class Solution {
public String solution(String cipher, int code) {
StringBuilder sb = new StringBuilder();
// 반복 횟수
int repeat = cipher.length() / code;
// 인덱스
int idx = code - 1;
for (int i = 0; i < repeat; i++) {
sb.append(cipher.charAt(idx));
idx += code;
}
return sb.toString();
}
}
Java
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