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🔎 문제 소개
🖊️ 풀이
번호를 받아 리스트로 변환하여 각 자리의 값들을 요소로 분리해내었다.
요소들끼리 서로 비교하여 같은 값이 나오는 순간, 반복문을 멈추고 중복되는 번호로 판정하게 하였다.
(번호들의 개수)에서 (중복되는 번호의 개수)를 빼주는 것으로 답을 구현하였다.
10^n의 꼴로 번호를 나눠보거나 하는 식으로 각 자리 수를 빼낼까 했지만, 역시 리스트로 분류하는게 가장 간단하다고 생각했다.