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<h3 id="玩一下swoole的websocket"><a href="#玩一下swoole的websocket" class="headerlink" title="玩一下swoole的websocket"></a>玩一下swoole的websocket</h3><p>WebSocket是HTML5开始提供的一种在单个<a href="https://zh.wikipedia.org/wiki/TCP" target="_blank" rel="noopener">TCP</a>连接上进行<a href="https://zh.wikipedia.org/wiki/%E5%85%A8%E9%9B%99%E5%B7%A5" target="_blank" rel="noopener">全双工</a>通讯的协议。WebSocket通信协议于2011年被<a href="https://zh.wikipedia.org/wiki/Internet_Engineering_Task_Force" target="_blank" rel="noopener">IETF</a>定为标准RFC 6455，WebSocketAPI被W3C定为标准。<br>,在web私信，im等应用较多。背景和优缺点可以参看<a href="https://zh.wikipedia.org/wiki/WebSocket" target="_blank" rel="noopener">wiki</a>。</p>
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<h3 id="环境准备"><a href="#环境准备" class="headerlink" title="环境准备"></a>环境准备</h3><p>因为swoole官方还不支持windows，所以需要装下linux,之前都是用ubuntu，<br>这次就试一下centos7，还是满好看的，虽然虚拟机会默认最小安装，需要在安装<br>时自己选择带gnome的，当然最小安装也是可以的，只是最后需要改下防火墙。<br>然后是装下PHP，Nginx什么的，我是用<a href="https://oneinstack.com/" target="_blank" rel="noopener">Oneinstack</a>，可以按需安装<br>给做这个的大大点个赞。</p>
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<p><strong>Invert a binary tree</strong></p>
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<pre><code> 4
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/ \
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2 7
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/ \ / \
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1 3 6 9</code></pre><p>to</p>
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<pre><code> 4
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/ \
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7 2
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/ \ / \
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9 6 3 1</code></pre><p><strong>Trivia:</strong><br>This problem was inspired by <a href="https://twitter.com/mxcl/status/608682016205344768" target="_blank" rel="noopener">this original tweet</a> by <a href="https://twitter.com/mxcl" target="_blank" rel="noopener">Max Howell</a>:</p>
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<p>Google: 90% of our engineers use the software you wrote (Homebrew),<br>but you can’t invert a binary tree on a whiteboard so fuck off. </p>
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<figure class="highlight c++"><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></pre></td><td class="code"><pre><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * Definition for a binary tree node.</span></span><br><span class="line"><span class="comment"> * struct TreeNode {</span></span><br><span class="line"><span class="comment"> * int val;</span></span><br><span class="line"><span class="comment"> * TreeNode *left;</span></span><br><span class="line"><span class="comment"> * TreeNode *right;</span></span><br><span class="line"><span class="comment"> * TreeNode(int x) : val(x), left(NULL), right(NULL) {}</span></span><br><span class="line"><span class="comment"> * };</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">Solution</span> {</span></span><br><span class="line"><span class="keyword">public</span>:</span><br><span class="line"> <span class="function">TreeNode* <span class="title">invertTree</span><span class="params">(TreeNode* root)</span> </span>{</span><br><span class="line"> <span class="keyword">if</span>(root == <span class="literal">NULL</span>) <span class="keyword">return</span> root;</span><br><span class="line"> TreeNode* temp;</span><br><span class="line"> temp = invertTree(root->left);</span><br><span class="line"> root->left = invertTree(root->right);</span><br><span class="line"> root->right = temp;</span><br><span class="line"> <span class="keyword">return</span> root;</span><br><span class="line"> }</span><br><span class="line">};</span><br></pre></td></tr></table></figure>
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<h3 id="problem"><a href="#problem" class="headerlink" title="problem"></a>problem</h3><p>You are given two linked lists representing two non-negative numbers. The digits are stored in reverse order and each of their nodes contain a single digit. Add the two numbers and return it as a linked list.</p>
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<p><strong>Input</strong>:<code>(2 -> 4 -> 3) + (5 -> 6 -> 4)</code><br><strong>Output</strong>: <code>7 -> 0 -> 8</code></p>
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<p><strong>分析（不用英文装逼了）</strong><br>这个代码是抄来的，<a href="https://github.com/haoel/leetcode" target="_blank" rel="noopener">链接</a>原作是这位大大。</p>
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<h3 id="Reverse-Integer"><a href="#Reverse-Integer" class="headerlink" title="Reverse Integer"></a><a href="https://leetcode.com/problems/reverse-integer/" target="_blank" rel="noopener">Reverse Integer</a></h3><h4 id="Reverse-digits-of-an-integer"><a href="#Reverse-digits-of-an-integer" class="headerlink" title="Reverse digits of an integer."></a>Reverse digits of an integer.</h4><p>Example1: x = 123, return 321<br>Example2: x = -123, return -321</p>
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<h3 id="Reverse-Bits"><a href="#Reverse-Bits" class="headerlink" title="Reverse Bits "></a><a href="https://leetcode.com/problems/reverse-bits/" target="_blank" rel="noopener">Reverse Bits </a></h3><h4 id="Reverse-bits-of-a-given-32-bits-unsigned-integer"><a href="#Reverse-bits-of-a-given-32-bits-unsigned-integer" class="headerlink" title="Reverse bits of a given 32 bits unsigned integer."></a>Reverse bits of a given 32 bits unsigned integer.</h4><p>For example, given input 43261596 (represented in binary as 00000010100101000001111010011100), return 964176192 (represented in binary as 00111001011110000010100101000000).</p>
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<h3 id="Number-of-1-Bits"><a href="#Number-of-1-Bits" class="headerlink" title="Number of 1 Bits "></a><a href="https://leetcode.com/problems/number-of-1-bits/" target="_blank" rel="noopener">Number of 1 Bits </a></h3><h4 id="Write-a-function-that-takes-an-unsigned-integer-and-returns-the-number-of-’1’-bits-it-has-also-known-as-the-Hamming-weight-For-example-the-32-bit-integer-‘11’-has-binary-representation-00000000000000000000000000001011-so-the-function-should-return-3"><a href="#Write-a-function-that-takes-an-unsigned-integer-and-returns-the-number-of-’1’-bits-it-has-also-known-as-the-Hamming-weight-For-example-the-32-bit-integer-‘11’-has-binary-representation-00000000000000000000000000001011-so-the-function-should-return-3" class="headerlink" title="Write a function that takes an unsigned integer and returns the number of ’1’ bits it has (also known as the Hamming weight). For example, the 32-bit integer ‘11’ has binary representation 00000000000000000000000000001011, so the function should return 3."></a>Write a function that takes an unsigned integer and returns the number of ’1’ bits it has (also known as the Hamming weight). For example, the 32-bit integer ‘11’ has binary representation <code>00000000000000000000000000001011</code>, so the function should return 3.</h4>
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<h3 id="Pcre"><a href="#Pcre" class="headerlink" title="Pcre"></a><a href="http://www.pcre.org/" target="_blank" rel="noopener">Pcre</a></h3><blockquote>
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<p>Perl Compatible Regular Expressions (PCRE) is a regular<br> expression C library inspired by the regular expression<br> capabilities in the Perl programming language, written<br> by Philip Hazel, starting in summer 1997.</p>
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<p>因为最近工作内容的一部分需要做字符串的识别处理，所以就顺便用上了之前在PHP中用过的正则，在C/C++中本身不包含正则库，这里使用的pcre，对MFC开发，在<a href="http://www.psyon.org/projects/pcre-win32/index.php" target="_blank" rel="noopener">这里</a>提供了静态链接库，在引入lib跟.h文件后即可使用。</p>
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<h3 id="problem"><a href="#problem" class="headerlink" title="problem"></a>problem</h3><p>Given an array of integers, find two numbers such that they add up to a specific target number.</p>
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