Language: C++

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

# define NMAX 1000000001

// void change(int b, int c, std::vector<int> &seq){
//     for(int i=0; i < b; i++){
//         if(seq.at(i) < c){
//             seq.at(i) = c;
//         }else{
//             return;
//         }
//     }
// }
//
// void map_change(){
//
// }

int main(){
    int N, M;
    cin >> N >> M;
    std::vector<int> seq(N);
    for(int i=0; i < N; i++){
        cin >> seq.at(i);
    }
    vector<std::vector<int> > ope(M, vector<int>(2));
    std::map<int, int> ope_map;
    // for(int i=0; i < M; i++){
    //     cin >> ope.at(i).at(0) >> ope.at(i).at(1);
    // }
    int a, b;
    for(int i=0; i < M; i++){
        cin >> a >> b;
        if(ope_map.count(b)){
            ope_map[b] += a;
        }else{
            ope_map[b] = a;
        }

    }
    sort(seq.begin(), seq.end());
    std::vector<int> ope_seq(N, 0);
    int pointer = 0;
    for (map<int, int>::iterator iter = ope_map.end(), iter --; iter != ope_map.begin(); --iter){
        int len = pointer + iter->second;
        for(int i=pointer; i < len; i++){
            ope_seq.at(i) = iter->first;
            pointer ++;
            if(pointer >= N){
                break;
            }
        }
        if(pointer >= N){
            break;
        }
    }
    sort(ope_seq.begin(), ope_seq.end());
    // for(int i=0; i < N; i++){
    //     cout << seq.at(i) << " ";
    // }
    // cout << endl;
    // for(int i=0; i < N; i++){
    //     cout << ope_seq.at(i) << " ";
    // }
    // cout << endl;
    std::vector<int>::iterator iter_ope = ope_seq.end() - 1;
    std::vector<int>::iterator iter_seq = seq.end() - 1;
    long sum = 0;
    for(int i=0; i < N; i++){

        if(*iter_ope > *iter_seq){
            sum += *iter_ope;

            iter_ope --;
        }else{
            sum += *iter_seq;

            iter_seq --;
        }
    }


    // for(int i=0; i < M; i++){
    //     change(ope.at(i).at(0), ope.at(i).at(1), seq);
    // }
    // long sum = accumulate(seq.begin(), seq.end(), 0);
    cout << sum << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:45:60: error: expected ';' before '--' token
   45 |     for (map<int, int>::iterator iter = ope_map.end(), iter --; iter != ope_map.begin(); --iter){
      |                                                            ^~~
      |                                                            ;
a.cc:45:63: error: expected primary-expression before ';' token
   45 |     for (map<int, int>::iterator iter = ope_map.end(), iter --; iter != ope_map.begin(); --iter){
      |                                                               ^
a.cc:45:88: error: expected ')' before ';' token
   45 |     for (map<int, int>::iterator iter = ope_map.end(), iter --; iter != ope_map.begin(); --iter){
      |         ~                                                                              ^
      |                                                                                        )
a.cc:45:92: error: 'iter' was not declared in this scope; did you mean 'pointer'?
   45 |     for (map<int, int>::iterator iter = ope_map.end(), iter --; iter != ope_map.begin(); --iter){
      |                                                                                            ^~~~
      |                                                                                            pointer