Language: C++

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

int main() {
  int H, W;
  vector<vector<char>> v(H,vector<char>(W," ") );
  
  for(int i=0; i<H; i++){
    for(int j=0; j<W; j++){
      cin >> v[i][j];
    }
  }
  
  for(int i=0; i<H; i++){
    for(int j=0; j<W; j++){
      if(v[i][j] == "."){
        int t=0;
        if(j!=0 && v[i][j-1]=="#")
          t++;
        if(j!=0 && i!=0 && v[i-1][j-1]=="#")
          t++;
        if(j!=0 && (i+1)!=H && v[i+1][j-1]=="#")
          t++;
        if(i!=0 && v[i-1][j]=="#")  t++;
        if((i+1)!=H && v[i+1][j]=="#")  t++;
        if((j+1)!=W){
          if(i!=0 &&v[i-1][j+1]=="#")  t++;
          if(v[i][j+1]=="#")  t++;
          if((i+1)!=H &&v[i+1][j+1]=="#")  t++;
        }
      }
      v[i][j] = to_string(t);
    }
  }
  for(int i=0; i<H; i++){
    for(int j=0; j<W; j++){
      cout << v[i][j];
    }
    endl;
  }
}


Compiler output:
a.cc: In function 'int main()':
a.cc:6:46: error: no matching function for call to 'std::vector<char>::vector(int&, const char [2])'
    6 |   vector<vector<char>> v(H,vector<char>(W," ") );
      |                                              ^
In file included from /usr/include/c++/14/vector:66,
                 from /usr/include/c++/14/functional:64,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:53,
                 from a.cc:1:
/usr/include/c++/14/bits/stl_vector.h:569:7: note: candidate: 'std::vector<_Tp, _Alloc>::vector(size_type, const value_type&, const allocator_type&) [with _Tp = char; _Alloc = std::allocator<char>; size_type = long unsigned int; value_type = char; allocator_type = std::allocator<char>]' (near match)
  569 |       vector(size_type __n, const value_type& __value,
      |       ^~~~~~
/usr/include/c++/14/bits/stl_vector.h:569:7: note:   conversion of argument 2 would be ill-formed:
a.cc:6:43: error: invalid conversion from 'const char*' to 'std::vector<char>::value_type' {aka 'char'} [-fpermissive]
    6 |   vector<vector<char>> v(H,vector<char>(W," ") );
      |                                           ^~~
      |                                           |
      |                                           const char*
/usr/include/c++/14/bits/stl_vector.h:707:9: note: candidate: 'template<class _InputIterator, class> std::vector<_Tp, _Alloc>::vector(_InputIterator, _InputIterator, const allocator_type&) [with <template-parameter-2-2> = _InputIterator; _Tp = char; _Alloc = std::allocator<char>]'
  707 |         vector(_InputIterator __first, _InputIterator __last,
      |         ^~~~~~
/usr/include/c++/14/bits/stl_vector.h:707:9: note:   template argument deduction/substitution failed:
a.cc:6:46: note:   deduced conflicting types for parameter '_InputIterator' ('int' and 'const char*')
    6 |   vector<vector<char>> v(H,vector<char>(W," ") );
      |                                              ^
/usr/include/c++/14/bits/stl_vector.h:678:7: note: candidate: 'std::vector<_Tp, _Alloc>::vector(std::initializer_list<_Tp>, const allocator_type&) [with _Tp = char; _Alloc = std::allocator<char>; allocator_type = std::allocator<char>]'
  678 |       vector(initializer_list<value_type> __l,
      |       ^~~~~~
/usr/include/c++/14/bits/stl_vector.h:678:43: note:   no known conversion for argument 1 from 'int' to 'std::initializer_list<char>'
  678 |       vector(initializer_list<value_type> __l,
      |              ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~
/usr/include/c++/14/bits/stl_vector.h:659:7: note: candidate: 'std::vector<_Tp, _Alloc>::vector(std::vector<_Tp, _Alloc>&&, std::__type_identity_t<_Alloc>&) [with _Tp = char; _Alloc = std::allocator<char>; std::__type_identity_t<_Alloc> = std::allocator<char>]'
  659 |       vector(vector&& __rv, const __type_identity_t<allocator_type>& __m)
      |       ^~~~~~
/usr/include/c++/14/bits/stl_vector.h:659:23: note:   no known conversion for argument 1 from 'int' to 'std::vector<char>&&'
  659 |       vector(vector&& __rv, const __type_identity_t<allocator_type>& __m)
      |              ~~~~~~~~~^~~~
/usr/include/c++/14/bits/stl_vector.h:640:7: note: candidate: 'std::vector<_Tp, _Alloc>::vector(std::vector<_Tp, _Alloc>&&, const allocator_type&, std::false_type) [with _Tp = char; _Alloc = std::allocator<char>; allocator_type = std::allocator<char>; std::false_type = std::false_type]'
  640 |       vector(vector&& __rv, const allocator_type& __m, false_type)
      |       ^~~~~~
/usr/include/c++/14/bits/stl_vector.h:640:7: note:   candidate expects 3 arguments, 2 provided
/usr/include/c++/14/bits/stl_vector.h:635:7: note: candidate: 'std::vector<_Tp, _Alloc>::vector(std::vector<_Tp, _Alloc>&&, const allocator_type&, std::true_type) [with _Tp = char; _Alloc = std::allocator<char>; allocator_type = std::allocator<char>; std::true_type = std::true_type]'
  635 |       vector(vector&& __rv, const allocator_type& __m, true_type) noexcept
      |       ^~~~~~
/usr/include/c++/14/bits/stl_vector.h:635:7: note:   candidate expects 3 arguments, 2 provided
/usr/include/c++/14/bits/stl_vector.h:624:7: note: candidate: 'std::vector<_Tp, _Alloc>::vector(const std::vector<_Tp, _Alloc>&, std::__type_identity_t<_Alloc>&) [with _Tp = char; _Alloc = std::allocator<char>; std::__type_identity_t<_Alloc> = std::allocator<char>]'
  624 |       vector(const vector& __x, const __type_identity_t<allocator_type>& __a)
      |       ^~~~~~
/usr/include/c++/14/bits/stl_vector.h:624:28: note:   no known conversion for argument 1 from 'int' to 'const std::vector<char>&'
  624 |       vector(const vector& __x, const __type_identity_t<allocator_type>& __a)
      |              ~~~~~~~~~~~~~~^~~
/usr/include/c++/14/bits/stl_vector.h:620:7: note: candidate: 'std::vector<_Tp, _Alloc>::vector(std::vector<_Tp, _Alloc>&&) [with _Tp = char; _Alloc = std::allocator<char>]'
  620 |       vector(vector&&) noexcept = default;
      |       ^~~~~~
/usr/include/c++/14/bits/stl_vector.h:620:7: note:   candidate expects 1 argument, 2 provided
/usr/include/c++/14/bits/stl_vector.h:601:7: note: candidate: 'std::vector<_Tp, _Alloc>::vector(const std::vector<_Tp, _Alloc>&) [with _Tp = char; _Alloc = std::allocator<char>]'
  601 |       vector(const vector& __x)
      |       ^~~~~~
/usr/include/c++/14/bits/stl_vector.h:601:7: note:   candidate expects 1 argument, 2 provided
/usr/include/c++/14/bits/stl_vector.h:556:7: note: candidate: 'std::vector<_Tp, _Alloc>::vector(size_type, const allocator_type&) [with _Tp = char; _Alloc = std::allocator<char>; size_type = long unsigned int; allocator_type = std::allocator<char>]'
  556 |       vector(size_type __n, const allocator_type& __a = allocator_type())
      |       ^~~~~~
/usr/include/c++/14/bits/stl_vector.h:556:51: note:   no known conversion for argument 2 from 'const char [2]' to 'const std::vector<char>::allocator_type&' {aka 'const std::allocator<char>&'}
  556 |       vector(size_type __n, const allocator_type& __a = allocator_type())
      |                             ~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/stl_vector.h:542:7: note: candidate: 'std::vector<_Tp, _Alloc>::vector(const allocator_type&) [with _Tp = char; _Alloc = std::allocator<char>; allocator_type = std::allocator<char>]'
  542 |       vector(const allocator_type& __a) _GLIBCXX_NOEXCEPT
      |       ^~~~~~
/usr/include/c++/14/bits/stl_vector.h:542:7: note:   candidate expects 1 argument, 2 provided
/usr/include/c++/14/bits/stl_vector.h:531:7: note: candidate: 'std::vector<_Tp, _Alloc>::vector() [with _Tp = char; _Alloc = std::allocator<char>]'
  531 |       vector() = default;
      |       ^~~~~~
/usr/include/c++/14/bits/stl_vector.h:531:7: note:   candidate expects 0 arguments, 2 provided
a.cc:16:18: error: ISO C++ forbids comparison between pointer and integer [-fpermissive]
   16 |       if(v[i][j] == "."){
a.cc:18:29: error: ISO C++ forbids comparison between pointer and integer [-fpermissive]
   18 |         if(j!=0 && v[i][j-1]=="#")
a.cc:20:39: error: ISO C++ forbids comparison between pointer and integer [-fpermissive]
   20 |         if(j!=0 && i!=0 && v[i-1][j-1]=="#")
a.cc:22:43: error: ISO C++ forbids comparison between pointer and integer [-fpermissive]
   22 |         if(j!=0 && (i+1)!=H && v[i+1][j-1]=="#")
a.cc:24:29: error: ISO C++ forbids comparison between pointer and integer [-fpermissive]
   24 |         if(i!=0 && v[i-1][j]=="#")  t++;
a.cc:25:33: error: ISO C++ forbids comparison between pointer and integer [-fpermissive]
   25 |         if((i+1)!=H && v[i+1][j]=="#")  t++;
a.cc:27:32: error: ISO C++ forbids comparison between pointer and integer [-fpermissive]
   27 |           if(i!=0 &&v[i-1][j+1]=="#")  t++;
a.cc:28:23: error: ISO C++ forbids comparison between pointer and integer [-fpermissive]
   28 |           if(v[i][j+1]=="#")  t++;
a.cc:29:36: error: ISO C++ forbids comparison between pointer and integer [-fpermissive]
   29 |           if((i+1)!=H &&v[i+1][j+1]=="#")  t++;
a.cc:32:27: error: 't' was not declared in this scope
   32 |       v[i][j] = to_string(t);
      |                           ^
a.cc:39:9: error: statement cannot resolve address of overloaded function
   39 |     endl;
      |         ^