Language: C++

#include<bits/stdc++.h>
using namesapce std;
int main(){
  int N; cin>>N;
  vector<int> A(N);
  int S=0;
  for(int i=0; i<N; i++){
    cin>>A.at(i);
 
  }
  int Q;cin>>Q;
  vector<vector<int>> B(Q,vector<int>(2));
  for(int i=0; i<Q; i++){
    for(int j=0; j<2; j++){
      cin>>B.at(i).at(j);
    }
  }
  for(int i=0; i<Q; i++){
    for(int j=0; i<N; i++){
      if(A.at(j)==B.at(i).at(0)){
        A.at(j)=B.at(i).at(1);
      }
      S+=A.at(i);
    }
    cout<<S<<endl;
    S=0;
  }
}

    
  

Compiler output:
a.cc:2:7: error: expected nested-name-specifier before 'namesapce'
    2 | using namesapce std;
      |       ^~~~~~~~~
a.cc: In function 'int main()':
a.cc:4:10: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    4 |   int N; cin>>N;
      |          ^~~
      |          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> A(N);
      |   ^~~~~~
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> A(N);
      |          ^~~
a.cc:8:10: error: 'A' was not declared in this scope
    8 |     cin>>A.at(i);
      |          ^
a.cc:12:17: error: expected primary-expression before 'int'
   12 |   vector<vector<int>> B(Q,vector<int>(2));
      |                 ^~~
a.cc:15:12: error: 'B' was not declared in this scope
   15 |       cin>>B.at(i).at(j);
      |            ^
a.cc:20:10: error: 'A' was not declared in this scope
   20 |       if(A.at(j)==B.at(i).at(0)){
      |          ^
a.cc:20:19: error: 'B' was not declared in this scope
   20 |       if(A.at(j)==B.at(i).at(0)){
      |                   ^
a.cc:23:10: error: 'A' was not declared in this scope
   23 |       S+=A.at(i);
      |          ^
a.cc:25:5: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
   25 |     cout<<S<<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:25:14: error: 'endl' was not declared in this scope; did you mean 'std::endl'?
   25 |     cout<<S<<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)
      |     ^~~~