Language: C++

#include <bits/stdc++.h>
using namespace std;
#define rep(i,n) for (int i=0;i<(int)(n);i++)

int main(){
  int H, W;
  cin>> H >>W;
  int n=0;
  vector<string> vec(H);
  vector<string> vecans(H);
  rep(i,H){
    cin>>vec.at(i);
  }
  rep(i,H){
    rep(j,W){
      if(vec.at(i).at(j)=='#'){
        vecans.at(i).at(j)=vec.at(i).at(j);
      }
      else{
        if(i!=0 && i!=H-1 && j!=0 && j!= W-1){
          if(vec.at(i-1).at(j-1)=='.'){
            n++;
          }
          if(vec.at(i-1).at(j)=='.'){
            n++;
          }
          if(vec.at(i-1).at(j+1)=='.'){
            n++;
          }
          if(vec.at(i).at(j-1)=='.'){
            n++;
          }
          if(vec.at(i).at(j+1)=='.'){
            n++;
          }
          if(vec.at(i+1).at(j-1)=='.'){
            n++;
          }
          if(vec.at(i+1).at(j)=='.'){
            n++;
          }
          if(vec.at(i+1).at(j+1)=='.'){
            n++;
          }
        }
        if(i==0 && j!=0 && j!= W-1){
          if(vec.at(i).at(j-1)=='.'){
            n++;
          }
          if(vec.at(i).at(j+1)=='.'){
            n++;
          }
          if(vec.at(i+1).at(j-1)=='.'){
            n++;
          }
          if(vec.at(i+1).at(j)=='.'){
            n++;
          }
          if(vec.at(i+1).at(j+1)=='.'){
            n++;
          }
        }
        if(i==H-1 && j!=0 && j!=W-1){
          if(vec.at(i-1).at(j-1)=='.'){
            n++;
          }
          if(vec.at(i-1).at(j)=='.'){
            n++;
          }
          if(vec.at(i-1).at(j+1)=='.'){
            n++;
          }
          if(vec.at(i).at(j-1)=='.'){
            n++;
          }
          if(vec.at(i).at(j+1)=='.'){
            n++;
          }
        }
        if(i!=0 && i!=H-1 && j==0){
          
          if(vec.at(i-1).at(j)=='.'){
            n++;
          }
          if(vec.at(i-1).at(j+1)=='.'){
            n++;
          }
          
          if(vec.at(i).at(j+1)=='.'){
            n++;
          }
          
          if(vec.at(i+1).at(j)=='.'){
            n++;
          }
          if(vec.at(i+1).at(j+1)=='.'){
            n++;
          }
        }
        if(i!=0 && i!=H-1  && j== W-1){
          if(vec.at(i-1).at(j-1)=='.'){
            n++;
          }
          if(vec.at(i-1).at(j)=='.'){
            n++;
          }
         
          if(vec.at(i).at(j-1)=='.'){
            n++;
          }
          
          if(vec.at(i+1).at(j-1)=='.'){
            n++;
          }
          if(vec.at(i+1).at(j)=='.'){
            n++;
          }
        }
        if(i==0 &&j==0){
         
          
          if(vec.at(i).at(j+1)=='.'){
            n++;
          }
          
          if(vec.at(i+1).at(j)=='.'){
            n++;
          }
          if(vec.at(i+1).at(j+1)=='.'){
            n++;
          }
        }
        if(i==0 && j== W-1){
         
          if(vec.at(i).at(j-1)=='.'){
            n++;
          }
         
          if(vec.at(i+1).at(j-1)=='.'){
            n++;
          }
          if(vec.at(i+1).at(j)=='.'){
            n++;
          }
        }
        if(i==H-1 && j==0){
          
          if(vec.at(i-1).at(j)=='.'){
            n++;
          }
          if(vec.at(i-1).at(j+1)=='.'){
            n++;
          }
          
          if(vec.at(i).at(j+1)=='.'){
            n++;
          } 
        }
        if(i==H-1&& j== W-1){
          if(vec.at(i-1).at(j-1)=='.'){
            n++;
          }
          if(vec.at(i-1).at(j)=='.'){
            n++;
          }
          
          if(vec.at(i).at(j-1)=='.'){
            n++;
          }
        }
        vecans.at(i).at(j)=n;
      }
      n=0;
    }
  }
  
  cout<<vecans<<endl;
      
}

Compiler output:
a.cc: In function 'int main()':
a.cc:177:7: error: no match for 'operator<<' (operand types are 'std::ostream' {aka 'std::basic_ostream<char>'} and 'std::vector<std::__cxx11::basic_string<char> >')
  177 |   cout<<vecans<<endl;
      |   ~~~~^~~~~~~~
      |   |     |
      |   |     std::vector<std::__cxx11::basic_string<char> >
      |   std::ostream {aka std::basic_ostream<char>}
In file included from /usr/include/c++/14/istream:41,
                 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/ostream:116:7: note: candidate: 'std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(__ostream_type& (*)(__ostream_type&)) [with _CharT = char; _Traits = std::char_traits<char>; __ostream_type = std::basic_ostream<char>]'
  116 |       operator<<(__ostream_type& (*__pf)(__ostream_type&))
      |       ^~~~~~~~
/usr/include/c++/14/ostream:116:36: note:   no known conversion for argument 1 from 'std::vector<std::__cxx11::basic_string<char> >' to 'std::basic_ostream<char>::__ostream_type& (*)(std::basic_ostream<char>::__ostream_type&)' {aka 'std::basic_ostream<char>& (*)(std::basic_ostream<char>&)'}
  116 |       operator<<(__ostream_type& (*__pf)(__ostream_type&))
      |                  ~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/ostream:125:7: note: candidate: 'std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(__ios_type& (*)(__ios_type&)) [with _CharT = char; _Traits = std::char_traits<char>; __ostream_type = std::basic_ostream<char>; __ios_type = std::basic_ios<char>]'
  125 |       operator<<(__ios_type& (*__pf)(__ios_type&))
      |       ^~~~~~~~
/usr/include/c++/14/ostream:125:32: note:   no known conversion for argument 1 from 'std::vector<std::__cxx11::basic_string<char> >' to 'std::basic_ostream<char>::__ios_type& (*)(std::basic_ostream<char>::__ios_type&)' {aka 'std::basic_ios<char>& (*)(std::basic_ios<char>&)'}
  125 |       operator<<(__ios_type& (*__pf)(__ios_type&))
      |                  ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~
/usr/include/c++/14/ostream:135:7: note: candidate: 'std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(std::ios_base& (*)(std::ios_base&)) [with _CharT = char; _Traits = std::char_traits<char>; __ostream_type = std::basic_ostream<char>]'
  135 |       operator<<(ios_base& (*__pf) (ios_base&))
      |       ^~~~~~~~
/usr/include/c++/14/ostream:135:30: note:   no known conversion for argument 1 from 'std::vector<std::__cxx11::basic_string<char> >' to 'std::ios_base& (*)(std::ios_base&)'
  135 |       operator<<(ios_base& (*__pf) (ios_base&))
      |                  ~~~~~~~~~~~~^~~~~~~~~~~~~~~~~
/usr/include/c++/14/ostream:174:7: note: candidate: 'std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(long int) [with _CharT = char; _Traits = std::char_traits<char>; __ostream_type = std::basic_ostream<char>]'
  174 |       operator<<(long __n)
      |       ^~~~~~~~
/usr/include/c++/14/ostream:174:23: note:   no known conversion for argument 1 from 'std::vector<std::__cxx11::basic_string<char> >' to 'long int'
  174 |       operator<<(long __n)
      |                  ~~~~~^~~
/usr/include/c++/14/ostream:178:7: note: candidate: 'std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(long unsigned int) [with _CharT = char; _Traits = std::char_traits<char>; __ostream_type = std::basic_ostream<char>]'
  178 |       operator<<(unsigned long __n)
      |       ^~~~~~~~
/usr/include/c++/14/ostream:178:32: note:   no known conversion for argument 1 from 'std::vector<std::__cxx11::basic_string<char> >' to 'long unsigned int'
  178 |       operator<<(unsigned long __n)
      |                  ~~~~~~~~~~~~~~^~~
/usr/include/c++/14/ostream:182:7: note: candidate: 'std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(bool) [with _CharT = char; _Traits = std::char_traits<char>; __ostream_type = std::basic_ostream<char>]'
  182 |       operator<<(bool __n)
      |       ^~~~~~~~
/usr/include/c++/14/ostream:182:23: note:   no known conversion for argument 1 from 'std::vector<std::__cxx11::basic_string<char> >' to 'bool'
  182 |       operator<<(bool __n)
      |                  ~~~~~^~~
In file included from /usr/include/c++/14/ostream:1022:
/usr/include/c++/14/bits/ostream.tcc:96:5: note: candidate: 'std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(short int) [with _CharT = char; _Traits = std::char_traits<char>]'
   96 |     basic_ostream<_CharT, _Traits>::
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/ostream.tcc:97:22: note:   no known conversion for argument 1 from 'std::vector<std::__cxx11::basic_string<char> >' to 'short int'
   97 |     operator<<(short __n)
      |                ~~~~~~^~~
/usr/include/c++/14/ostream:189:7: note: candidate: 'std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(short unsigned int) [with _CharT = char; _Traits = std::char_traits<char>; __ostream_type = std::basic_ostream<char>]'
  189 |       operator<<(unsigned short __n)
      |       ^~~~~~~~
/usr/include/c++/14/ostream:189:33: note:   no known conversion for argument 1 from 'std::vector<std::__cxx11::basic_string<char> >' to 'short unsigned int'
  189 |       operator<<(unsigned short __n)
      |                  ~~~~~~~~~~~~~~~^~~
/usr/include/c++/14/bits/ostream.tcc:110:5: note: candidate: 'std::basic_ostream<_CharT, _Traits>& std::basic_ostream<_CharT, _Traits>::operator<<(int) [with _CharT = char; _Traits = std::char_traits<char>]'
  110 |     basic_ostream<_CharT, _Traits>::
      |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/ostream.tcc:111:20: note:   no known conversion for argument 1 from 'std::vector<std::__cxx11::basic_string<char> >' to 'int'
  111 |     operator<<(int __n)
      |                ~~~~^~~
/usr/include/c++/14/ostream:200:7: note: candidate: 'std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(unsigned int) [with _CharT = char; _Traits = std::char_traits<char>; __ostream_type = std::basic_ostream<char>]'
  200 |       operator<<(unsigned int __n)
      |       ^~~~~~~~
/usr/include/c++/14/ostream:200:31: note:   no known conversion for argument 1 from 'std::vector<std::__cxx11::basic_string<char> >' to 'unsigned int'
  200 |       operator<<(unsigned int __n)
      |                  ~~~~~~~~~~~~~^~~
/usr/include/c++/14/ostream:211:7: note: candidate: 'std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(long long int) [with _CharT = char; _Traits = std::char_traits<char>; __ostream_type = std::basic_ostream<char>]'
  211 |       operator<<(long long __n)
      |       ^~~~~~~~
/usr/include/c++/14/ostream:211:28: note:   no known conversion for argument 1 from 'std::vector<std::__cxx11::basic_string<char> >' to 'long long int'
  211 |       operator<<(long long __n)
      |                  ~~~~~~~~~~^~~
/usr/include/c++/14/ostream:215:7: note: candidate: 'std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(long long unsigned int) [with _CharT = char; _Traits = std::char_traits<char>; __ostream_type = std::basic_ostream<char>]'
  215 |       operator<<(unsigned long long __n)
      |       ^~~~~~~~
/usr/include/c++/14/ostream:215:37: note:   no known conversion for argument 1 from 'std::vector<std::__cxx11::basic_string<char> >' to 'long long unsigned int'
  215 |       operator<<(unsigned long long __n)
      |                  ~~~~~~~~~~~~~~~~~~~^~~
/usr/include/c++/14/ostream:231:7: note: candidate: 'std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(double) [with _CharT = char; _Traits = std::char_traits<char>; __ostream_type = std::basic_ostream<char>]'
  231 |       operator<<(double __f)
      |       ^~~~~~~~
/usr/include/c++/14/ostream:231:25: note:   no known conversion for argument 1 from 'std::vector<std::__cxx11::basic_string<char> >' to 'double'
  231 |       operator<<(double __f)
      |                  ~~~~~~~^~~
/usr/include/c++/14/ostream:235:7: note: candidate: 'std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(float) [with _CharT = char; _Traits = std::char_traits<char>; __ostream_type = std::basic_ostream<char>]'
  235 |       operator<<(float __f)
      |       ^~~~~~~~
/usr/include/c++/14/ostream:235:24: note:   no known conversion for argument 1 from 'std::vector<std::__cxx11::basic_string<char> >' to 'float'
  235 |       operator<<(float __f)
      |                  ~~~~~~^~~
/usr/include/c++/14/ostream:243:7: note: candidate: 'std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(long double) [with _CharT = char; _Traits = std::char_traits<char>; __ostream_type = std::basic_ostream<char>]'
  243 |       operator<<(long double __f)
      |       ^~~~~~~~
/usr/include/c++/14/ostream:243:30: note:   no known conversion for argument 1 from 'std::vector<std::__cxx11::basic_string<char> >' to 'long double'
  243 |       operator<<(long double __f)
      |                  ~~~~~~~~~~~~^~~
/usr/include/c++/14/ostream:301:7: note: candidate: 'std::basic_ostream<_CharT, _Traits>::__ostream_type& std::basic_ostream<_CharT, _Traits>::operator<<(const void*) [with _CharT = char; _Traits = std::char_traits<char>; __ostream_type = std::basic_ostream<char>]'
  301 |       operator<<(const void* __p)
      |       ^~~~~~~~
/usr/include/c++/14/ostream:301:30: note:   no known conversion for argument 1 from 'std::vector<std::__cxx11::basic_string<char> >' to 'const void*'
  301 |       operator<<(const void* __p)
      |                  ~~~~~~~~~~~~^~~
/usr/include/c+