[프로그래머스 / Java] Lv.1 푸드 파이트 대회

Question

https://school.programmers.co.kr/learn/courses/30/lessons/134240

프로그래머스

---

Code

💡방법 1

class Solution {
    public String solution(int[] food) {
        String answer = "0";

        for (int i = food.length - 1; i > 0; i--) {
            for (int j = 0; j < food[i] / 2; j++) {
                answer = i + answer + i; 
            }
        }

        return answer;
    }
}

• String + int는 결과가 String타입이다. ^[각주:1]

💡방법 2

class Solution {
    public String solution(int[] food) {
        StringBuilder sb = new StringBuilder();
        
        for(int i = 1; i < food.length; i++) {
            int count = food[i] / 2;
            sb.append(String.valueOf(i).repeat(count));
        }
        
        String answer = sb + "0";
        answer += sb.reverse();
        
        return answer;
    }
}

• String.repeat(int count) ^[각주:2]
  • 현재 문자열을 count번 반복한 새 문자열 반환

1. https://docs.oracle.com/javase/specs/jls/se17/html/jls-15.html#jls-15.18.1 [본문으로]
2. https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/lang/String.html#repeat(int) [본문으로]