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<!DOCTYPE html>
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<p>本博客为清华大学“工程热力学”课程的复习笔记（持续更新中）。</p>
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<p>本文为清华大学”模式识别与机器学习”课程的复习笔记（$\text{Full Version}$)。</p>
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<p>本文为清华大学”模式识别与机器学习”课程的复习笔记。</p>
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<a class="has-link-black-ter" href="/2024/03/13/CF1898E/">CF1898E Sofia and Strings</a>
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<h3 id="题目大意"><a href="#题目大意" class="headerlink" title="题目大意"></a>题目大意</h3><p>给定两种对字符串的操作:</p>
<ol>
<li>删除字符串第 $i$ 位的字符。</li>
<li>选择 $[l, r]$, 将 $s_{[l, r]}$ 的字符串按字典序排序。</li>
</ol>
<p>现在有长为 $n, m$ 的字符串 $s, t$, 问是否能通过这两种操作把 $s$ 变成 $t$。</p>
<p>多组数据 $, 1 \leq n, m, \sum n, \sum m\leq 2 \times 10^5, 1 \leq t \leq 10 ^ 4$</p>
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<p>记录一些想要自学的 Courses (Maybe Sorted)</p>
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<p>博主考上清华了！</p>
<p>本博客以后会记录一些博主的大学生活。</p>
<p>（同时也是博客迁移到新电脑后的第一篇post！）</p>
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<a class="has-link-black-ter" href="/2022/04/10/GYM103415K/">GYM103415K Magus Night</a>
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<h3 id="简要题意"><a href="#简要题意" class="headerlink" title="简要题意"></a>简要题意</h3><p>对所有长度为 $n$ ，元素不超过 $m$ ，$\texttt{lcm} \ge p$，$\texttt{gcd} \le q$ 数列求积的和</p>
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<h3 id="题目大意"><a href="#题目大意" class="headerlink" title="题目大意"></a>题目大意</h3><p>有一只青蛙掉到了井底，这口井被划分为 $n+1$ 个位置，井口是 $0$ ，井<br>底是 $n$ 。</p>
<p>现在这只青蛙想跳出这口井，假设它当前在位置 $i$，则它可以向上跳 $0$ 到 $a_i$ 的任意整数距离。</p>
<p>又因为井口很滑，所以如果青蛙跳到了位置 $j$，则它会往下滑 $b_j$ 个位置。</p>
<p>给定 $n, a, b$，你需要求出青蛙最少跳多少次才能跳出井（跳到位置 $0$ ），并给出方案。</p>
<p>$1 \leq n \leq 3 \times 10^5$ </p>
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<p>$ \texttt{0 x y v：}$ 在 $x,y$ 间添加一条权值为 $v$ 的边。</p>
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