프로그래머스 qr code (JAVA)

https://school.programmers.co.kr/learn/courses/30/lessons/181903

프로그래머스

 

 

class Solution {
    public String solution(int q, int r, String code) {
        String answer = "";
        StringBuilder sb = new StringBuilder();
        for(int i = 0 ; i < code.length() ; i++){
            if(i % q == r){
                sb.append(code.charAt(i));
            }
        }
        answer = sb.toString();
        return answer;
    }
}