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🧷 문제 링크
https://www.acmicpc.net/problem/2877
🧭 풀이 시간
40분
👀 체감 난이도
✏️ 문제 설명
4와 7로 이루어진 수 중에 K번째로 작은 수를 찾는 문제입니다.
🔍 풀이 방법
2가지의 수로 이루어진 수이기 때문에
각 자릿수 별로 2의 n승개의 숫자를 만들 수 있습니다.
이를 이용해서 순서를 구하고 그에 맞게 4와 7일 배합해서 숫자를 구했습니다.
⏳ 회고
숫자 2개로 이루어진 수 라는 점에서 이진법을 떠올리는 것에 시간이 소요되었는데 이런 인사이트도 있구나 싶었습니다.