[20250803] BOJ / G5 / 4와 7 / 김수연 #600
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🧷 문제 링크
https://www.acmicpc.net/problem/2877
🧭 풀이 시간
30분
👀 체감 난이도
✏️ 문제 설명
4와 7로 이루어진 수 중에서 K번째 작은 수 구하기
🔍 풀이 방법
K+1해서 이진수를 구하고,
맨 끝자리 수 빼고 이를 4와 7로 교환해주었다.
⏳ 회고
비트마스킹을 사용해서도 풀어봐야겠다.