[알고리즘문제풀기] qr code

문제

내가 작성한 정답

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

다른 사람들의 정답

class Solution {
    public String solution(int q, int r, String code) {

        StringBuilder sb = new StringBuilder();

        for (int i = r; i < code.length(); i += q)
            sb.append(code.charAt(i));

        return sb.toString();
    }
}

import java.util.stream.*;

class Solution {
    public String solution(int q, int r, String code) {
        return IntStream.range(0, code.length()).filter(operand -> operand % q == r).mapToObj(i -> String.valueOf(code.charAt(i))).collect(Collectors.joining());
    }
}