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<h1 id="LeetCode-1838题"><a href="#LeetCode-1838题" class="headerlink" title="LeetCode 1838题"></a>LeetCode 1838题</h1><p>原题链接： <a target="_blank" rel="noopener" href="https://leetcode.com/problems/frequency-of-the-most-frequent-element/" title="Frequency of the Most Frequent Element">https://leetcode.com/problems/frequency-of-the-most-frequent-element/</a></p>
<p>关键点：<br>1、最后的最频繁出现的元素一定在数组中，如果不在数组中，也可以通过整体少increase几次的方式，回到数组元素中。<br>2、最后的结果元素在最后加工前元素中，是最大的。<br>3、以上两点可以得到，将数组排序后，元素一定在数组的一个窗口内，不可能窗口内有元素被跳过。</p>
<p>综上所述，代码如下</p>
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<p><strong>题目如下</strong></p>
<p><a target="_blank" rel="noopener" href="https://leetcode.com/problems/magnetic-force-between-two-balls/">https://leetcode.com/problems/magnetic-force-between-two-balls/</a></p>
<p>这里是按照二分查找数据的原理处理的，原理如下：</p>
<p>一个数组，下标为最小的距离，数组元素为最多可以容纳的球的数量。</p>
<p>这个数组单调递增。不过会有重复元素的出现，比如 n~m的距离，容纳的球的数量都是D个。这种情况下，m即为结果。</p>
<p>解题思路如下：</p>
<p><a target="_blank" rel="noopener" href="https://leetcode.com/problems/magnetic-force-between-two-balls/discuss/794070/PythonC%2B%2B-Binary-search-solution-with-explanation-and-similar-questions">https://leetcode.com/problems/magnetic-force-between-two-balls/discuss/794070/PythonC%2B%2B-Binary-search-solution-with-explanation-and-similar-questions</a></p>
<p>之所以是用</p>
<pre><code>int mid = r - (r - l) / 2;
</code></pre>
<p>来查找中间位置，是因为需要通过这个找到最右边的m。</p>
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<p><strong>父子进程对监听socket的处理可以分为以下两种</strong></p>
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<h1 id="1-redis主从同步概述"><a href="#1-redis主从同步概述" class="headerlink" title="1. redis主从同步概述"></a>1. redis主从同步概述</h1><p>redis的主从同步与mysql不一样，redis都是通过同步命令的方式进行的。</p>
<p>具体的同步方式分为两种，全量同步、部分重同步</p>
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<h1 id="1、binlog文件"><a href="#1、binlog文件" class="headerlink" title="1、binlog文件"></a>1、binlog文件</h1><p>Binlog的日志格式可以在命令行中设置</p>
<pre><code>show variables like '%log%'; //要重新登入一次才会看到该变量生效
set global binlog_format='row'/'statement'/'mixed'
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<p>binlog有三种格式：Statement, Row和Mixed.</p>
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<h1 id="1、socket与缓存区"><a href="#1、socket与缓存区" class="headerlink" title="1、socket与缓存区"></a>1、socket与缓存区</h1><p><a target="_blank" rel="noopener" href="http://c.biancheng.net/cpp/html/3040.html">http://c.biancheng.net/cpp/html/3040.html</a></p>
<p>epoll的ET触发并非缓存区可读可写，而是有新的网络IO事件。如果没有完全读取完毕而返回导致缓存区一直有数据可读。则只能等到下一次有网络IO时间的时候才能读取到。</p>
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<h1 id="redis的非阻塞网络模型"><a href="#redis的非阻塞网络模型" class="headerlink" title="redis的非阻塞网络模型"></a>redis的非阻塞网络模型</h1><h2 id="建立连接时："><a href="#建立连接时：" class="headerlink" title="建立连接时："></a>建立连接时：</h2><pre><code> // 非阻塞
anetNonBlock(NULL,fd);
// 禁用 Nagle 算法
anetEnableTcpNoDelay(NULL,fd);
// 设置 keep alive
if (server.tcpkeepalive)
anetKeepAlive(NULL,fd,server.tcpkeepalive);
// 绑定读事件到事件 loop （开始接收命令请求）
if (aeCreateFileEvent(server.el,fd,AE_READABLE,
readQueryFromClient, c) == AE_ERR)
{
close(fd);
zfree(c);
return NULL;
}
</code></pre>
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<p>C++默认生成4个成员函数.</p>
<p>默认构造函数(default constructor), 析构函数(destructor), 复制构造函数(copy constructor), 赋值运算符函数(assignment);</p>
<p>C++11新增两个：</p>
<p>move构造函数（右值引用构造函数）<br>move赋值函数</p>
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<p>如下图所示：<br>当没有使用转移字符的时候，\n的长度为1，使用strchr是可以找到\n的</p>
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<p>set：</p>
<p>当只有少量数字的时候，set是基于intset实现的。当数据量大了，或者有字符存在的时候，基于dict实现，其中value为null</p>
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