Language: C++

using namespace std;

int main(){
  int X,Y,A,B,C;
  cin >> X >> Y >> A >> B >> C;
  vector<int64_t> p(A),q(B),r(C);
  for(int i=0;i<A;i++){
    cin >> p.at(i);
  }
  for(int i=0;i<B;i++){
    cin >> q.at(i);
  }
  for(int i=0;i<C;i++){
    cin >> r.at(i);
  }
  sort(p.begin(),p.end());
  reverse(p.begin(),p.end());
  sort(q.begin(),q.end());
  reverse(q.begin(),q.end());
  sort(r.begin(),r.end());
  reverse(r.begin(),r.end());
  int i=X-1,j=Y-1,k=0;
  while(min(p.at(i),q.at(j))<r.at(k)){
    if(p.at(i)>q.at(j)){
      q.at(j)=r.at(k);
      j--;
    }else{
      p.at(i)=r.at(k);
      i--;
    }
    k++;
    if(i<0) break;
    if(j<0) break;
    if(k>=C) break;
  }
  int64_t sum=0;
  for(int l=0;l<X;l++){
    sum += p.at(l);
  }
  for(int l=0;l<Y;l++){
    sum += q.at(l);
  }
  cout << sum << endl;
}
    

Compiler output:
a.cc: In function 'int main()':
a.cc:5:3: error: 'cin' was not declared in this scope
    5 |   cin >> X >> Y >> A >> B >> C;
      |   ^~~
a.cc:1:1: note: 'std::cin' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
  +++ |+#include <iostream>
    1 | using namespace std;
a.cc:6:3: error: 'vector' was not declared in this scope
    6 |   vector<int64_t> p(A),q(B),r(C);
      |   ^~~~~~
a.cc:1:1: note: 'std::vector' is defined in header '<vector>'; this is probably fixable by adding '#include <vector>'
  +++ |+#include <vector>
    1 | using namespace std;
a.cc:6:10: error: 'int64_t' was not declared in this scope
    6 |   vector<int64_t> p(A),q(B),r(C);
      |          ^~~~~~~
a.cc:1:1: note: 'int64_t' is defined in header '<cstdint>'; this is probably fixable by adding '#include <cstdint>'
  +++ |+#include <cstdint>
    1 | using namespace std;
a.cc:6:19: error: 'p' was not declared in this scope
    6 |   vector<int64_t> p(A),q(B),r(C);
      |                   ^
a.cc:6:24: error: 'q' was not declared in this scope
    6 |   vector<int64_t> p(A),q(B),r(C);
      |                        ^
a.cc:6:29: error: 'r' was not declared in this scope
    6 |   vector<int64_t> p(A),q(B),r(C);
      |                             ^
a.cc:16:3: error: 'sort' was not declared in this scope; did you mean 'short'?
   16 |   sort(p.begin(),p.end());
      |   ^~~~
      |   short
a.cc:17:3: error: 'reverse' was not declared in this scope
   17 |   reverse(p.begin(),p.end());
      |   ^~~~~~~
a.cc:23:9: error: 'min' was not declared in this scope; did you mean 'main'?
   23 |   while(min(p.at(i),q.at(j))<r.at(k)){
      |         ^~~
      |         main
a.cc:36:10: error: expected ';' before 'sum'
   36 |   int64_t sum=0;
      |          ^~~~
      |          ;
a.cc:38:5: error: 'sum' was not declared in this scope
   38 |     sum += p.at(l);
      |     ^~~
a.cc:41:5: error: 'sum' was not declared in this scope
   41 |     sum += q.at(l);
      |     ^~~
a.cc:43:3: error: 'cout' was not declared in this scope
   43 |   cout << sum << endl;
      |   ^~~~
a.cc:43:3: note: 'std::cout' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
a.cc:43:11: error: 'sum' was not declared in this scope
   43 |   cout << sum << endl;
      |           ^~~
a.cc:43:18: error: 'endl' was not declared in this scope
   43 |   cout << sum << endl;
      |                  ^~~~
a.cc:1:1: note: 'std::endl' is defined in header '<ostream>'; this is probably fixable by adding '#include <ostream>'
  +++ |+#include <ostream>
    1 | using namespace std;