[프로그래머스 1] 나누어 떨어지는 숫자 배열 (C/C++)

#include <string>
#include <vector>
#include <algorithm>
using namespace std;
 
vector<int> solution(vector<int> arr, int divisor) 
{
    vector<int> answer;
    
    int flag = 0;
    for(int i = 0; i < arr.size(); i++)
    {
        if(arr[i] % divisor == 0)
        {
            flag = 1;
            answer.push_back(arr[i]);
        }
    }
    
    sort(answer.begin(), answer.end());
    
    if(flag == 0)
    {
        answer.push_back(-1);
    }
    
    return answer;
}