[レベル1]反転三進法(JAVA)

import java.util.*;

class Solution {
    
    public int solution(int n) {
        StringBuilder sb = new StringBuilder();
        int answer = 0;
        while(n > 0){
            sb.append(n % 3);
            n = n / 3;
        }
        
        answer = Integer.parseInt(sb.toString(), 3);
        
        return answer;
        
    }
}