[BOJ 3474] 교수가 된 현우 - #32
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풀이 요약
N에 대해N!에 포함된 5의 개수를 계산한다.2 * 5쌍으로 만들어지고, 팩토리얼에서는 2보다 5가 적으므로 5의 개수만 세면 된다.N을 나눈 몫을 누적해 5, 25, 125 등에서 추가로 생기는 5의 개수를 반영한다.Link
https://velog.io/@sh0723/PS-%EB%B0%B1%EC%A4%80-3474-%EA%B5%90%EC%88%98%EA%B0%80-%EB%90%9C-%ED%98%84%EC%9A%B0
문제
Closes #31