[20251213] BOJ / G5 / 4와 7 / 설진영 #1667
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🧷 문제 링크
https://www.acmicpc.net/problem/2877
🧭 풀이 시간
25분
👀 체감 난이도
✏️ 문제 설명
4와 7로만 이루어진 수 중에서 K번째로 작은 수를 구하는 문제
🔍 풀이 방법
4와 7로 이루어진 수는 이진수와 1:1 매핑
⏳ 회고
ez