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CodeObject/storage/zeta/_static/32720.html
2026-04-27 09:44:16 +09:00

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<!DOCTYPE html>
<html lang="ko">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>BOJ 32720 - Offline</title>
<style>
:root {
--bg: #fafaf8;
--paper: #ffffff;
--ink: #1e1f24;
--muted: #6a6d75;
--line: #d8dce3;
--accent: #0d6e6e;
--code-bg: #f4f6fb;
}
* { box-sizing: border-box; }
body {
margin: 0;
background:
radial-gradient(circle at 15% 0%, #f0efe9 0%, transparent 42%),
radial-gradient(circle at 85% 20%, #e7f1f2 0%, transparent 38%),
var(--bg);
color: var(--ink);
font-family: "Noto Sans KR", "Pretendard", "Apple SD Gothic Neo", sans-serif;
line-height: 1.65;
}
main {
max-width: 980px;
margin: 0 auto;
padding: 24px 16px 56px;
}
.header {
background: var(--paper);
border: 1px solid var(--line);
border-radius: 14px;
padding: 18px 20px;
margin-bottom: 18px;
}
.header h1 { margin: 0 0 6px; font-size: 1.5rem; }
.header p { margin: 0; color: var(--muted); font-size: 0.95rem; }
.header a { color: var(--accent); text-decoration: none; }
.section {
background: var(--paper);
border: 1px solid var(--line);
border-radius: 14px;
padding: 16px 18px;
margin-bottom: 14px;
overflow-x: auto;
}
h2 {
margin: 0 0 10px;
font-size: 1.05rem;
color: var(--accent);
border-bottom: 1px solid var(--line);
padding-bottom: 8px;
}
pre, code {
font-family: "JetBrains Mono", "Fira Code", monospace;
background: var(--code-bg);
}
pre {
padding: 12px;
border-radius: 10px;
border: 1px solid #e7ebf2;
overflow: auto;
}
blockquote {
margin: 14px 0;
padding: 16px 16px 14px 22px;
border-left: 4px solid var(--accent);
border-radius: 10px;
background: linear-gradient(90deg, #eef8f8 0%, #f9fdfd 100%);
color: #24313a;
font-weight: 600;
position: relative;
}
blockquote::before {
content: "“";
position: absolute;
left: 8px;
top: 2px;
font-size: 1.35rem;
line-height: 1;
color: #0b5f5f;
opacity: 0.7;
}
blockquote > :first-child { margin-top: 0; }
blockquote > :last-child { margin-bottom: 0; }
q {
color: #114f50;
font-weight: 700;
background: #edf8f8;
border-radius: 6px;
padding: 0 4px;
}
.math-inline math {
font-size: 1em;
vertical-align: middle;
}
.math-block {
margin: 10px 0;
padding: 8px 10px;
overflow-x: auto;
background: #f8fbff;
border: 1px solid #e2ecf8;
border-radius: 8px;
}
.math-block math {
font-size: 1.04em;
display: block;
}
table { border-collapse: collapse; width: 100%; }
th, td { border: 1px solid var(--line); padding: 6px 8px; }
img { max-width: 100%; height: auto; }
</style>
</head>
<body>
<main>
<header class="header">
<h1>순열과 증가수열</h1>
</header>
<article class="section">
<h2>문제</h2>
<p>순열을 가지고 놀던 건덕이는 자신이 만든 수열의 아름다운 성질을 찾게 되었다. 그의 순열 <span class="math-inline"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mi>A</mi></mrow></math></span>는 다음과 같은 특별한 성질을 만족한다.</p>
<ul>
<li>순열 <span class="math-inline"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mi>A</mi></mrow></math></span><span class="math-inline"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mn>1</mn></mrow></math></span>부터 <span class="math-inline"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mi>N</mi></mrow></math></span>까지의 모든 정수를 한 번씩 포함하고 있다.</li>
<li>순열 <span class="math-inline"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mi>A</mi></mrow></math></span>의 연속된 <span class="math-inline"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mi>K</mi></mrow></math></span>개의 항을 더하여 구성된 수열 <span class="math-inline"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mi>B</mi></mrow></math></span>는 증가 수열로, <span class="math-inline"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mi>B</mi><mi>i</mi></msub><mo>&#x0003D;</mo><msub><mi>A</mi><mi>i</mi></msub><mo>&#x0002B;</mo><msub><mi>A</mi><mrow><mi>i</mi><mo>&#x0002B;</mo><mn>1</mn></mrow></msub><mo>&#x0002B;</mo><mo>&#x022EF;</mo><mo>&#x0002B;</mo><msub><mi>A</mi><mrow><mi>i</mi><mo>&#x0002B;</mo><mi>K</mi><mo>&#x02212;</mo><mn>1</mn></mrow></msub><mrow><mo stretchy="true" fence="true" form="prefix">&#x00028;</mo><mn>1</mn><mo>&#x02264;</mo><mi>i</mi><mo>&#x02264;</mo><mi>N</mi><mo>&#x02212;</mo><mi>K</mi><mo>&#x0002B;</mo><mn>1</mn><mo stretchy="true" fence="true" form="postfix">&#x00029;</mo></mrow></mrow></math></span>이다.</li>
</ul>
<p>예를 들어, <span class="math-inline"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mi>A</mi><mo>&#x0003D;</mo><mo stretchy="false">&#x0007B;</mo><mn>1</mn><mo>&#x0002C;</mo><mn>3</mn><mo>&#x0002C;</mo><mn>2</mn><mo>&#x0002C;</mo><mn>5</mn><mo>&#x0002C;</mo><mn>4</mn><mo stretchy="false">&#x0007D;</mo></mrow></math></span>, <span class="math-inline"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mi>K</mi><mo>&#x0003D;</mo><mn>3</mn></mrow></math></span>일 경우, <span class="math-inline"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mi>B</mi><mo>&#x0003D;</mo><mo stretchy="false">&#x0007B;</mo><mn>6</mn><mo>&#x0002C;</mo><mn>10</mn><mo>&#x0002C;</mo><mn>11</mn><mo stretchy="false">&#x0007D;</mo></mrow></math></span>이므로, 두 가지 조건을 모두 만족시킨다.</p>
<p>건덕이는 이런 성질을 만족하는 순열 <span class="math-inline"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mi>A</mi></mrow></math></span>가 몇 가지나 존재하는지 궁금해졌다. 건덕이를 도와 <span class="math-inline"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mi>N</mi></mrow></math></span><span class="math-inline"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mi>K</mi></mrow></math></span>가 주어졌을 때, 위 성질을 만족하는 순열의 개수를 구해주자!</p>
</article>
<article class="section">
<h2>입력</h2>
<p>첫째 줄에 순열의 길이 <span class="math-inline"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mi>N</mi></mrow></math></span>과 연속으로 더해지는 항의 개수 <span class="math-inline"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mi>K</mi></mrow></math></span>가 공백으로 구분되어 주어진다. <span class="math-inline"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mrow><mo stretchy="true" fence="true" form="prefix">&#x00028;</mo><mn>1</mn><mo>&#x02264;</mo><mi>K</mi><mo>&#x02264;</mo><mi>N</mi><mo>&#x02264;</mo><mn>1</mn><mo>&#x0002C;</mo><mn>000</mn><mo>&#x0002C;</mo><mn>000</mn><mo stretchy="true" fence="true" form="postfix">&#x00029;</mo></mrow></mrow></math></span></p>
</article>
<article class="section">
<h2>출력</h2>
<p>길이가 <span class="math-inline"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mi>N</mi></mrow></math></span>인 순열 중, 위 성질을 만족시키는 순열의 개수를 <span class="math-inline"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msup><mn>10</mn><mn>9</mn></msup><mo>&#x0002B;</mo><mn>7</mn></mrow></math></span>로 나눈 나머지를 출력한다.</p>
</article>
<article class="section">
<h2>예제 입력 1 복사</h2>
<pre class="sampledata" id="sample-input-1">4 3
</pre>
</article>
<article class="section">
<h2>예제 출력 1 복사</h2>
<pre class="sampledata" id="sample-output-1">12
</pre>
</article>
</main>
</body>
</html>