[20250214] BOJ / 골드3 / 동전 / 이강현 #120
Merged
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🧷 문제 링크
https://www.acmicpc.net/problem/2091
🧭 풀이 시간
2일
👀 체감 난이도
✏️ 문제 설명
1,5,10,25원 동전이 있을 때 동전을 가장 많이 사용해서 K원을 만드시오.
🔍 풀이 방법
dp를 이용해서 dp[K]를 구하자. 동전을 이전 단계에서 한 개 추가하는 것으로 구현하고 하나 추가했을때 이전 조합을 붙여넣도록 구현.
⏳ 회고
핵심 부분은 적은 동전을 우선하여 dp값을 업데이트하되 적은 코인을 사용할 수 없을 때 큰 코인을 사용해서 업데이트하는 기준을 잘 삼아야 하는 것 같다.