[프로그래머스 2] n진수 게임 (C/C++)

#include <string>
#include <vector>
#include <iostream>
using namespace std;
 
string change(int num, int n)
{
    string temp;
    
    if(num == 0)
    {
        return "0";
    }
    
    while(num > 0)
    {
        if(num % n < 10)
        {
            temp = to_string(num % n) + temp;   
        }
        else
        {
            if(num % n == 10)
            {
                temp = "A" + temp;
            }
            else if(num % n == 11)
            {
                temp = "B" + temp;
            }
            else if(num % n == 12)
            {
                temp = "C" + temp;
            }
            else if(num % n == 13)
            {
                temp = "D" + temp;
            }
            else if(num % n == 14)
            {
                temp = "E" + temp;
            }
            else if(num % n == 15)
            {
                temp = "F" + temp;
            }
        }
        
        num /= n;
    }
    
    return temp;
}
 
string solution(int n, int t, int m, int p) 
{
    string answer = "";
    
    string num;
    int cnt = 0;
    
    while(num.size() < t*m)
    {
        num = num + change(cnt, n);
        cnt++;
    }
    
    for(int i = p-1; i < num.size(); i += m)
    {
        answer += num[i];
        
        if(answer.size() == t)
        {
            return answer;
        }
    }
}