[Python] 가장 가까운 같은 글자

https://school.programmers.co.kr/learn/courses/30/lessons/142086

프로그래머스

def solution(s):
    answer = []
    chr_dict = {}
    
    for idx, chr_ in enumerate(s):
    
        if chr_ not in chr_dict:
            answer.append(-1)
            chr_dict[chr_] = idx
            
        else:
            dist = idx - chr_dict[chr_]
            answer.append(dist)
            chr_dict[chr_] = idx
    return answer