1. ๋ฌธ์ ์ค๋ช
๋ฌธ์๋ค์ด ๋ด๊ฒจ์๋ ๋ฐฐ์ด arr๊ฐ ์ฃผ์ด์ง๋๋ค. arr์ ์์๋ค์ ์์๋๋ก ์ด์ด ๋ถ์ธ ๋ฌธ์์ด์ return ํ๋ solutionํจ์๋ฅผ ์์ฑํด ์ฃผ์ธ์.

2. ํ์ด
class Solution {
public String solution(String[] arr) {
String answer = "";
for (int i = 0; i < arr.length; i++) {
answer += arr[i];
}
return answer;
}
}
3. ์ถ๋ ฅ ํ๋ฉด

์ถ์ฒ:https://school.programmers.co.kr/learn/courses/30/lessons/181941
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