Language: C++

#include <bits/stdc++.h>
using namespace std;
int main(){
    int X,Y,A,B,C;
    cin >> X >> Y >> A >> B >> C;
    long vector<int> red(A);
    for (int i = 0; i < A; i++) {
        cin >> red.at(i);
        }
    long vector<int> bulue(B);
    for (int i = 0; i < B; i++) {
        cin >> bulue.at(i);
        }
    long vector<int> less(C);
    for (int i = 0; i < C; i++) {
        cin >> less.at(i);
        }
    

    sort(red.begin(),red.end());
    sort(bulue.begin(),bulue.end());
    sort(less.begin(),less.end());

    long vector<int> ans = long vector<int>(X+Y, 0);

    for (int i = 0; i < X; i++) {
        ans.at(i)=red.at(red.size()-i-1);
    }
    for(int i = 0; i < Y; i++) {
        ans.at(i+X)=bulue.at(bulue.size()-i-1);
    }

    sort(ans.begin(),ans.end());

    for (int i = 0; i < less.size(); i++) {
        if(ans.at(i)<less.at(less.size()-i-1)){
            ans.at(i)=less.at(less.size()-i-1);
        }
    }

    
    long int sum = 0;
    for (int i = 0; i < X+Y; i++) {
        sum += ans.at(i);
        }

    cout << sum << endl;

}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:22: error: invalid declarator before 'red'
    6 |     long vector<int> red(A);
      |                      ^~~
a.cc:8:16: error: 'red' was not declared in this scope; did you mean 'read'?
    8 |         cin >> red.at(i);
      |                ^~~
      |                read
a.cc:10:22: error: invalid declarator before 'bulue'
   10 |     long vector<int> bulue(B);
      |                      ^~~~~
a.cc:12:16: error: 'bulue' was not declared in this scope
   12 |         cin >> bulue.at(i);
      |                ^~~~~
a.cc:14:22: error: invalid declarator before 'less'
   14 |     long vector<int> less(C);
      |                      ^~~~
a.cc:16:20: error: missing template arguments before '.' token
   16 |         cin >> less.at(i);
      |                    ^
a.cc:20:10: error: 'red' was not declared in this scope; did you mean 'read'?
   20 |     sort(red.begin(),red.end());
      |          ^~~
      |          read
a.cc:21:10: error: 'bulue' was not declared in this scope
   21 |     sort(bulue.begin(),bulue.end());
      |          ^~~~~
a.cc:22:14: error: missing template arguments before '.' token
   22 |     sort(less.begin(),less.end());
      |              ^
a.cc:22:27: error: missing template arguments before '.' token
   22 |     sort(less.begin(),less.end());
      |                           ^
a.cc:24:22: error: invalid declarator before 'ans'
   24 |     long vector<int> ans = long vector<int>(X+Y, 0);
      |                      ^~~
a.cc:27:9: error: 'ans' was not declared in this scope; did you mean 'abs'?
   27 |         ans.at(i)=red.at(red.size()-i-1);
      |         ^~~
      |         abs
a.cc:30:9: error: 'ans' was not declared in this scope; did you mean 'abs'?
   30 |         ans.at(i+X)=bulue.at(bulue.size()-i-1);
      |         ^~~
      |         abs
a.cc:33:10: error: 'ans' was not declared in this scope; did you mean 'abs'?
   33 |     sort(ans.begin(),ans.end());
      |          ^~~
      |          abs
a.cc:35:29: error: missing template arguments before '.' token
   35 |     for (int i = 0; i < less.size(); i++) {
      |                             ^
a.cc:36:26: error: missing template arguments before '.' token
   36 |         if(ans.at(i)<less.at(less.size()-i-1)){
      |                          ^
a.cc:36:34: error: missing template arguments before '.' token
   36 |         if(ans.at(i)<less.at(less.size()-i-1)){
      |                                  ^
a.cc:37:27: error: missing template arguments before '.' token
   37 |             ans.at(i)=less.at(less.size()-i-1);
      |                           ^
a.cc:37:35: error: missing template arguments before '.' token
   37 |             ans.at(i)=less.at(less.size()-i-1);
      |                                   ^