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PR Summary
<풀이 시간>
약 40분
<문제 회고>
F가 십만 이하이니 친구관계가 생성될 때마다 일일이 탐색하는 건 시간초과가 날 거라 생각했다. 유니온파인드가 생각이나서 그대로 풀이했다.