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 P0的题目是手写Trie树以及利用Copy-On-Write让Trie树可以同时被多个Reader和一个Writer访问，这个在原理实在算不上难。让笔者头疼的是Modern C++的语法。现记录如下，可供有一点基础（指除编程外的各科目知识）但也不是完全懂的后来者（大家都是半吊子）参考。
 关 ...</div></div></div><div class="recent-post-item"><div class="recent-post-info no-cover"><a class="article-title" href="/2021/11/24/J1900-setting/" title="记一次折腾J1900的经历">记一次折腾J1900的经历</a><div class="article-meta-wrap"><span class="post-meta-date"><i class="far fa-calendar-alt"></i><span class="article-meta-label">发表于</span><time datetime="2021-11-24T14:03:42.000Z" title="发表于 2021-11-24 22:03:42">2021-11-24</time></span></div><div class="content">第一次整软路由，笔者正处于大创报账时期，虽然不知道能不能报上去，反正挑了个合适价位的J1900的软路由买回来一阵折腾。由于怀着着折腾的心思，买的是裸主机，这意味着内存和硬盘都没有自带，同时openwrt系统就更不用说了，肯定得自己装上去。在收货当天笔者就开始了各项工作，结果还是花了好几天踩坑才将一切搞定，故记下这次极其耗神的工作。
 软路由是什么按笔者目前理解，软路由就是一台至少带了多个网口的过时主机，CPU、内存、硬盘等基本一应俱全。笔者手里这台就是J1900CPU、四网口的一台软路由，双十二期间价钱720+就拿下来了。拥有复数个网口后，只要在主机上装一个openwrt系统，再给网口分配LAN口和WAN口，这台主机就是软路由了。换言之，只要有两个网口，任何电脑都可以改成软路由，只是功耗等不尽相同罢了。与软路由相对的就是——硬路由，也就是一般我们称呼的路由器，软路由一般应用在有线网中，至于无线网则会靠额外连接一个无线AP来实现，而硬路由则集成这两项功能且更简单易用，当然价钱多少会高上一点。
-J1900路由器介绍先来张内部结构图：图中的已经装好了内存条，可以看到硬盘上圈出来的分别是网卡接口 ...</div></div></div><nav id="pagination"><div class="pagination"><span class="page-number current">1</span></div></nav></div><div class="aside-content" id="aside-content"><div class="card-widget card-info"><div class="is-center"><div class="avatar-img"><img src="/img/avatar.jpg" onerror="this.onerror=null;this.src='/img/friend_404.gif'" alt="avatar"/></div><div class="author-info__name">羽殇之舞</div><div class="author-info__description">大三上开始摸鱼的博客，不会真的有人看吧，不会吧不会吧</div></div><div class="card-info-data site-data is-center"><a href="/archives/"><div class="headline">文章</div><div class="length-num">5</div></a><a href="/tags/"><div class="headline">标签</div><div class="length-num">1</div></a><a href="/categories/"><div class="headline">分类</div><div class="length-num">0</div></a></div><a id="card-info-btn" target="_blank" rel="noopener" href="https://github.com/GG2002"><i class="fab fa-github"></i><span>Follow Me</span></a><div 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