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<a class="article-title" href="/2021/11/25/%E9%80%92%E5%BD%92%E4%B8%8E%E5%88%86%E6%B2%BB/">递归与分治</a>
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<p>#<div id="no1">递归与分治</div><br>##1.算法总体思想<br> (1)将要求解的较大规模的问题分割成k个更小规模的子问题<br> (2)对这k个子问题分别求解。如果子问题的规模仍然不够小，则再划分为k个子问题，如此递归的进行下去，直到问题规模足够小，很容易求出其解为止。<br> (3)对这k个子问题分别求解。如果子问题的规模仍然不够小，则再划分为k个子问题，如此递归的进行下去，直到问题规模足够小，很容易求出其解为止。<br> (4)将求出的小规模的问题的解合并为一个更大规模的问题的解，自底向上逐步求出原来问题的解。<br> (5)将求出的小规模的问题的解合并为一个更大规模的问题的解，自底向上逐步求出原来问题的解。</p>
<p>##2.递归的概念<br> (1)直接或间接地调用自身的算法称为<strong>递归算法</strong>。用函数自身给出定义的函数称为<strong>递归函数</strong>。<br> (2)由分治法产生的子问题往往是原问题的较小模式，这就为使用递归技术提供了方便。在这种情况下，反复应用分治手段，可以使子问题与原问题类型一致而其规模却不断缩小，最终使子问题缩小到很容易直接求出其解。这自然导致递归过程的产生。<br> (3)分治与递归像一对孪生兄弟，经常同时应用在算法设计中，并由此产生许多高效算法。<br> (4)<strong>边界条件</strong>与<strong>递归方程</strong>是递归函数的两个要素，递归函数只有具备了这两个要素才能在<strong>有限次计算</strong>后得出结果</p>
<p>##3.常见题型<br>###<strong>Fibonacci数列</strong></p>
<figure class="highlight plaintext"><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></pre></td><td class="code"><pre><span class="line">int fibonacci(int n){</span><br><span class="line"> if(n<=1>) return 1;</span><br><span class="line"> return fibonacci(n-1)+fibonacci(n-2);</span><br><span class="line"> }</span><br></pre></td></tr></table></figure>
<blockquote>
<p>leetcode #509 斐波那契数<br>leetcode #1137 第 N 个泰波那契数<br>leetcode #70 爬楼梯<br>###<strong>Ackerman函数</strong></p>
</blockquote>
<!-- TODO题目还没有写 -->
<p> 当一个函数及它的一个变量是由函数自身定义时，称这个函数<strong>双递归函数</strong><br> A(n,m)的自变量m的每一个值都定义了一个单变量函数：根据m的不同,表达式有所不同。<br>###<strong>排列问题</strong><br> 设计一个递归算法生成n个元素{$r_1,r_2……,r_n$}的全排列。<br> 设R={$r_1,r_2……,r_n$}是呀进行排列的n个元素，$R_i$=R-{$r_i$}。<br> 集合X中元素的全排列记为perm(X)。<br> ($r_i$)perm(X)表示在全排列perm(X)的每一个排列前加上前缀得到的排列。</p>
<figure class="highlight plaintext"><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></pre></td><td class="code"><pre><span class="line">template<class Type></span><br><span class="line"> void Perm(Type list[],int k,int m)</span><br><span class="line"> {</span><br><span class="line"> if(k==m){</span><br><span class="line"> for(int i=0;i<=m;i++)</span><br><span class="line"> cout<<list[i];</span><br><span class="line"> cout<<endl;</span><br><span class="line"> }else{</span><br><span class="line"> for(int i=k;i<=m;i++){</span><br><span class="line"> Swap(list[k],list[i]);</span><br><span class="line"> Perm(list,k+1,m);</span><br><span class="line"> Swap(list[k],list[i]);</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> }</span><br></pre></td></tr></table></figure>
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<h2 id="我的博客主要包括学习算法和游戏技术"><a href="#我的博客主要包括学习算法和游戏技术" class="headerlink" title="我的博客主要包括学习算法和游戏技术"></a>我的博客主要包括学习算法和游戏技术</h2>
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<a class="article-title" href="/2021/11/24/hello-world/">Hello World</a>
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<p>Welcome to <a target="_blank" rel="noopener" href="https://hexo.io/">Hexo</a>! This is your very first post. Check <a target="_blank" rel="noopener" href="https://hexo.io/docs/">documentation</a> for more info. If you get any problems when using Hexo, you can find the answer in <a target="_blank" rel="noopener" href="https://hexo.io/docs/troubleshooting.html">troubleshooting</a> or you can ask me on <a target="_blank" rel="noopener" href="https://github.com/hexojs/hexo/issues">GitHub</a>.</p>
<h2 id="Quick-Start"><a href="#Quick-Start" class="headerlink" title="Quick Start"></a>Quick Start</h2><h3 id="Create-a-new-post"><a href="#Create-a-new-post" class="headerlink" title="Create a new post"></a>Create a new post</h3><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">$ hexo new <span class="string">"My New Post"</span></span><br></pre></td></tr></table></figure>
<p>More info: <a target="_blank" rel="noopener" href="https://hexo.io/docs/writing.html">Writing</a></p>
<h3 id="Run-server"><a href="#Run-server" class="headerlink" title="Run server"></a>Run server</h3><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">$ hexo server</span><br></pre></td></tr></table></figure>
<p>More info: <a target="_blank" rel="noopener" href="https://hexo.io/docs/server.html">Server</a></p>
<h3 id="Generate-static-files"><a href="#Generate-static-files" class="headerlink" title="Generate static files"></a>Generate static files</h3><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">$ hexo generate</span><br></pre></td></tr></table></figure>
<p>More info: <a target="_blank" rel="noopener" href="https://hexo.io/docs/generating.html">Generating</a></p>
<h3 id="Deploy-to-remote-sites"><a href="#Deploy-to-remote-sites" class="headerlink" title="Deploy to remote sites"></a>Deploy to remote sites</h3><figure class="highlight bash"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">$ hexo deploy</span><br></pre></td></tr></table></figure>
<p>More info: <a target="_blank" rel="noopener" href="https://hexo.io/docs/one-command-deployment.html">Deployment</a></p>
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缺失模块。<br/>1、请确保node版本大于6.2<br/>2、在博客根目录（注意不是yilia根目录）执行以下命令：<br/> npm i hexo-generator-json-content --save<br/><br/>
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<div class="aboutme-wrap" id="js-aboutme">很惭愧<br><br>只做了一点微小的工作<br>谢谢大家</div>
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