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<h1 class="post-title" itemprop="name headline">ARTS 第一周</h1>
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<p>
<a href="https://www.zhihu.com/question/301150832" target="_blank" rel="external nofollow noopener noreferrer">《左耳听风》发起的ARTS挑战</a>
</p>
<blockquote>
<p>
<strong>Algorithm</strong>。
<strong>主要是为了编程训练和学习。</strong>每周至少做一个 leetcode 的算法题（先从Easy开始，然后再Medium，最后才Hard）。进行编程训练，如果不训练你看再多的算法书，你依然不会做算法题，看完书后，你需要训练。关于做Leetcode的的优势，你可以看一下我在coolshell上的文章
<a href="https://link.zhihu.com/?target=https%3A//coolshell.cn/articles/12052.html"
target="_blank" rel="external nofollow noopener noreferrer">Leetcode 编程训练 - 酷 壳 - CoolShell</a>。</p>
<p>
<strong>Review：主要是为了学习英文，如果你的英文不行，你基本上无缘技术高手。</strong>所以，需要你阅读并点评至少一篇英文技术文章，我个人最喜欢去的地方是
<a href="https://link.zhihu.com/?target=http%3A//Medium.com" target="_blank" rel="external nofollow noopener noreferrer">http://Medium.com</a>（需要梯子）以及各个公司的技术blog，如Netflix的。</p>
<p>
<strong>Tip：主要是为了总结和归纳你在是常工作中所遇到的知识点</strong>。学习至少一个技术技巧。你在工作中遇到的问题，踩过的坑，学习的点滴知识。</p>
<p>
<strong>Share：主要是为了建立你的影响力，能够输出价值观。</strong>分享一篇有观点和思考的技术文章。</p>
<p>作者：陈皓</p>
</blockquote>
<a id="more"></a>
<h3 id="Algorithm">
<a href="#Algorithm" class="headerlink" title="Algorithm"></a>Algorithm</h3>
<p>上次写了几个题，这次接着继续主要是easy和medium</p>
<p>这次是medium：
<a href="https://leetcode.com/problems/string-to-integer-atoi" target="_blank" rel="external nofollow noopener noreferrer">字符串转数值</a>
</p>
<figure class="highlight go">
<table>
<tr>
<td class="gutter">
<pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br></pre>
</td>
<td class="code">
<pre><span class="line"><span class="function"><span class="keyword">func</span> <span class="title">myAtoi</span><span class="params">(str <span class="keyword">string</span>)</span> <span class="title">int</span></span> {</span><br><span class="line"> <span class="keyword">var</span> (</span><br><span class="line"> isNegative = <span class="number">0</span></span><br><span class="line"> validLen <span class="keyword">int32</span></span><br><span class="line"> startNum <span class="keyword">bool</span></span><br><span class="line"> Max = <span class="number">2</span> << <span class="number">30</span></span><br><span class="line"> MaxPre = <span class="number">2</span> << <span class="number">30</span> / <span class="number">10</span></span><br><span class="line"> )</span><br><span class="line"></span><br><span class="line"> l := <span class="built_in">len</span>(str)</span><br><span class="line"> <span class="keyword">var</span> result <span class="keyword">int</span></span><br><span class="line">LOOP:</span><br><span class="line"> <span class="keyword">for</span> i := <span class="number">0</span>; i < l; i++ {</span><br><span class="line"> <span class="keyword">switch</span> {</span><br><span class="line"> <span class="keyword">case</span> !startNum && isNegative == <span class="number">0</span> && str[i] == <span class="string">' '</span>:</span><br><span class="line"> <span class="keyword">continue</span></span><br><span class="line"> <span class="keyword">case</span> !startNum && isNegative == <span class="number">0</span> && str[i] == <span class="string">'-'</span>:</span><br><span class="line"> isNegative = <span class="number">-1</span></span><br><span class="line"> <span class="keyword">continue</span></span><br><span class="line"> <span class="keyword">case</span> !startNum && isNegative == <span class="number">0</span> && str[i] == <span class="string">'+'</span>:</span><br><span class="line"> isNegative = <span class="number">1</span></span><br><span class="line"> <span class="keyword">continue</span></span><br><span class="line"> <span class="keyword">case</span> str[i] < <span class="string">'0'</span> || str[i] > <span class="string">'9'</span>:</span><br><span class="line"> <span class="keyword">break</span> LOOP</span><br><span class="line"> <span class="keyword">default</span>:</span><br><span class="line"> <span class="keyword">if</span> isNegative == <span class="number">0</span> {</span><br><span class="line"> isNegative = <span class="number">1</span></span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">if</span> str[i] == <span class="string">'0'</span> && result == <span class="number">0</span> {</span><br><span class="line"> <span class="keyword">continue</span></span><br><span class="line"> }</span><br><span class="line"> startNum = <span class="literal">true</span></span><br><span class="line"> validLen++</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">if</span> validLen > <span class="number">10</span> || result > MaxPre ||</span><br><span class="line"> (result == MaxPre && (isNegative == <span class="number">1</span> && str[i] > <span class="string">'7'</span> && str[i] <= <span class="string">'9'</span> || isNegative == <span class="number">-1</span> && str[i] == <span class="string">'9'</span>)) {</span><br><span class="line"> <span class="keyword">if</span> isNegative == <span class="number">1</span> {</span><br><span class="line"> result = Max - <span class="number">1</span></span><br><span class="line"> <span class="keyword">break</span></span><br><span class="line"> } <span class="keyword">else</span> {</span><br><span class="line"> result = Max</span><br><span class="line"> <span class="keyword">break</span></span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> result = result*<span class="number">10</span> + (<span class="keyword">int</span>(str[i]) - <span class="string">'0'</span>)</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">if</span> isNegative != <span class="number">0</span> {</span><br><span class="line"> result = result * isNegative</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">return</span> result</span><br><span class="line">}</span><br></pre>
</td>
</tr>
</table>
</figure>
<h3 id="Review">
<a href="#Review" class="headerlink" title="Review"></a>Review</h3>
<p>英文阅读确实是短板，从简单的入手吧，顺便当作收藏资源</p>
<p>
<a href="https://blog.usejournal.com/staying-in-the-know-with-go-9bf719ccc3d1" target="_blank"
rel="external nofollow noopener noreferrer">关于go应该知道的一些知识</a>
</p>
<ul>
<li>
<a href="https://golangweekly.com/" target="_blank" rel="external nofollow noopener noreferrer">go周报</a>，大家都可以订阅一下，关于go的一些最新消息还有更新、文章、新闻等</li>
<li>
<a href="https://groups.google.com/forum/#!forum/golang-nuts" target="_blank" rel="external nofollow noopener noreferrer">go邮件列表1</a>，
<a href="https://groups.google.com/d/forum/golang-dev" target="_blank" rel="external nofollow noopener noreferrer">go开发者论坛</a>, 都是google自己家的，需要梯子，但是可以看到关于go的最新的讨论和发展</li>
<li>第三方论坛：
<a href="https://old.reddit.com/r/golang/" target="_blank" rel="external nofollow noopener noreferrer">reddit论坛</a>，</li>
<li>博客：
<a href="https://blog.feedspot.com/golang_blogs/" target="_blank" rel="external nofollow noopener noreferrer">号称top 20的golang博客的聚合</a>，看上去还不错</li>
<li>github 项目：
<a href="https://github.com/search?q=stars%3A%3E1000+language%3AGo+cache&type=Repositories"
target="_blank" rel="noopener">千星项目搜索</a>，千应该是受大家认可的项目了</li>
<li>GopherCon 开发者大会，这个看情况吧…</li>
</ul>
<h3 id="Tip">
<a href="#Tip" class="headerlink" title="Tip"></a>Tip</h3>
<p>刚好在写上面leetcode题的时候发现，go的字符型还是挺有意思的，当我按照下标去访问字符串元素的时候，得到的竟然是
<code>uint8</code>，同理，当定义一个字符的时候，其实也是使用了
<code>uint8</code>,其值就是对应的ascii码值，这样可以直接进行
<code>+-</code>操作，同时比较也很方便。</p>
<figure class="highlight go">
<table>
<tr>
<td class="gutter">
<pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre>
</td>
<td class="code">
<pre><span class="line"><span class="function"><span class="keyword">func</span> <span class="title">main</span><span class="params">()</span></span> {</span><br><span class="line"> s := <span class="string">"abcd"</span></span><br><span class="line"> tt := reflect.TypeOf(s[<span class="number">0</span>])</span><br><span class="line"> vv := reflect.ValueOf(s[<span class="number">0</span>])</span><br><span class="line"> fmt.Printf(<span class="string">"type is: %v\n"</span>, tt)</span><br><span class="line"> fmt.Printf(<span class="string">"value is: %v\n"</span>, vv)</span><br><span class="line">}</span><br><span class="line"><span class="comment">// type is: uint8</span></span><br><span class="line"><span class="comment">// value is: 97</span></span><br></pre>
</td>
</tr>
</table>
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<h3 id="Share">
<a href="#Share" class="headerlink" title="Share"></a>Share</h3>
<p>先分享一篇别人现成的吧</p>
<p>
<a href="https://mp.weixin.qq.com/s/H6r3EozpiRt5eY-3N_LUjw" target="_blank" rel="external nofollow noopener noreferrer">Go高级实践：反射3定律</a>
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