Language: C++

#include<iostream>
#include<vector>
int main()
{
   int r, c, i, j, sum, edge;
   cin >> r >> c;
   vector<int> sq[r + 2][c + 2];
   for ( i = 0; i < r; i++)
   {
      for( j = 0; j < c; j++)
      {
         cin >> sq[i][j];
      }
   }
   for( i = 0; i < r; i++)
   {   
      for( j = 0; j < c; j++)
      {
         sum = sum + sq[i][j];
         sq[i][c + 1] = sum;
          ege = edge + sum;
      }
      sum = 0;
   }
   for( i = 0; i < c; i++)
   {
      for( j = 0; j < r; r++)
      {
         sum = sum + sq[j][i];
         sq[r + 1][i] = sum;
         edge = edge + sum;
      }
      sum = 0;
   }
   sq[r + 1][c + 1] = edge;
   for( i = 0; i < r + 1; i++)
   {
      for( j = 0; j < c + 1; j++)
      {
         cout << sq[i][j];
      }
      cout << endl;
   }
return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:4: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    6 |    cin >> r >> c;
      |    ^~~
      |    std::cin
In file included 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:7:4: error: 'vector' was not declared in this scope
    7 |    vector<int> sq[r + 2][c + 2];
      |    ^~~~~~
a.cc:7:4: note: suggested alternatives:
In file included from /usr/include/c++/14/vector:66,
                 from a.cc:2:
/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:7:11: error: expected primary-expression before 'int'
    7 |    vector<int> sq[r + 2][c + 2];
      |           ^~~
a.cc:12:17: error: 'sq' was not declared in this scope
   12 |          cin >> sq[i][j];
      |                 ^~
a.cc:19:22: error: 'sq' was not declared in this scope
   19 |          sum = sum + sq[i][j];
      |                      ^~
a.cc:21:11: error: 'ege' was not declared in this scope; did you mean 'edge'?
   21 |           ege = edge + sum;
      |           ^~~
      |           edge
a.cc:29:22: error: 'sq' was not declared in this scope
   29 |          sum = sum + sq[j][i];
      |                      ^~
a.cc:35:4: error: 'sq' was not declared in this scope
   35 |    sq[r + 1][c + 1] = edge;
      |    ^~
a.cc:40:10: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
   40 |          cout << sq[i][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:42:7: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
   42 |       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:42:15: error: 'endl' was not declared in this scope; did you mean 'std::endl'?
   42 |       cout << endl;
      |               ^~~~
      |               std::endl
In file included from /usr/include/c++/14/iostream:41:
/usr/include/c++/14/ostream:744:5: note: 'std::endl' declared here
  744 |     endl(basic_ostream<_CharT, _Traits>& __os)
      |     ^~~~