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- <p>数组,结构体,二叉树</p>
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- <p>有时候我们会遇到一些大规模的区间查找和区间修改问题,比如让你维护一个 <span class="math inline">\(10^5\)</span> 长度的数列,要求操作有区间求和、区间加(区间每个数加上一个值),让你在一秒内完成 <span class="math inline">\(10^5\)</span> 次操作。 暴力是肯定不行的,数据范围太大,会超时。 所以我们就有一种专门解决大范围区间修改查询的数据结构:线段树。</p>
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- <p>引自:《信息学奥赛之-数学一本通》 揍是这样: <span class="math display">\[\operatorname{F}(n)=\dfrac{\sqrt{5}}{5}\cdot\left[\left(1+\sqrt{5}\right)^n-\left(1-\sqrt{5}\right)^n\right]\]</span> 代码揍这么简单: <figure class="highlight cpp"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">int</span> <span class="title">ferbo</span><span class="params">(<span class="keyword">int</span> n)</span></span>{</span><br><span class="line"> <span class="keyword">return</span> (<span class="built_in">sqrt</span>(<span class="number">5</span>)/<span class="number">5</span>)*(<span class="built_in">pow</span>((<span class="number">1</span>+<span class="built_in">sqrt</span>(<span class="number">5</span>))/<span class="number">2</span>,n)-<span class="built_in">pow</span>((<span class="number">1</span>-<span class="built_in">sqrt</span>(<span class="number">5</span>))/<span class="number">2</span>,n));</span><br><span class="line">}</span><br></pre></td></tr></table></figure> 要是再加个快速幂就更棒了(够快了,懒得写)</p>
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- <h3 id="前置知识">前置知识</h3>
- <p>存图方式(<a href="http://baidu.physton.com/?q=邻接表" target="_blank" rel="noopener" title="简单">邻接表</a>,<a href="http://baidu.physton.com/?q=邻接矩阵" target="_blank" rel="noopener" title="都太简单了">邻接矩阵</a>),图的遍历(<a href="http://baidu.physton.com/?q=dfs" target="_blank" rel="noopener" title="简单">dfs</a>,<a href="http://baidu.physton.com/?q=bfs" target="_blank" rel="noopener" title="简单">bfs</a>)</p>
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- <p>我们举个例子吧: 有一个毒瘤水管工,他会造水管,有一天他造了一个水管网络,就像一个图。其中有一个点只有出边,就是起点,还有一个点只有入边,是终点。 点之间有一些管子,这些管子都有单位时间内的容量,现在毒瘤水管工想知道,他的管子在<strong>单位时间内</strong>在起点终点之间最多能流多少水。
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- <p>存图方式(<a href="http://baidu.physton.com/?q=邻接表" target="_blank" rel="noopener" title="简单">邻接表</a>,<a href="http://baidu.physton.com/?q=邻接矩阵" target="_blank" rel="noopener" title="都太简单了,没有一个打得过的">邻接矩阵</a>),<a href="https://schtonn.github.io/2020/03/01/union-find" target="_blank" rel="noopener">并查集</a>。 不会的快进入链接学习吧!</p>
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- <p>生成树,就是从一个图中选中<span class="math inline">\(n-1\)</span>条边,使得这些边构成一棵树,并包含图中的所有节点。 最小生成树,就是找到一种生成树,使得这个生成树的边权和最小。
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- <p>哈哈,简单到爆,没有。</p>
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- <p>并查集是一种快到爆炸的集合算法,可以进行两项基本操作:合并两个集合(并)、查询两个参数是否在一个集合内(查)。这也是它名字的由来。
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