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4889 안정적인 문자열
입력값 하나씩 stack 에 넣으면서 만약 '{' '}' 이렇게 한 쌍이 된다면 바로 pop 시켜버림
6236 용돈 관리
2진 탐색으로 찾음.
1245 농장관리
bfs + 재귀를 이용했는데 상하좌우 + 대각선 1칸까지 고려하여 8칸을 비교하는데 만약 높이가 같은 산이 주위에 있다면 재귀를 통해서 유효한지 확인.
그래서 본인 주위의 8칸이 본인보다 낮다면 1씩 더하여 값을 구함
20167 꿈틀꿈틀 호석 애벌레 - 기능성
이거 그리디로 접근하다가 실패함.. (찾아보니 그리디가 아니라 DP로 풀 수 있다고 하더라..)
그래서 모든 경우를 다 계산해서 품.. ㅎㅎ