Lv.1 3진법 뒤집기

https://programmers.co.kr/learn/courses/30/lessons/68935

코딩테스트 연습 - 3진법 뒤집기

import java.util.*;
class Solution {
    public int solution(int n) {
        
        int q = n;
        int r = 0;
        String str = "";
        
        while(true){
            r = q % 3;
            q = q / 3;
            str += String.valueOf(r);
            if(q == 0) break;
        }
        
        String[] arrStr = str.split("");
        int s = str.length();
        int[] arr = new int[s];
        for(int i = 0; i < s; i++){
            arr[i] = Integer.parseInt(arrStr[i]);
        }
        
        int answer = 0;
        for(int i = 0; i < s; i++){
            answer += arr[i] * Math.pow(3, s-i-1);
        }
        
        return answer;
    }
}

성공