Language: C++

#include<bits/stdc++.h>
int main(){
  int a;
  cin>>a;
  vector<int> c(a)=0,b(a),d(a);
  for(int i=0;i<a;i++)cin>>b[i]>>c[i];
  for(int i=0;i<a;i++){
    for(int j=0;j<a;j++){
      if((b[i]>c[j])&&(b[i]>c[j]))c[i]++;
      if((b[i]<c[j])&&(b[i]<c[j]))c[i]++;
    }
  }
  for(int i=0;i<a;i++)cout<<c[i]<<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:4:3: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    4 |   cin>>a;
      |   ^~~
      |   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:5:3: error: 'vector' was not declared in this scope
    5 |   vector<int> c(a)=0,b(a),d(a);
      |   ^~~~~~
a.cc:5:3: 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:5:10: error: expected primary-expression before 'int'
    5 |   vector<int> c(a)=0,b(a),d(a);
      |          ^~~
a.cc:6:28: error: 'b' was not declared in this scope
    6 |   for(int i=0;i<a;i++)cin>>b[i]>>c[i];
      |                            ^
a.cc:6:34: error: 'c' was not declared in this scope
    6 |   for(int i=0;i<a;i++)cin>>b[i]>>c[i];
      |                                  ^
a.cc:9:11: error: 'b' was not declared in this scope
    9 |       if((b[i]>c[j])&&(b[i]>c[j]))c[i]++;
      |           ^
a.cc:9:16: error: 'c' was not declared in this scope
    9 |       if((b[i]>c[j])&&(b[i]>c[j]))c[i]++;
      |                ^
a.cc:10:11: error: 'b' was not declared in this scope
   10 |       if((b[i]<c[j])&&(b[i]<c[j]))c[i]++;
      |           ^
a.cc:10:16: error: 'c' was not declared in this scope
   10 |       if((b[i]<c[j])&&(b[i]<c[j]))c[i]++;
      |                ^
a.cc:13:23: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
   13 |   for(int i=0;i<a;i++)cout<<c[i]<<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:13:29: error: 'c' was not declared in this scope
   13 |   for(int i=0;i<a;i++)cout<<c[i]<<endl;
      |                             ^
a.cc:13:35: error: 'endl' was not declared in this scope; did you mean 'std::endl'?
   13 |   for(int i=0;i<a;i++)cout<<c[i]<<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)
      |     ^~~~