프로그래머스 가장 가까운 같은 글자(JAVA)

https://school.programmers.co.kr/learn/courses/30/lessons/142086?language=java 

프로그래머스

 

 

import java.util.*;
class Solution {
    private static final int SIZE = 26;
    public int[] solution(String s) {
        int sSize = s.length();
        int[] answer = new int[sSize];
        int[] index = new int[SIZE];
        Arrays.fill(index, -1);
        for(int i = 0 ; i < sSize ; i++){
            char ch = s.charAt(i);
            int chIndex = ch - 'a';
            if(index[chIndex] == -1){
                answer[i] = -1;
            }else{
                answer[i] = i - index[chIndex];
            }
            index[chIndex] = i;
        }
        return answer;
    }
}