[알고리즘문제풀기] 코드 처리하기

문제

내가 작성한 정답

class Solution {
    public String solution(String code) {
        String answer = "";
        boolean mode = false; // false - 0, true -1
        for(int i=0; i<code.length(); i++){
            char c  = code.charAt(i);
            if(!mode){
                if(c=='1') mode = !mode;
                else {
                    if(i%2==0) answer += ""+c;
                }
            }else {
                if(c=='1') mode = !mode;
                else {
                    if(i%2==1) answer += ""+c;
                }
            }
        }
        return answer.length()==0?"EMPTY":answer;
    }
}

다른 사람들의 정답

class Solution {
    public String solution(String code) {
        StringBuilder answer = new StringBuilder();
        int mode = 0;
        for (int i = 0; i < code.length(); i++) {
            char current = code.charAt(i);
            if (current == '1') {
                mode = mode == 0 ? 1 : 0;
                continue;
            }

            if (i % 2 == mode) {
                answer.append(current);
            }
        }
        return answer.length() == 0 ? "EMPTY" : answer.toString();
    }
}