"use strict"; const {Fragment: _Fragment, jsx: _jsx, jsxs: _jsxs} = arguments[0]; const {useMDXComponents: _provideComponents} = arguments[0]; function _createMdxContent(props) { const _components = { a: "a", annotation: "annotation", code: "code", figure: "figure", h2: "h2", img: "img", li: "li", math: "math", mi: "mi", mn: "mn", mo: "mo", mrow: "mrow", p: "p", pre: "pre", semantics: "semantics", span: "span", ul: "ul", ..._provideComponents(), ...props.components }; return _jsxs(_Fragment, { children: [_jsx(_components.p, { children: _jsx(_components.a, { href: "https://www.acmicpc.net/problem/16954", children: "문제 링크" }) }), "\n", _jsx(_components.h2, { children: "문제" }), "\n", _jsx(_components.p, { children: "욱제는 학교 숙제로 크기가 8x8인 체스판에서 탈출하는 게임을 만들었다. 체스판의 모든 칸은 빈 칸 또는 벽 중 하나이다. 욱제의 캐릭터는 가장 왼쪽 아랫 칸에 있고, 이 캐릭터는 가장 오른쪽 윗 칸으로 이동해야 한다." }), "\n", _jsx(_components.p, { children: "이 게임의 특징은 벽이 움직인다는 점이다. 1초마다 모든 벽이 아래에 있는 행으로 한 칸씩 내려가고, 가장 아래에 있어서 아래에 행이 없다면 벽이 사라지게 된다. 욱제의 캐릭터는 1초에 인접한 한 칸 또는 대각선 방향으로 인접한 한 칸으로 이동하거나, 현재 위치에 서 있을 수 있다. 이동할 때는 빈 칸으로만 이동할 수 있다." }), "\n", _jsx(_components.p, { children: "1초 동안 욱제의 캐릭터가 먼저 이동하고, 그 다음 벽이 이동한다. 벽이 캐릭터가 있는 칸으로 이동하면 더 이상 캐릭터는 이동할 수 없다." }), "\n", _jsx(_components.p, { children: "욱제의 캐릭터가 가장 오른쪽 윗 칸으로 이동할 수 있는지 없는지 구해보자." }), "\n", _jsx(_components.h2, { children: "입력" }), "\n", _jsx(_components.p, { children: "8개 줄에 걸쳐서 체스판의 상태가 주어진다. '.'은 빈 칸, '#'는 벽이다. 가장 왼쪽 아랫칸은 항상 벽이 아니다." }), "\n", _jsx(_components.h2, { children: "출력" }), "\n", _jsx(_components.p, { children: "욱제의 캐릭터가 가장 오른쪽 윗 칸에 도착할 수 있으면 1, 없으면 0을 출력한다." }), "\n", _jsx(_components.h2, { children: "풀이" }), "\n", _jsx(_components.p, { children: "이 문제는 위치만으로는 상태를 표현할 수 없고, 시간까지 같이 봐야 한다. 같은 칸이라도 몇 초 뒤에 도착했느냐에 따라 벽 위치가 달라지기 때문이다." }), "\n", _jsxs(_components.p, { children: ["코드에서는 ", _jsx(_components.code, { children: "(x, y, t)" }), " 상태로 BFS를 돌린다. 현재 시간 ", _jsx(_components.code, { children: "t" }), "에 그 칸이 벽이 아니고, 다음 시간 ", _jsx(_components.code, { children: "t+1" }), "에도 벽이 아니어야만 이동 가능하다. 이 조건을 ", _jsx(_components.code, { children: "isNotWall()" }), "에서 검사한다."] }), "\n", _jsxs(_components.p, { children: ["벽은 최대 8초가 지나면 모두 사라지므로, ", _jsx(_components.code, { children: "t >= 8" }), "에 도달하면 사실상 탈출 성공으로 볼 수 있다."] }), "\n", _jsx(_components.p, { children: "또한 이 문제에서는 제자리 대기도 가능하므로, 이동 방향 8개에 현재 위치 유지까지 포함해서 총 9가지 선택을 본다. 지금은 안전해 보여도 다음 초에 벽이 내려와 부딪히는 경우가 있으니, 현재 칸과 다음 칸을 함께 검사해야 한다." }), "\n", _jsxs(_components.p, { children: ["격자 크기가 ", _jsx(_components.code, { children: "8 x 8" }), "로 작아서 시간 차원까지 포함해도 상태 수가 많지 않다. 결국 움직이는 미로를 \"시간에 따라 변하는 그래프\"로 보고 BFS를 돌리는 문제라고 정리할 수 있다."] }), "\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": "cpp", "data-theme": "nord", children: _jsxs(_components.code, { "data-language": "cpp", "data-theme": "nord", style: { display: "grid" }, children: [_jsxs(_components.span, { "data-line": "", children: [_jsx(_components.span, { style: { color: "#5E81AC", fontWeight: "bold" }, children: "#" }), _jsx(_components.span, { style: { color: "#81A1C1" }, children: "include" }), _jsx(_components.span, { style: { color: "#ECEFF4" }, children: " <" }), _jsx(_components.span, { style: { color: "#A3BE8C" }, children: "iostream" }), 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children: ")" })] })] })] })] }), "\n"] }), "\n", _jsx(_components.h2, { children: "마무리" }), "\n", _jsx(_components.p, { children: "움직이는 벽 때문에 시간 축이 반드시 필요하다. 하지만 격자가 작고 벽도 금방 사라져서, 시간까지 포함한 BFS로 충분히 해결된다." }), "\n", _jsx(_components.p, { children: _jsx(_components.img, { src: "/generated/posts/algorithm/boj-16954/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 16954 - 움직이는 미로 탈출