                      ^
/usr/include/c++/14/istream:199:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(long long int&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  199 |       operator>>(long long& __n)
      |       ^~~~~~~~
/usr/include/c++/14/istream:199:7: note:   conversion of argument 1 would be ill-formed:
a.cc:20:6: error: cannot bind non-const lvalue reference of type 'long long int&' to a value of type 'int'
   20 |   in(2);
      |      ^
a.cc:11:22: note: in definition of macro 'in'
   11 | #define in(n) cin >> n
      |                      ^
/usr/include/c++/14/istream:203:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(long long unsigned int&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  203 |       operator>>(unsigned long long& __n)
      |       ^~~~~~~~
/usr/include/c++/14/istream:203:7: note:   conversion of argument 1 would be ill-formed:
a.cc:20:6: error: cannot bind non-const lvalue reference of type 'long long unsigned int&' to a value of type 'int'
   20 |   in(2);
      |      ^
a.cc:11:22: note: in definition of macro 'in'
   11 | #define in(n) cin >> n
      |                      ^
/usr/include/c++/14/istream:219:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(float&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  219 |       operator>>(float& __f)
      |       ^~~~~~~~
/usr/include/c++/14/istream:219:7: note:   conversion of argument 1 would be ill-formed:
a.cc:20:6: error: cannot bind non-const lvalue reference of type 'float&' to a value of type 'int'
   20 |   in(2);
      |      ^
a.cc:11:22: note: in definition of macro 'in'
   11 | #define in(n) cin >> n
      |                      ^
/usr/include/c++/14/istream:223:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(double&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  223 |       operator>>(double& __f)
      |       ^~~~~~~~
/usr/include/c++/14/istream:223:7: note:   conversion of argument 1 would be ill-formed:
a.cc:20:6: error: cannot bind non-const lvalue reference of type 'double&' to a value of type 'int'
   20 |   in(2);
      |      ^
a.cc:11:22: note: in definition of macro 'in'
   11 | #define in(n) cin >> n
      |                      ^
/usr/include/c++/14/istream:227:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(long double&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  227 |       operator>>(long double& __f)
      |       ^~~~~~~~
/usr/include/c++/14/istream:227:7: note:   conversion of argument 1 would be ill-formed:
a.cc:20:6: error: cannot bind non-const lvalue reference of type 'long double&' to a value of type 'int'
   20 |   in(2);
      |      ^
a.cc:11:22: note: in definition of macro 'in'
   11 | #define in(n) cin >> n
      |                      ^
/usr/include/c++/14/istream:328:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(void*&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  328 |       operator>>(void*& __p)
      |       ^~~~~~~~
/usr/include/c++/14/istream:328:7: note:   conversion of argument 1 would be ill-formed:
a.cc:20:6: error: invalid conversion from 'int' to 'void*' [-fpermissive]
   20 |   in(2);
      |      ^
      |      |
      |      int
a.cc:11:22: note: in definition of macro 'in'
   11 | #define in(n) cin >> n
      |                      ^
a.cc:20:6: error: cannot bind rvalue '(void*)2' to 'void*&'
   20 |   in(2);
      |      ^
a.cc:11:22: note: in definition of macro 'in'
   11 | #define in(n) cin >> n
      |                      ^
/usr/include/c++/14/istream:122:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(__istream_type& (*)(__istream_type&)) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  122 |       operator>>(__istream_type& (*__pf)(__istream_type&))
      |       ^~~~~~~~
/usr/include/c++/14/istream:122:7: note:   conversion of argument 1 would be ill-formed:
a.cc:20:6: error: invalid conversion from 'int' to 'std::basic_istream<char>::__istream_type& (*)(std::basic_istream<char>::__istream_type&)' {aka 'std::basic_istream<char>& (*)(std::basic_istream<char>&)'} [-fpermissive]
   20 |