Language: C++

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

int main(){
  int N,M;
  cin >> N >> M;
  vector<int> vec(2M);
  
  for(int i=0; i<2M; i++){
    cin >> vec.at(i);
  }
  int number(N);
  
  for(int i=0; i<2M; i++){
    number.at(vec.at(i))++;
  }
  
  for(int i=0; i<N; i++){
    cout << number.at(i) << endl;
  }

Compiler output:
a.cc:2:7: error: expected nested-name-specifier before 'nameplace'
    2 | using nameplace std;
      |       ^~~~~~~~~
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 >> N >> M;
      |   ^~~
      |   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:7:3: error: 'vector' was not declared in this scope
    7 |   vector<int> vec(2M);
      |   ^~~~~~
a.cc:7:3: 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:7:10: error: expected primary-expression before 'int'
    7 |   vector<int> vec(2M);
      |          ^~~
a.cc:9:18: error: unable to find numeric literal operator 'operator""M'
    9 |   for(int i=0; i<2M; i++){
      |                  ^~
a.cc:10:12: error: 'vec' was not declared in this scope
   10 |     cin >> vec.at(i);
      |            ^~~
a.cc:14:18: error: unable to find numeric literal operator 'operator""M'
   14 |   for(int i=0; i<2M; i++){
      |                  ^~
a.cc:15:12: error: request for member 'at' in 'number', which is of non-class type 'int'
   15 |     number.at(vec.at(i))++;
      |            ^~
a.cc:15:15: error: 'vec' was not declared in this scope
   15 |     number.at(vec.at(i))++;
      |               ^~~
a.cc:19:5: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
   19 |     cout << number.at(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:19:20: error: request for member 'at' in 'number', which is of non-class type 'int'
   19 |     cout << number.at(i) << endl;
      |                    ^~
a.cc:19:29: error: 'endl' was not declared in this scope; did you mean 'std::endl'?
   19 |     cout << number.at(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)
      |     ^~~~
a.cc:20:4: error: expected '}' at end of input
   20 |   }
      |    ^
a.cc:4:11: note: to match this '{'
    4 | int main(){
      |           ^