[Level 1, C++] 나누어 떨어지는 숫자 배열

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

vector<int> solution(vector<int> arr, int divisor) {
    vector<int> answer;
    for(int & i : arr) {
        if(i % divisor == 0) answer.push_back(i);
    }
    sort(answer.begin(), answer.end());
    if(answer.size() == 0) answer.push_back(-1);
    return answer;
}