Language: C++

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

int main() {
  int i, j;
  
  int h, w;
  cin >> h >> w;
  
  vector<string> s(h);
  for (i = 0; i < h; i++) {
    cin >> s[i];
  }
  
  int is, ie, js, je;
  for (i = 0; i < h; i++) {
    if (0 < i && i < h - 1) {
      is = -1; ie = 1;
    } else if (i == 0) {
      is = 0; ie = 1;
    } else {
      is = -1, ie = 0;
    }
    for (j = 0; j < w; j++) {
      if (0 < j && j < w - 1) {
        js = -1; je = 1;
      } else if (j == 0) {
        js = 0; je = 1;
      } else {
        js = -1; je = 0;
      }
      
      if (s[i][j] == '.') {
        int count;
        for (int ii = i + is; ii <= i + ie; ii++) {
          for (int jj = j + js; jj <= j + je; jj++) {
            if (s[ii][jj] == '#') {
              count++;
            }
          }
        }
        s[i].replace(j, 1, count);
      }
    }
  }
  
  for (i = 0; i < h; i++) {
    cout << s[i] << endl;
  }
}

Compiler output:
a.cc: In function 'int main()':
a.cc:42:21: error: no matching function for call to 'std::__cxx11::basic_string<char>::replace(int&, int, int&)'
   42 |         s[i].replace(j, 1, count);
      |         ~~~~~~~~~~~~^~~~~~~~~~~~~
In file included from /usr/include/c++/14/string:54,
                 from /usr/include/c++/14/bitset:52,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:52,
                 from a.cc:1:
/usr/include/c++/14/bits/basic_string.h:2275:7: note: candidate: 'std::__cxx11::basic_string<_CharT, _Traits, _Alloc>& std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::replace(size_type, size_type, const _CharT*) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; size_type = long unsigned int]' (near match)
 2275 |       replace(size_type __pos, size_type __n1, const _CharT* __s)
      |       ^~~~~~~
/usr/include/c++/14/bits/basic_string.h:2275:7: note:   conversion of argument 3 would be ill-formed:
a.cc:42:28: error: invalid conversion from 'int' to 'const char*' [-fpermissive]
   42 |         s[i].replace(j, 1, count);
      |                            ^~~~~
      |                            |
      |                            int
/usr/include/c++/14/bits/basic_string.h:2413:9: note: candidate: 'template<class _InputIterator, class> std::__cxx11::basic_string<_CharT, _Traits, _Alloc>& std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::replace(const_iterator, const_iterator, _InputIterator, _InputIterator) [with <template-parameter-2-2> = _InputIterator; _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]'
 2413 |         replace(const_iterator __i1, const_iterator __i2,
      |         ^~~~~~~
/usr/include/c++/14/bits/basic_string.h:2413:9: note:   candidate expects 4 arguments, 3 provided
/usr/include/c++/14/bits/basic_string.h:2522:9: note: candidate: 'template<class _Tp> std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::_If_sv<_Tp, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&> std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::replace(size_type, size_type, const _Tp&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]'
 2522 |         replace(size_type __pos, size_type __n, const _Tp& __svt)
      |         ^~~~~~~
/usr/include/c++/14/bits/basic_string.h:2522:9: note:   template argument deduction/substitution failed:
In file included from /usr/include/c++/14/bits/stl_pair.h:60,
                 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/type_traits: In substitution of 'template<bool _Cond, class _Tp> using std::enable_if_t = typename std::enable_if::type [with bool _Cond = false; _Tp = std::__cxx11::basic_string<char>&]':
/usr/include/c++/14/bits/basic_string.h:149:8:   required by substitution of 'template<class _CharT, class _Traits, class _Alloc> template<class _Tp, class _Res> using std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::_If_sv = std::enable_if_t<((bool)std::__and_<std::is_convertible<const _Tp&, std::basic_string_view<_CharT, _Traits> >, std::__not_<std::is_convertible<const _Tp*, const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>*> >, std::__not_<std::is_convertible<const _Tp&, const _CharT*> > >::value), _Res> [with _Tp = int; _Res = std::__cxx11::basic_string<char>&; _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]'
  149 |         using _If_sv = enable_if_t<
      |               ^~~~~~
/usr/include/c++/14/bits/basic_string.h:2522:2:   required by substitution of 'template<class _Tp> std::__cxx11::basic_string<char>::_If_sv<_Tp, std::__cxx11::basic_string<char>&> std::__cxx11::basic_string<char>::replace(size_type, size_type, const _Tp&) [with _Tp = int]'
 2522 |         replace(size_type __pos, size_type __n, const _Tp& __svt)
      |         ^~~~~~~
a.cc:42:21:   required from here
   42 |         s[i].replace(j, 1, count);
      |         ~~~~~~~~~~~~^~~~~~~~~~~~~
/usr/include/c++/14/type_traits:2711:11: error: no type named 'type' in 'struct std::enable_if<false, std::__cxx11::basic_string<char>&>'
 2711 |     using enable_if_t = typename enable_if<_Cond, _Tp>::type;
      |           ^~~~~~~~~~~
/usr/include/c++/14/bits/basic_string.h:2540:9: note: candidate: 'template<class _Tp> std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::_If_sv<_Tp, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&> std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::replace(size_type, size_type, const _Tp&, size_type, size_type) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]'
 2540 |         replace(size_type __pos1, size_type __n1, const _Tp& __svt,
      |         ^~~~~~~
/usr/include/c++/14/bits/basic_string.h:2540:9: note:   candidate expects 4 arguments, 3 provided
/usr/include/c++/14/bits/basic_string.h:2562:9: note: candidate: 'template<class _Tp> std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::_If_sv<_Tp, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&> std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::replace(const_iterator, const_iterator, const _Tp&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]'
 2562 |         replace(const_iterator __i1, const_iterator __i2, const _Tp& __svt)
      |         ^~~~~~~
/usr/include/c++/14/bits/basic_string.h:2562:9: note:   template argument deduction/substitution failed:
a.cc:42:22: note:   cannot convert 'j' (type 'int') to type 'std::__cxx11::basic_string<char>::const_iterator'
   42 |         s[i].replace(j, 1, count);
      |                      ^
/usr/include/c++/14/bits/basic_string.h:2200:7: note: candidate: 'std::__cxx11::basic_string<_CharT, _Traits, _Alloc>& std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::replace(size_type, size_type, const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; size_type = long unsigned int]'
 2200 |       replace(size_type __pos, size_type __n, const basic_string& __str)
      |       ^~~~~~~
/usr/include/c++/14/bits/basic_string.h:2200:67: note:   no known conversion for argument 3 from 'int' to 'const std::__cxx11::basic_string<char>&'
 2200 |       replace(size_type __pos, size_type __n, const basic_string& __str)
      |                                               ~~~~~~~~~~~~~~~~~~~~^~~~~
/usr/include/c++/14/bits/basic_string.h:2223:7: note: candidate: 'std::__cxx11::basic_string<_CharT, _Traits, _Alloc>& std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::replace(size_type, size_type, const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, size_type, size_type) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; size_type = long unsigned int]'
 2223 |       replace(size_type __pos1, size_type __n1, const basic_string& __str,
      |       ^~~~~~~
/usr/include/c++/14/bits/basic_string.h:2223:7: note:   candidate expects 5 arguments, 3 provided
/usr/include/c++/14/bits/basic_string.h:2249:7: note: candidate: 'std::__cxx11::basic_string<_CharT, _Traits, _Alloc>& std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::replace(size_type, size_type, const _CharT*, size_type) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; size_type = long unsigned int]'
 2249 |       replace(size_type __pos, size_type __n1, const _CharT* __s,
      |       ^~~~~~~
/usr/include/c++/14/bits/basic_string.h:2249:7: note:   candidate expects 4 arguments, 3 provided
/usr/include/c++/14/bits/basic_string.h:2300:7: note: candidate: 'std::__cxx11::basic_string<_CharT, _Traits, _Alloc>& std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::replace(size_type, size_type, size_type, _CharT) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; size_type = long unsigned int]'
 2300 |       replace(size_type __pos, size_type __n1, size_type __n2, _CharT __c)
      |       ^~~~~~~
/usr/include/c++/14/bits/basic_string.h:2300:7: note:   candidate expects 4 arguments, 3 provided
/usr/include/c++/14/bits/basic_string.h:2319:7: note: candidate: 'std::__cxx11::basic_string<_CharT, _Traits, _Alloc>& std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::replace(__const_iterator, __const_iterator, const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; __const_iterator = std::__cxx11::basic_string<char>::const_iterator]'
 2319 |       replace(__const_iterator __i1, __const_iterator __i2,
      |       ^~~~~~~
/usr/include/c++/14/bits/basic_string.h:2319:32: note:   no known conversion for argument 1 from 'int' to 'std::__cxx11::basic_string<char>::__const_iterator' {aka 'std::__cxx11::basic_string<char>::const_iterator'}
 2319 |       replace(__const_iterator __i1, __const_iterator __i2,
      |               ~~~~~~~~~~~~~~~~~^~~~
/usr/include/c++/14/bits/basic_string.h:2340:7: note: candidate: 'std::__cxx11::basic_string<_CharT, _Traits, _Alloc>& std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::replace(__const_iterator, __const_iterator, const _CharT*, size_type) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; __const_iterator = std::__cxx11::basic_string<char>::const_iterator; size_type = long unsigned int]'
 2340 |       replace(__const_iterator __i1, __const_iterator __i2,
      |       ^~~~~~~
/usr/include/c++/14/bits/basic_string.h:2340:7: note:   candidate expects 4 arguments, 3 provided
/usr/include/c++/14/bits/basic_string.h:2363:7: note: candidate: 'std::__cxx11::basic_string<_CharT, _Traits, _Alloc>& std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::replace(__const_iterator, __const_iterator, const _CharT*) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; __const_iterator = std::__cxx11::basic_string<char>::const_iterator]'
 2363 |       replace(__const_iterator __i1, __const_iterator __i2, const _CharT* __s)
      |       ^~~~~~~
/usr/include/c++/14/bits/basic_string.h: