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🧷 문제 링크
https://www.acmicpc.net/problem/1354
🧭 풀이 시간
20분
👀 체감 난이도
✏️ 문제 설명
무한 수열 A는 다음과 같다.
Ai = 1 (i ≤ 0)
Ai = A⌊i/P⌋-X + A⌊i/Q⌋-Y (i ≥ 1)
N, P, Q, X, Y가 주어질 때, AN을 구하는 프로그램을 작성하시오.
0 ≤ N ≤ 10^13
2 ≤ P, Q ≤ 10^9
0 ≤ X, Y ≤ 10^9
🔍 풀이 방법
그저 재귀로 풀었는데, 시간초과 날 것을 고려하여 메모이제이션 기법을 사용하였다.
⏳ 회고