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PR Summary
<풀이 시간>
1시간 이상
<문제 회고>
오랜만에 트라이 문제를 푸니 기억이 잘 안났다. 예전에는 트라이노드 객체를 만들지 않고 딕셔너리를 사용했던 거 같은데 이번엔 노드 클래스를 만들어서 문제를 풀었다.