Лишние отрезки

#include <fstream>
#include <vector>
#include <algorithm>
using namespace std;

int a[1000000];
int b[1000000];
vector <int> answer;
int main(){
    int n;
    ifstream fin("input.txt");
    fin >> n;
    for (int i=0;i<n;i++){
        fin >> a[i];
    }
    for (int i=0;i<n;i++){
        fin >> b[i];
    }
    for (int i=0;i<n;i++){
        for (int j=i+1;j<n;j++){
            if (a[i]==a[j]) continue;
            if (b[i]<=a[j]) break;
            if (b[i]>=b[j]) answer.push_back(j);
        }
    }
    sort( answer.begin(), answer.end() );
    answer.erase( unique( answer.begin(), answer.end() ), answer.end() );
    ofstream fout("output.txt");
    fout << answer.size() << endl;
    for (int i=0;i<answer.size();i++){
        fout << answer[i]+1 << ' ';
    }
    fout.close();
    return 0;
}