using namespace std;
vector<int> solution(vector<int> answers) {
    vector<int> answer;
    
    vector<int> a = {1,2,3,4,5};
    vector<int> b = {2,1,2,3,2,4,2,5};
    vector<int> c = {3,3,1,1,2,2,4,4,5,5};
    
    int idx = 0;
    int score_a =0, score_b=0, score_c=0;
    for(int ans : answers){
        if (ans == a[idx%a.size()])
            score_a +=1;
        if (ans == b[idx%b.size()])
            score_b +=1;
        if (ans == c[idx%c.size()])
            score_c +=1;
        idx+=1;
    }
    
    //사실상 `vector<pair<int,int>>`도 쓸 필요 없음
    vector<pair<int, int>> scores;
    scores.push_back(make_pair(1, score_a));
    scores.push_back(make_pair(2, score_b));
    scores.push_back(make_pair(3, score_c));
    
    int max =0;
    for(int i = 0 ; i < scores.size() ; ++i){
        if (max < scores[i].second)
            max = scores[i].second;
    }
    
    for(int i = 0 ; i < scores.size() ; ++i){
        if (max == scores[i].second)
            answer.push_back(i+1);
    } 
    return answer;
}