"use strict"; const {Fragment: _Fragment, jsx: _jsx, jsxs: _jsxs} = arguments[0]; const {useMDXComponents: _provideComponents} = arguments[0]; function _createMdxContent(props) { const _components = { a: "a", code: "code", figure: "figure", h2: "h2", img: "img", li: "li", p: "p", pre: "pre", span: "span", ul: "ul", ..._provideComponents(), ...props.components }; return _jsxs(_Fragment, { children: [_jsx(_components.p, { children: _jsx(_components.a, { href: "https://www.acmicpc.net/problem/3109", children: "문제 링크" }) }), "\n", _jsx(_components.h2, { children: "문제" }), "\n", _jsx(_components.p, { children: "유명한 제빵사 김원웅은 빵집을 운영하고 있다. 원웅이의 빵집은 글로벌 재정 위기를 피해가지 못했고, 결국 심각한 재정 위기에 빠졌다." }), "\n", _jsx(_components.p, { children: "원웅이는 지출을 줄이고자 여기저기 지출을 살펴보던 중에, 가스비가 제일 크다는 것을 알게되었다. 따라서 원웅이는 근처 빵집의 가스관에 몰래 파이프를 설치해 훔쳐서 사용하기로 했다." }), "\n", _jsx(_components.p, { children: "빵집이 있는 곳은 R*C 격자로 표현할 수 있다. 첫째 열은 근처 빵집의 가스관이고, 마지막 열은 원웅이의 빵집이다." }), "\n", _jsx(_components.p, { children: "원웅이는 가스관과 빵집을 연결하는 파이프를 설치하려고 한다. 빵집과 가스관 사이에는 건물이 있을 수도 있다. 건물이 있는 경우에는 파이프를 놓을 수 없다." }), "\n", _jsx(_components.p, { children: "가스관과 빵집을 연결하는 모든 파이프라인은 첫째 열에서 시작해야 하고, 마지막 열에서 끝나야 한다. 각 칸은 오른쪽, 오른쪽 위 대각선, 오른쪽 아래 대각선으로 연결할 수 있고, 각 칸의 중심끼리 연결하는 것이다." }), "\n", _jsx(_components.p, { children: "원웅이는 가스를 되도록 많이 훔치려고 한다. 따라서, 가스관과 빵집을 연결하는 파이프라인을 여러 개 설치할 것이다. 이 경로는 겹칠 수 없고, 서로 접할 수도 없다. 즉, 각 칸을 지나는 파이프는 하나이어야 한다." }), "\n", _jsx(_components.p, { children: "원웅이 빵집의 모습이 주어졌을 때, 원웅이가 설치할 수 있는 가스관과 빵집을 연결하는 파이프라인의 최대 개수를 구하는 프로그램을 작성하시오." }), "\n", _jsx(_components.h2, { children: "입력" }), "\n", _jsx(_components.p, { children: "첫째 줄에 R과 C가 주어진다. (1 <= R <= 10,000, 5 <= C <= 500)" }), "\n", _jsx(_components.p, { children: "다음 R개 줄에는 빵집 근처의 모습이 주어진다. '.'는 빈 칸이고, 'x'는 건물이다. 처음과 마지막 열은 항상 비어있다." }), "\n", _jsx(_components.h2, { children: "출력" }), "\n", _jsx(_components.p, { children: "첫째 줄에 원웅이가 놓을 수 있는 파이프라인의 최대 개수를 출력한다." }), "\n", _jsx(_components.h2, { children: "풀이" }), "\n", _jsx(_components.p, { children: "이 문제는 각 행에서 출발해 DFS를 하되, 항상 오른쪽 위부터 우선적으로 탐색하는 그리디가 핵심이다. 더 위쪽으로 먼저 지나가야 아래쪽 경로들이 최대한 덜 막히기 때문이다." }), "\n", _jsxs(_components.p, { children: ["한 번 지나간 칸은 성공 여부와 관계없이 다시 방문하지 않도록 바로 ", _jsx(_components.code, { children: "'x'" }), "로 바꾼다. 이 처리가 중요하다. 어차피 어떤 칸에서 오른쪽 끝까지 갈 수 있는지 여부는 한 번 확인하면 충분하고, 다시 와도 더 좋은 경로가 생기지 않는다."] }), "\n", _jsx(_components.p, { children: "따라서 모든 행에 대해 첫 열에서 DFS를 시작하고, 하나의 DFS가 성공하면 파이프 하나를 확정한다. 유명한 빵집 문제의 정석 풀이 그대로다." }), "\n", _jsx(_components.h2, { children: "코드" }), "\n", _jsx(_components.figure, { "data-rehype-pretty-code-figure": "", children: _jsx(_components.pre, { style: { backgroundColor: "#2e3440ff", color: "#d8dee9ff" }, tabIndex: "0", "data-language": "java", "data-theme": "nord", 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_jsxs(_components.li, { children: ["공간 복잡도: ", _jsx(_components.code, { children: "O(RC)" })] }), "\n"] }), "\n", _jsx(_components.h2, { children: "마무리" }), "\n", _jsx(_components.p, { children: "빵집 문제는 DFS처럼 보이지만 사실상 탐색 순서가 정답을 좌우하는 그리디 문제다. 오른쪽 위부터 먼저 깔아 버리는 선택이 전체 파이프 수를 최대로 만든다." }), "\n", _jsx(_components.p, { children: _jsx(_components.img, { src: "/generated/posts/algorithm/boj-3109/assets/1.png", alt: "" }) })] }); } function MDXContent(props = {}) { const {wrapper: MDXLayout} = { ..._provideComponents(), ...props.components }; return MDXLayout ? _jsx(MDXLayout, { ...props, children: _jsx(_createMdxContent, { ...props }) }) : _createMdxContent(props); } return { default: MDXContent };

BOJ 3109 - 빵집