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<h1>北尘聆音の小窝</h1>
<h3></h3>
<h5>欢迎你来看我</h5>
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<h2 class="post-title">LeetCode解题记-108</h2>
</a>
<div class="category-and-date">
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2025/1/18
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<h3 id="108-将有序数组转换为二叉搜索树"><a href="#108-将有序数组转换为二叉搜索树" class="headerlink" title="108. 将有序数组转换为二叉搜索树"></a>108. 将有序数组转换为二叉搜索树</h3><h5 id="二叉树的操作"><a href="#二叉树的操作" class="headerlink" title="二叉树的操作"></a>二叉树的操作</h5><p>给你一个整数数组 <code>nums</code> ，其中元素已经按 <strong>升序</strong>排列，请你将其转换为一棵 <strong>平衡</strong>二叉搜索树。</p>
<p><strong>示例 1：</strong></p>
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<a href="/LeetCode%E8%A7%A3%E9%A2%98%E8%AE%B0-202/">
<h2 class="post-title">LeetCode解题记-202</h2>
</a>
<div class="category-and-date">
<span class="date">
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</span>
2025/1/11
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<div class="content" v-pre>
<h3 id="202-快乐数"><a href="#202-快乐数" class="headerlink" title="202.快乐数"></a>202.快乐数</h3><h5 id="快慢指针的用法"><a href="#快慢指针的用法" class="headerlink" title="快慢指针的用法"></a>快慢指针的用法</h5><p>对于这道题，我认为最关键的一点是能不能找到以下三种可能，并且理解为什么第三种情况永远不会发生：</p>
<ol>
<li>最终会得到 1。</li>
<li>最终会进入循环。</li>
<li>值会越来越大，最后接近无穷大。</li>
</ol>
<p>根据下表，可以知道对于 3 位数的数字，它不可能大于 243。这意味着它要么被困在 243 以下的循环内，要么跌到 1。4 位或 </p>
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</div>
<div class="post">
<a href="/15%E7%A7%8D%E7%AE%97%E6%B3%95%E6%A8%A1%E5%BC%8F/">
<h2 class="post-title">15种算法模式</h2>
</a>
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2025/1/9
</span>
</div>
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<div class="content" v-pre>
<h2 id="1-前缀和（Prefix-Sum）"><a href="#1-前缀和（Prefix-Sum）" class="headerlink" title="1. 前缀和（Prefix Sum）"></a>1. 前缀和（Prefix Sum）</h2><p><strong>适用场景</strong>: 当你需要对子数组进行多次求和查询，或者需要计算累加和时。</p>
<p><strong>示例问题</strong>: 给定一个数组<code>nums</code>，回答关于特定区间[i, j]内元素之和的多个查询。</p>
<ul>
<li>输入：<code>nums = [1, 2, 3, 4, 5, 6]</code>，i = 1，j = 3</li>
<li>输出：9</li>
<li>解释：预处理数组A以创建前缀和数组：P = [1, 3, 6, 10, 15, 21]。要找出索引i和j之间的元素和，使用公式：P[j] - P[i - 1]。</li>
</ul>
<p><strong>力扣相关题目</strong>:</p>
</div>
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<a href="/Mybatis%E7%9A%84%E4%BA%8B%E5%8A%A1%E7%AE%A1%E7%90%86%E6%9C%BA%E5%88%B6/">
<h2 class="post-title">Mybatis的事务管理机制</h2>
</a>
<div class="category-and-date">
<span class="date">
<span class="icon">
<i class="fa-solid fa-calendar fa-fw"></i>
</span>
2025/1/4
</span>
</div>
<div class="description">
<div class="content" v-pre>
<p>在<code>mybatis-config.xml</code>文件中，可以通过以下配置进行MyBatis的事务管理：</p>
<pre><code class="xml"><transactionManager type="JDBC"/>
</code></pre>
<p>type属性的值包括两个选项，不区分大小写：</p>
<ul>
<li><code>JDBC</code></li>
<li><code>MANAGED</code></li>
</ul>
<p>换句话说，MyBatis提供了两种事务管理机制：</p>
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</div>
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<a href="/LeetCode%E8%A7%A3%E9%A2%98%E8%AE%B0-643/">
<h2 class="post-title">LeetCode解题记-643</h2>
</a>
<div class="category-and-date">
<span class="date">
<span class="icon">
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</span>
2025/1/2
</span>
</div>
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<h3 id="643-子数组最大平均数-I"><a href="#643-子数组最大平均数-I" class="headerlink" title="643. 子数组最大平均数 I"></a>643. 子数组最大平均数 I</h3><h5 id="滑动窗口算法的学习"><a href="#滑动窗口算法的学习" class="headerlink" title="滑动窗口算法的学习"></a>滑动窗口算法的学习</h5><p>给你一个由 <code>n</code> 个元素组成的整数数组 <code>nums</code> 和一个整数 <code>k</code> 。</p>
<p>请你找出平均数最大且 <strong>长度为 <code>k</code></strong> 的连续子数组，并输出该最大平均数。</p>
<p>任何误差小于10^-5的答案都将被视为正确答案。</p>
<p><strong>示例 1：</strong></p>
</div>
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</div>
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<a href="/%E5%BC%80%E5%8F%91%E6%88%91%E7%9A%84%E7%AC%AC%E4%B8%80%E4%B8%AA%20MyBatis%20%E7%A8%8B%E5%BA%8F/">
<h2 class="post-title">开发我的第一个 MyBatis 程序</h2>
</a>
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<h1 id=""><a href="#" class="headerlink" title=""></a></h1><h2 id="1-resources-目录"><a href="#1-resources-目录" class="headerlink" title="1. resources 目录"></a>1. resources 目录</h2><ul>
<li>放在这个目录当中的一般都是资源、配置文件。</li>
<li>直接放在 <code>resources</code> 目录下的资源等同于放到类的根路径下。</li>
</ul>
<h2 id="2-开发步骤"><a href="#2-开发步骤" class="headerlink" title="2. 开发步骤"></a>2. 开发步骤</h2><ol>
<li><p>打包方式：<code>jar</code></p>
</li>
<li><p>引入 MyBatis 依赖，MySQL 驱动。</p>
</div>
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<h2 class="post-title">我的第一篇文章</h2>
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2024/12/27
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<p>花了一天，终于建好了这个博客，让我来看看这个测试文章效果如何</p>
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Based on the <a target="_blank" rel="noopener" href="https://hexo.io">Hexo Engine</a> &
<a target="_blank" rel="noopener" href="https://github.com/theme-particlex/hexo-theme-particlex">ParticleX Theme</a>
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