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🧷 문제 링크
https://www.acmicpc.net/problem/2877
🧭 풀이 시간
30분
👀 체감 난이도
✏️ 문제 설명
창용이는 4와 7로만 이루어진 수를 좋아한다.
좋아하는 수 중에 k번째 작은 값을 구하라.
🔍 풀이 방법
4와 7로만 이루어진 수들을 길이별로 사전순 정렬하면, 같은 길이에서는 앞 절반이 4로 시작하고 뒤 절반이 7로 시작한다.
k번째 수가 어떤 길이인지 먼저 판별한 다음 앞/뒤 절반 중 어디에 속하는지를 반복적으로 판별하며 자릿수를 하나씩 결정.
⏳ 회고