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🔎 문제 소개
🖊️ 풀이
풀이 과정, 느낀 점, 하고 싶은 말, 풀이 팁 등을 자유롭게 기재합니다.
누적 합이라는 개념에 대해서 처음 알게 되었습니다.
N 부터 M 까지 누적 합을 구할 때
1 ~ M 까지의 누적 합에서 1 ~ (N - 1) 까지의 누적 합을 빼주면 구할 수 있습니다.