"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/2239", children: "문제 링크" }) }), "\n", _jsx(_components.h2, { children: "문제" }), "\n", _jsx(_components.p, { children: "스도쿠는 매우 간단한 숫자 퍼즐이다. 9×9 크기의 보드가 있을 때, 각 행과 각 열, 그리고 9개의 3×3 크기의 보드에 1부터 9까지의 숫자가 중복 없이 나타나도록 보드를 채우면 된다. 예를 들어 다음을 보자." }), "\n", _jsx(_components.p, { children: _jsx(_components.img, { src: "/generated/posts/algorithm/boj-2239/assets/img1.png", alt: "" }) }), "\n", _jsx(_components.p, { children: "위 그림은 참 잘도 스도쿠 퍼즐을 푼 경우이다. 각 행에 1부터 9까지의 숫자가 중복 없이 나오고, 각 열에 1부터 9까지의 숫자가 중복 없이 나오고, 각 3×3짜리 사각형(9개이며, 위에서 색깔로 표시되었다)에 1부터 9까지의 숫자가 중복 없이 나오기 때문이다." }), "\n", _jsx(_components.p, { children: "하다 만 스도쿠 퍼즐이 주어졌을 때, 마저 끝내는 프로그램을 작성하시오." }), "\n", _jsx(_components.h2, { children: "입력" }), "\n", _jsx(_components.p, { children: "9개의 줄에 9개의 숫자로 보드가 입력된다. 아직 숫자가 채워지지 않은 칸에는 0이 주어진다." }), "\n", _jsx(_components.h2, { children: "출력" }), "\n", _jsx(_components.p, { children: "9개의 줄에 9개의 숫자로 답을 출력한다. 답이 여러 개 있다면 그 중 사전식으로 앞서는 것을 출력한다. 즉, 81자리의 수가 제일 작은 경우를 출력한다." }), "\n", _jsx(_components.h2, { children: "풀이" }), "\n", _jsx(_components.p, { children: "빈 칸을 하나씩 채워 가며 가능한 수를 시도하는 전형적인 백트래킹 문제다. 한 칸에 숫자를 넣을 수 있는지는 같은 행, 같은 열, 같은 3 x 3 칸만 보면 판정할 수 있다." }), "\n", _jsx(_components.p, { children: "코드에서는 빈 칸 목록을 모아 두고, 현재 칸에 1부터 9까지 가능한 숫자를 넣어 본다. 조건을 만족하면 다음 칸으로 재귀를 이어 가고, 끝까지 완성되면 그대로 정답을 출력한다." }), "\n", _jsx(_components.p, { children: "핵심은 유효성 검사와 되돌리기다." }), "\n", _jsx(_components.h2, { children: "코드" }), "\n", _jsx(_components.figure, { "data-rehype-pretty-code-figure": "", 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_jsx(_components.span, { style: { color: "#ECEFF4" }, children: "[" }), _jsx(_components.span, { style: { color: "#D8DEE9FF" }, children: "x" }), _jsx(_components.span, { style: { color: "#ECEFF4" }, children: "][" }), _jsx(_components.span, { style: { color: "#D8DEE9FF" }, children: "y" }), _jsx(_components.span, { style: { color: "#ECEFF4" }, children: "]" }), _jsx(_components.span, { style: { color: "#81A1C1" }, children: " =" }), _jsx(_components.span, { style: { color: "#B48EAD" }, children: " 0" }), _jsx(_components.span, { style: { color: "#81A1C1" }, children: ";" })] }), "\n", _jsx(_components.span, { "data-line": "", children: _jsx(_components.span, { style: { color: "#ECEFF4" }, children: " }" }) }), "\n", _jsx(_components.span, { "data-line": "", children: _jsx(_components.span, { style: { color: "#ECEFF4" }, children: " }" }) }), "\n", _jsx(_components.span, { "data-line": "", children: _jsx(_components.span, { style: { color: "#ECEFF4" }, children: " }" }) }), "\n", _jsx(_components.span, { "data-line": "", children: _jsx(_components.span, { style: { color: "#ECEFF4" }, children: "}" }) })] }) }) }), "\n", _jsx(_components.h2, { children: "복잡도" }), "\n", _jsxs(_components.ul, { children: ["\n", _jsx(_components.li, { children: "시간 복잡도: 입력에 따라 달라지는 백트래킹 탐색" }), "\n", _jsxs(_components.li, { children: ["공간 복잡도: 보드와 재귀 스택 기준 ", _jsx(_components.code, { children: "O(1)" }), "에 가깝다"] }), "\n"] }), "\n", _jsx(_components.h2, { children: "마무리" }), "\n", _jsx(_components.p, { children: "스도쿠는 결국 가능한 숫자만 조심해서 넣어 보는 백트래킹이다. 행, 열, 칸 검사만 정확하면 정답은 재귀가 찾아준다." }), "\n", _jsx(_components.p, { children: _jsx(_components.img, { src: "/generated/posts/algorithm/boj-2239/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 2239 - 스도쿠