Language: C++

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

int main(){
  int H,W;
  cin >> H >> W;
  
  vector<vector<char>> table(H,vecotr<char>(W));
  for(int i=0;i<H;i++){
    for(int j=0;j<W;j++){
      cin >> table.at(i).at(j);
    }
  }
  
  vector<bool> flagH(H,false);
  vector<bool> flagW(W,false);
  for(int i=0;i<H;i++){
    for(int j=0;j<W;j++){
      if(table.at(i).at(j)=='#'){
        flagH.at(i)=true;
        flagW.at(j)=true;
      }
    }
  }
  
    for(int i=0;i<H;i++){
  	  for(int j=0;j<W;j++){
        if(flagH.at(i)&&flagW.at(j))
          cout << table.at(i).at(j);
        if(j=W-1)
          cout << endl;
      }
    }
   
}

Compiler output:
a.cc:2:17: error: 'etd' is not a namespace-name
    2 | using namespace etd;
      |                 ^~~
a.cc: In function 'int main()':
a.cc:6:3: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    6 |   cin >> H >> W;
      |   ^~~
      |   std::cin
In file included from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:146,
                 from a.cc:1:
/usr/include/c++/14/iostream:62:18: note: 'std::cin' declared here
   62 |   extern istream cin;           ///< Linked to standard input
      |                  ^~~
a.cc:8:3: error: 'vector' was not declared in this scope
    8 |   vector<vector<char>> table(H,vecotr<char>(W));
      |   ^~~~~~
a.cc:8:3: note: suggested alternatives:
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:
/usr/include/c++/14/bits/stl_vector.h:428:11: note:   'std::vector'
  428 |     class vector : protected _Vector_base<_Tp, _Alloc>
      |           ^~~~~~
/usr/include/c++/14/vector:93:13: note:   'std::pmr::vector'
   93 |       using vector = std::vector<_Tp, polymorphic_allocator<_Tp>>;
      |             ^~~~~~
a.cc:8:17: error: expected primary-expression before 'char'
    8 |   vector<vector<char>> table(H,vecotr<char>(W));
      |                 ^~~~
a.cc:11:14: error: 'table' was not declared in this scope
   11 |       cin >> table.at(i).at(j);
      |              ^~~~~
a.cc:15:10: error: expected primary-expression before 'bool'
   15 |   vector<bool> flagH(H,false);
      |          ^~~~
a.cc:16:10: error: expected primary-expression before 'bool'
   16 |   vector<bool> flagW(W,false);
      |          ^~~~
a.cc:19:10: error: 'table' was not declared in this scope
   19 |       if(table.at(i).at(j)=='#'){
      |          ^~~~~
a.cc:20:9: error: 'flagH' was not declared in this scope
   20 |         flagH.at(i)=true;
      |         ^~~~~
a.cc:21:9: error: 'flagW' was not declared in this scope
   21 |         flagW.at(j)=true;
      |         ^~~~~
a.cc:28:12: error: 'flagH' was not declared in this scope
   28 |         if(flagH.at(i)&&flagW.at(j))
      |            ^~~~~
a.cc:28:25: error: 'flagW' was not declared in this scope
   28 |         if(flagH.at(i)&&flagW.at(j))
      |                         ^~~~~
a.cc:29:11: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
   29 |           cout << table.at(i).at(j);
      |           ^~~~
      |           std::cout
/usr/include/c++/14/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
a.cc:29:19: error: 'table' was not declared in this scope
   29 |           cout << table.at(i).at(j);
      |                   ^~~~~
a.cc:31:11: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
   31 |           cout << endl;
      |           ^~~~
      |           std::cout
/usr/include/c++/14/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
a.cc:31:19: error: 'endl' was not declared in this scope; did you mean 'std::endl'?
   31 |           cout << endl;
      |                   ^~~~
      |                   std::endl
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:
/usr/include/c++/14/ostream:744:5: note: 'std::endl' declared here
  744 |     endl(basic_ostream<_CharT, _Traits>& __os)
      |     ^~~~