Language: C++

#include <bits/stdc++.h>
using namespace std;
string myif1(int a,int b,string x,string y){
  if(x[a][b]=="#") y[a][b]=="#";
}

string myif2(int a,int b,int c,int d, string x,string y){
  if(x[a][b]=="#") y[c][d]++;
}

int main() {
int h,w;
cin>>h>>w;
string a[h][w];
for(int i=0 ; i<h ; i++){
  vector<string> s(w);
  cin>>s;
  for(int j=0 ; j<w ;j++){
  a[i][j]=s.at(j)
  }
}
  
  string b[h][w];
  for(int i=0 ; i<h ; i++){
    if(i==0){
      for(int j=0 ; j<w ; j++){
if(j==0){
  myif1(0,0,a,b);
  else{
    myif2(0,1,0,0,a,b); myif2(1,0,0,0,a,b); myif2(1,1,0,0,a,b);
  }
}
if(j==w-1){
    myif1(0,w-1,a,b);
    else{
     myif2(0,w-2,0,w-1,a,b); myif2(1,w-2,0,w-1,a,b); myif2(1,w-1,0,w-1,a,b);
    }
  }
  else{
    myif1(i,j,a,b);
    else{
      myif2(i,j-1,i,j,a,b); myif2(i,j+1,i,j,a,b); myif2(i+1,j-1,i,j,a,b);
      myif2(i+1,j,i,j,a,b); myif2(i+1,j+1,i,j,a,b);
    }
  }
      }
  if(i==h-1){
    for(int j=0 ; j<w j++){
      if(j==0){
        myif1(h-1,0,a,b);
        else{
          myif2(i-1,j,i,j,a,b); myif2(i-1,j+1,i,j,a,b); myif2(i,j+1,i,j,a,b);
        }
      }
        if(j==w-1){
          myif1(i,j,a,b);
          else{
            myif2(i-1,j-1,i,j,a,b); myif2(i-1,j,i,j,a,b); myif2(i,j-1,i,j,a,b);
          }
        }
      else {
        myif1(i,j,a,b)
          else{
            myif2(i-1,j-1,i,j,a,b); myif2(i-1,j,i,j,a,b); myif2(i-1,j+1,i,j,a,b);
            myif2(i,j-1,i,j,a,b); myif2(i,j+1,i,j,a,b);
          }
      }
        }
    else{
      for(int j=0 ; j<w ; j++){
        if(j==0){
          myif1(i,j,a,b);
          else{
            myif2(i-1,j,i,j,a,b); myif2(i-1,j+1,i,j,a,b); myif2(i,j+1,i,j,a,b);
            myif2(i+1,j,i,j,a,b); myif2(i+1,j+1,i,j,a,b);
          }
        }
        if(j==w-1){
          myif1(i,j,a,b);
          else{
            myif2(i-1,j-1,i,j,a,b); myif2(i-1,j,i,j,a,b); myif2(i,j-1,i,j,a,b);
            myif2(i+1,j-1,i,j,a,b); myif2(i+1,j,i,j,a,b);
          }
        }
        else{
          myif1(i,j,a,b);
          else{
            myif2(i-1,j-1,i,j,a,b); myif2(i-1,j,i,j,a,b); myif2(i-1,j+1,i,j,a,b);
            myif2(i,j-1,i,j,a,b); myif2(i,j+1,i,j,a,b); myif2(i+1,j-1,i,j,a,b);
            myif2(i+1,j,i,j,a,b); myif2(i+1,j+1,i,j,a,b);
          }
        }
      }
    }
    
    for(int i=0 ; i<h ; i++){
      for(int j=0 ; j<w ; j++){
        cout<<b[i][j];
      }
      cout<<endl;
    }
  }

Compiler output:
a.cc: In function 'std::string myif1(int, int, std::string, std::string)':
a.cc:4:10: error: invalid types '__gnu_cxx::__alloc_traits<std::allocator<char>, char>::value_type {aka char}[int]' for array subscript
    4 |   if(x[a][b]=="#") y[a][b]=="#";
      |          ^
a.cc:4:24: error: invalid types '__gnu_cxx::__alloc_traits<std::allocator<char>, char>::value_type {aka char}[int]' for array subscript
    4 |   if(x[a][b]=="#") y[a][b]=="#";
      |                        ^
a.cc:5:1: warning: no return statement in function returning non-void [-Wreturn-type]
    5 | }
      | ^
a.cc: In function 'std::string myif2(int, int, int, int, std::string, std::string)':
a.cc:8:10: error: invalid types '__gnu_cxx::__alloc_traits<std::allocator<char>, char>::value_type {aka char}[int]' for array subscript
    8 |   if(x[a][b]=="#") y[c][d]++;
      |          ^
a.cc:8:24: error: invalid types '__gnu_cxx::__alloc_traits<std::allocator<char>, char>::value_type {aka char}[int]' for array subscript
    8 |   if(x[a][b]=="#") y[c][d]++;
      |                        ^
a.cc:9:1: warning: no return statement in function returning non-void [-Wreturn-type]
    9 | }
      | ^
a.cc: In function 'int main()':
a.cc:17:6: error: no match for 'operator>>' (operand types are 'std::istream' {aka 'std::basic_istream<char>'} and 'std::vector<std::__cxx11::basic_string<char> >')
   17 |   cin>>s;
      |   ~~~^~~
      |   |    |
      |   |    std::vector<std::__cxx11::basic_string<char> >
      |   std::istream {aka std::basic_istream<char>}
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>]'
  170 |       operator>>(bool& __n)
      |       ^~~~~~~~
/usr/include/c++/14/istream:170:24: note:   no known conversion for argument 1 from 'std::vector<std::__cxx11::basic_string<char> >' to 'bool&'
  170 |       operator>>(bool& __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>]'
  174 |       operator>>(short& __n);
      |       ^~~~~~~~
/usr/include/c++/14/istream:174:25: note:   no known conversion for argument 1 from 'std::vector<std::__cxx11::basic_string<char> >' to 'short int&'
  174 |       operator>>(short& __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>]'
  177 |       operator>>(unsigned short& __n)
      |       ^~~~~~~~
/usr/include/c++/14/istream:177:34: note:   no known conversion for argument 1 from 'std::vector<std::__cxx11::basic_string<char> >' to 'short unsigned int&'
  177 |       operator>>(unsigned short& __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>]'
  181 |       operator>>(int& __n);
      |       ^~~~~~~~
/usr/include/c++/14/istream:181:23: note:   no known conversion for argument 1 from 'std::vector<std::__cxx11::basic_string<char> >' to 'int&'
  181 |       operator>>(int& __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>]'
  184 |       operator>>(unsigned int& __n)
      |       ^~~~~~~~
/usr/include/c++/14/istream:184:32: note:   no known conversion for argument 1 from 'std::vector<std::__cxx11::basic_string<char> >' to 'unsigned int&'
  184 |       operator>>(unsigned int& __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>]'
  188 |       operator>>(long& __n)
      |       ^~~~~~~~
/usr/include/c++/14/istream:188:24: note:   no known conversion for argument 1 from 'std::vector<std::__cxx11::basic_string<char> >' to 'long int&'
  188 |       operator>>(long& __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>]'
  192 |       operator>>(unsigned long& __n)
      |       ^~~~~~~~
/usr/include/c++/14/istream:192:33: note:   no known conversion for argument 1 from 'std::vector<std::__cxx11::basic_string<char> >' to 'long unsigned int&'
  192 |       operator>>(unsigned long& __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>]'
  199 |       operator>>(long long& __n)
      |       ^~~~~~~~
/usr/include/c++/14/istream:199:29: note:   no known conversion for argument 1 from 'std::vector<std::__cxx11::basic_string<char> >' to 'long long int&'
  199 |       operator>>(long long& __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>]'
  203 |       operator>>(unsigned long long& __n)
      |       ^~~~~~~~
/usr/include/c++/14/istream:203:38: note:   no known conversion for argument 1 from 'std::vector<std::__cxx11::basic_string<char> >' to 'long long unsigned int&'
  203 |       operator>>(unsigned long long& __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>]'
  219 |       operator>>(float& __f)
      |       ^~~~~~~~
/usr/include/c++/14/istream:219:25: note:   no known conversion for argument 1 from 'std::vector<std::__cxx11::basic_string<char> >' to 'float&'
  219 |       operator>>(float& __f)
      |                  ~~~~~~~^~~
/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>]'
  223 |       operator>>(double& __f)
      |       ^~~~~~~~
/usr/include/c++/14/istream:223:26: note:   no known conversion for argument 1 from 'std::vector<std::__cxx11::basic_string<char> >' to 'double&'
  223 |       operator>>(double& __f)
      |                  ~~~~~~~~^~~
/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>]'
  227 |       operator>>(long double& __f)
      |       ^~~~~~~~
/usr/include/c++/14/istream:227:31: note:   no known conversion for argument 1 from 'std::vector<std::__cxx11::basic_string<char> >' to 'long double&'
  227 |       operator>>(long double& __f)
      |                  ~~~~~~~~~~~~~^~~
/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>]'
  328 |       operator>>(void*& __p)
      |       ^~~~~~~~
/usr/include/c++/14/istream:328:25: note:   no known conversion for argument 1 from 'std::vector<std::__cxx11::basic_string<char> >' to 'void*&'
  328 |       operator>>(void*& __p)
      |                  ~~~~~~~^~~
/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>]'
  122 |       operator>>(__istream_type& (*__pf)(__istream_type&))
      |       ^~~~~~~~
/usr/include/c++/14/istream:122:36: note:   no known conversion for argument 1 from 'std::vector<std::__cxx11::basic_string<char> >' to 'std::basic_istream<char>::__istream_type& (*)(std::basic_istream<char>::__istream_type&)' {aka 'std::basic_istream<char>& (*)(std::basic_istream<char>&)'}
  122 |       operator>>(__istream_type& (*__pf)(__istream_type&))
      |                  ~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/istream:126:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(__ios_type& (*)(__ios_type&)) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>; __ios_type = std::basic_ios<char>]'
  126 |       operator>>(__ios_type& (*__pf)(__ios_type&))
      |       ^~~~~~~~
/usr/include/c++/14/istream:126:32: note:   no known convers