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<h1 class="post-title">
<a class="post-title-link" href="https://imarkofu.github.io/post/mysql-5-7-34-winx64-install/">
mysql-5.7.34-winx64安装
</a>
</h1>
<div class="post-meta">
<span class="meta-item pc-show">
<i class="fa fa-calendar-o"></i>
<span>发布于</span>
<span>2021-06-19</span>
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<span class="pc-show">分类于</span>
<a href="https://imarkofu.github.io/tag/IrVH3x6Yv1n/">
<span>MySQL</span>
</a>
</span>
<span class="post-meta-divider">|</span>
<span class="meta-item">
<i class="fa fa-clock-o"></i>
<span>2分钟</span>
</span>
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<span>303<span class="pc-show">字数</span></span>
</span>
</div>
</header>
<div class="post-body">
<h2 id="下载">下载</h2>
<p>官网[ https://dev.mysql.com/downloads/mysql/5.7.html ]下载mysql5.7.34，选择zip；</p>
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<h1 class="post-title">
<a class="post-title-link" href="https://imarkofu.github.io/post/debian-switch-source/">
Debian 官方源换为国内的源的操作方法
</a>
</h1>
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<span>发布于</span>
<span>2021-06-09</span>
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<span class="pc-show">分类于</span>
<a href="https://imarkofu.github.io/tag/uP-eMausMK8/">
<span>linux</span>
</a>
</span>
<span class="post-meta-divider">|</span>
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<span>4分钟</span>
</span>
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<span>640<span class="pc-show">字数</span></span>
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</div>
</header>
<div class="post-body">
<h2 id="描述">描述</h2>
<p>debian操作系统，apt-get update 报错，采用更换源的方式解决问题。</p>
<pre><code class="language-shell">E: Release file for http://deb.debian.org/debian/dists/buster-updates/InRelease is not valid yet (invalid for another 7h 27min 25s). Updates for this repository will not be applied.
E: Release file for http://security.debian.org/debian-security/dists/buster/updates/InRelease is not valid yet (invalid for another 1h 35min 41s). Updates for this repository will not be applied.
</code></pre>
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<h1 class="post-title">
<a class="post-title-link" href="https://imarkofu.github.io/post/spring-boot-allowed-origins/">
spring boot跨域问题
</a>
</h1>
<div class="post-meta">
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<span>发布于</span>
<span>2021-06-03</span>
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<span class="pc-show">分类于</span>
<a href="https://imarkofu.github.io/tag/aUuOA0b3r/">
<span>spring</span>
</a>
</span>
<span class="post-meta-divider">|</span>
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<span>2分钟</span>
</span>
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<span>409<span class="pc-show">字数</span></span>
</span>
</div>
</header>
<div class="post-body">
<h2 id="描述">描述</h2>
<p>目前应用开发前后端分离是大趋势，故而前后端部署在不同的两个域也是大概率事件，那么势必需要解决跨域请求的问题。</p>
<p>本文描述spring-boot项目中如何解决请求跨域的三种解决方案，以及升级spring-boot 2.4后的跨域问题。</p>
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<a class="post-title-link" href="https://imarkofu.github.io/post/maven-compiler-image-api-not-exist/">
maven项目编译：程序包com.sun.image.codec.jpeg不存在
</a>
</h1>
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<span>发布于</span>
<span>2021-06-03</span>
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<span class="pc-show">分类于</span>
<a href="https://imarkofu.github.io/tag/rgfrKmU1i-l/">
<span>maven</span>
</a>
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<span>2分钟</span>
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<h2 id="描述">描述</h2>
<p>maven编译项目提示<br>
程序包com.sun.image.codec.jpeg不存在<br>
然后这个类位于：jre/lib/rt.jar</p>
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<a class="post-title-link" href="https://imarkofu.github.io/post/git-bash-filename-too-long/">
git bash下的Filename too long
</a>
</h1>
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<span>发布于</span>
<span>2021-06-02</span>
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<span>git</span>
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<h2 id="描述">描述</h2>
<p>从github克隆一个项目下发出现了错误：</p>
<pre><code class="language-shell">cglong@cglong MINGW64 /c/Tools/workspace/idea/open
$ git clone [email protected]:imarkofu/shenyu.git
Cloning into 'shenyu'...
Warning: Permanently added the RSA host key for IP address '52.192.72.89' to the list of known hosts.
remote: Enumerating objects: 53479, done.
remote: Counting objects: 100% (15170/15170), done.
remote: Compressing objects: 100% (4534/4534), done.
remote: Total 53479 (delta 4593), reused 14765 (delta 4365), pack-reused 38309
Receiving objects: 100% (53479/53479), 20.72 MiB | 128.00 KiB/s, done.
Resolving deltas: 100% (17773/17773), done.
error: unable to create file shenyu-spring-boot-starter/shenyu-spring-boot-starter-sync-data-center/shenyu-spring-boot-starter-sync-data-websocket/src/main/java/org/apache/shenyu/springboot/starter/sync/data/websocket/WebsocketSyncDataConfiguration.java: Filename too long
error: unable to create file shenyu-spring-boot-starter/shenyu-spring-boot-starter-sync-data-center/shenyu-spring-boot-starter-sync-data-websocket/src/test/java/org/apache/shenyu/springboot/starter/sync/data/websocket/WebsocketSyncDataConfigurationTest.java: Filename too long
Checking out files: 100% (1439/1439), done.
fatal: unable to checkout working tree
warning: Clone succeeded, but checkout failed.
You can inspect what was checked out with 'git status'
and retry the checkout with 'git checkout -f HEAD'
</code></pre>
<p>git可以创建4096长度的路径，然而Windows 默认不支持文件名或目录名长于260个字符，所以Git的Windows客户端默认是禁用长名称支持的。</p>
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CentOS6编译安装Python3.7
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<p>准备编译环境</p>
<pre><code class="language-shell">yum install zlib-devel bzip2-devel openssl-devel ncurses-devel xz gcc-c++ gcc libffi-devel -y
</code></pre>
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ekho中文TTS CentOS6编译安装
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<span>中文TTS</span>
</a>、
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<span>ekho</span>
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<p>Ekho（余音）是一个免费、开源的中文语音合成软件。它目前支持粤语、普通话（国语）、广东台山话、诏安客语、藏语、雅言（中国古代通用语）和韩语（试验中），英语则通过eSpeak或Festival间接实现。Ekho支持Linux、Windows和Android平台。</p>
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算法学习-动态规划
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<span>数据结构</span>
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<p><strong>动态规划</strong>（英语：Dynamic programming，简称DP）是一种在数学、管理科学、计算机科学、经济学和生物信息学中使用的，通过把原问题分解为相对简单的子问题的方式求解复杂问题的方法。</p>
<p>动态规划常常适用于<strong>有重叠子问题</strong>和<strong>最优子结构性质</strong>的问题，动态规划方法所耗时间往往远少于朴素解法。</p>
<p>动态规划背后的基本思想非常简单。大致上，若要解一个给定问题，我们需要解其不同部分（即子问题），再根据子问题的解以得出原问题的解。</p>
<p>通常许多子问题非常相似，为此动态规划法试图仅仅解决每个子问题一次，从而减少计算量：一旦某个给定子问题的解已经算出，则将其记忆化存储，以便下次需要同一个子问题解之时直接查表。这种做法在重复子问题的数目关于输入的规模呈指数增长时特别有用。</p>
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<p>所谓贪心算法是指，在对问题求解时，总是做出在当前看来是最好的选择。也就是说，不从整体最优上加以考虑，他所做出的仅是在某种意义上的局部最优解。</p>
<p>贪心算法没有固定的算法框架，算法设计的关键是贪心策略的选择。必须注意的是，贪心算法不是对所有问题都能得到整体最优解，选择的贪心策略必须具备无后效性，即某个状态以后的过程不会影响以前的状态，只与当前状态有关。</p>
<p>所以对所采用的贪心策略一定要仔细分析其是否满足无后效性。</p>
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<h1 id="递归">递归</h1>
<p>直接或者间接不断反复调用自身来达到解决问题的方法。要求原始问题可以分解为相同问题的子问题。</p>
<p><strong>先决条件</strong></p>
<ul>
<li>递归边界</li>
<li>自身调用</li>
</ul>
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