164 lines
19 KiB
HTML
164 lines
19 KiB
HTML
<!DOCTYPE html>
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<html lang="ko">
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<head>
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<meta charset="UTF-8" />
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<meta name="viewport" content="width=device-width, initial-scale=1.0" />
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<title>BOJ 18244 - Offline</title>
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<style>
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:root {
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--bg: #fafaf8;
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--paper: #ffffff;
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--ink: #1e1f24;
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--muted: #6a6d75;
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--line: #d8dce3;
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--accent: #0d6e6e;
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--code-bg: #f4f6fb;
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}
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* { box-sizing: border-box; }
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body {
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margin: 0;
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background:
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radial-gradient(circle at 15% 0%, #f0efe9 0%, transparent 42%),
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radial-gradient(circle at 85% 20%, #e7f1f2 0%, transparent 38%),
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var(--bg);
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color: var(--ink);
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font-family: "Noto Sans KR", "Pretendard", "Apple SD Gothic Neo", sans-serif;
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line-height: 1.65;
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}
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main {
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max-width: 980px;
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margin: 0 auto;
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padding: 24px 16px 56px;
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}
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.header {
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background: var(--paper);
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border: 1px solid var(--line);
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border-radius: 14px;
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padding: 18px 20px;
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margin-bottom: 18px;
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}
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.header h1 { margin: 0 0 6px; font-size: 1.5rem; }
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.header p { margin: 0; color: var(--muted); font-size: 0.95rem; }
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.header a { color: var(--accent); text-decoration: none; }
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.section {
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background: var(--paper);
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border: 1px solid var(--line);
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border-radius: 14px;
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padding: 16px 18px;
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margin-bottom: 14px;
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overflow-x: auto;
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}
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h2 {
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margin: 0 0 10px;
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font-size: 1.05rem;
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color: var(--accent);
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border-bottom: 1px solid var(--line);
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padding-bottom: 8px;
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}
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pre, code {
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font-family: "JetBrains Mono", "Fira Code", monospace;
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background: var(--code-bg);
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}
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pre {
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padding: 12px;
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border-radius: 10px;
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border: 1px solid #e7ebf2;
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overflow: auto;
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}
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blockquote {
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margin: 14px 0;
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padding: 16px 16px 14px 22px;
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border-left: 4px solid var(--accent);
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border-radius: 10px;
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background: linear-gradient(90deg, #eef8f8 0%, #f9fdfd 100%);
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color: #24313a;
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font-weight: 600;
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position: relative;
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}
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blockquote::before {
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content: "“";
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position: absolute;
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left: 8px;
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top: 2px;
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font-size: 1.35rem;
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line-height: 1;
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color: #0b5f5f;
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opacity: 0.7;
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}
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blockquote > :first-child { margin-top: 0; }
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blockquote > :last-child { margin-bottom: 0; }
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q {
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color: #114f50;
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font-weight: 700;
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background: #edf8f8;
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border-radius: 6px;
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padding: 0 4px;
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}
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.math-inline math {
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font-size: 1em;
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vertical-align: middle;
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}
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.math-block {
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margin: 10px 0;
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padding: 8px 10px;
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overflow-x: auto;
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background: #f8fbff;
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border: 1px solid #e2ecf8;
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border-radius: 8px;
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}
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.math-block math {
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font-size: 1.04em;
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display: block;
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}
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table { border-collapse: collapse; width: 100%; }
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th, td { border: 1px solid var(--line); padding: 6px 8px; }
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img { max-width: 100%; height: auto; }
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</style>
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</head>
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<body>
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<main>
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<header class="header">
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<h1>변형 계단 수</h1>
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</header>
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<article class="section">
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<h2>문제</h2>
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<p>45656이란 수를 보자.</p>
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<p>이 수는 인접한 모든 자릿수의 차이가 1이 난다. 이런 수를 <a href="https://www.acmicpc.net/problem/10844">계단 수</a>라고 한다.</p>
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<p>재현이는 계단 수에 조건을 하나 추가하여 <strong>변형 계단 수</strong>라고 부르려고 한다. 조건은 이러하다.</p>
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<ul>
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<li>인접한 자릿수는 연속으로 3번 이상 증가하거나 감소할 수 없다.</li>
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</ul>
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<p>예를 들어, 45656이란 수는 변형 계단 수이지만 45676은 4567에서 인접한 자릿수가 연속으로 3번 증가하였으므로 변형 계단 수가 아니다.</p>
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<p style="text-align: center;"><img alt="" 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" style="height: 176px; width: 400px;" /></p>
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<p>그럼, 오늘도 역시 세준이는 수의 길이가 N인 변형 계단 수가 몇 개 있는지 궁금해졌다.</p>
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<p>N이 주어질 때, 길이가 N인 변형 계단 수가 총 몇 개 있는지 구하는 프로그램을 작성하시오. (변형 계단 수는 0으로 시작할 수 있다.)</p>
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</article>
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<article class="section">
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<h2>입력</h2>
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<p>첫째 줄에 N이 주어진다. N은 1보다 크거나 같고, 100보다 작거나 같은 자연수이다.</p>
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</article>
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<article class="section">
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<h2>출력</h2>
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<p>첫째 줄에 정답을 1,000,000,007으로 나눈 나머지를 출력한다.</p>
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</article>
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<article class="section">
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<h2>예제 입력 1 복사</h2>
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<pre class="sampledata" id="sample-input-1">4
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</pre>
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</article>
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<article class="section">
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<h2>예제 출력 1 복사</h2>
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<pre class="sampledata" id="sample-output-1">50
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</pre>
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</article>
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</main>
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</body>
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</html>
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