[20250922] BOJ / G4 / 문제 추천 시스템 Version 1 / 이강현 #952
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🧷 문제 링크
https://www.acmicpc.net/problem/21939
🧭 풀이 시간
20분
👀 체감 난이도
✏️ 문제 설명
명령에 맞게 문제 번호와 난이도가 주어진 문제를 처리하기
🔍 풀이 방법
treeset, map
⏳ 회고
ez