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🌱 문제번호와 링크
https://www.acmicpc.net/problem/1149
🥺 무엇을 알게 되었나요?
마지막이 r일때, g일때, b일때를 모두 구해서
그중 가장 최솟값을 구한다.
d[i][_]는 i번째 집까지 칠했을 때 최소비용이니까
d[i][0] 마지막집이 r일때 i까지 칠했을때 최소비용임