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🧷 문제 링크
https://www.acmicpc.net/problem/15717
🧭 풀이 시간
30분
👀 체감 난이도
✏️ 문제 설명
N이 주어지면, 1이상 N미만의 수의 합으로 N을 나타내는 경우의 수를 구해보자.
🔍 풀이 방법
1, 2, 4, 8, ...이라서 답은 2^(N-1)이다.
⏳ 회고
N = 0일 때 예외 처리를 안 해줘서 틀렸다...